ruby memo

<br />to_i(9)<br />gets<br />File.read("cc.txt")<br /><br />fh = File.new("cc.txt", "w")<br />fh.puts f<br />fh.close<br /><br />require just once<br />load will force reload<br /><br />ruby -l demo.rb<br />ruby-1.6.8 -ve ...............<br />sudo gem updateh<br /><br />sort_by<br />sort<br />-------------------------------------------------------------------------------<br />application layout no effect<br /><br />apache config set the request go the where<br />Document /home/lake/rails_app/iwakela/public<br />public have a .htaccess will define which dispatch will be used<br /><br />controller could use CGI and some data in form => use params method<br /> session => use session method<br /><br />玩弄YAML "string".to_yaml<br />YAML.load(<yaml_type>)<br />XML<br />JSON<br /><br />lambda block,<br />sort_proc = lambda{|e| [e................]}<br />呼叫 &sort_proc<br /><br />ruby -e 'p Dir["*.rb"]'<br /><br />puts "ccc" #return nil<br /><br />-------------------------------------------------------------------------------<br /> Object.new.methods.sort<br /><br />>> u.send(name)<br />NameError: undefined local variable or method `name' for #<Object:0xb7d2d9a0><br /> from (irb):10<br />>> u.send(:name)<br />=> "早鳥"<br />>> u.send("name")<br />=> "早鳥"<br /><br />>> u.respond_to?(name)<br />NameError: undefined local variable or method `name' for #<Object:0xb7d2d9a0><br /> from (irb):12<br />>> u.respond_to?(:name)<br />=> true<br />>> u.respond_to?("name")<br />=> true<br /><br /><br />ruby's variable would not take the object's content directly , they just take the reference<br /><br />new initialize<br />superclass<br /><br />------------------------------<br />Singleton -> C -> M -> C -> M<br /><br />super<br /><br />------------------------------<br />instance method, self be known in run time<br /><br />singleton in particulr object(could be class object, too)<br /><br />class function is singleton function, too<br />self.x = C.x<br />singletion give us a chance to add new method in run time<br /><br />some situation dot could not be ingored, self.venue = blahblah<br /><br />$0 is the file name be executed<br /><br />inner method could not take the outer scope variable<br />class C<br /> aa = 1<br /> def m<br /> p aa<br /> end<br /><br /> p aa<br />end<br /><br /><br />bareword, private method, <br />def aa<br /> p 'aaa'<br />end<br />aa<br /><br />,and puts, print are either<br />-----------------------------------<br /><br />whem, ===<br /><br />yield, block<br />[Q]: Why need code block <br />[A]: We could call the same function, but we could use different block to achieve different goal<br />yield, block both skills for using function like parameter<br /><br />rescue Errno::ENOENT => e<br /><br />-----------------------------------------<br />strip : lose the outer spaces<br />chop : remove last character<br />chomp : remove training newline<br /><br />eql? is more like ==<br />equal? test two object is the same or not<br /><br />:"Symbol need the quote if it has spaces"<br /><br />--------------------------------------------<br />Array.new(3, "abc") would be all the same object<br />Array.new(3){"abc"} that would be different objects<br /><br />add<br />unshift[.........]push<br /><br />remove<br />shift[............]pull return the element be removed<br /><br />[Q]: concat push, what is the different? <br />[A]: concat would sort, push would just add to the array tailer<br /><br />replcae is change the content of the original object<br /><br />>> [1,2,3].zip([4,5,6])<br />=> [[1, 4], [2, 5], [3, 6]]<br />>> [1,2,3].zip([4,5,6]).flatten<br />=> [1, 4, 2, 5, 3, 6]<br />>> [1,2,3].zip([4,5,6]).flatten.join<br />=> "142536"<br />>> [1,2,3].zip([4,5,6]).flatten.join(", ")<br />=> "1, 4, 2, 5, 3, 6"<br />>> [1,2,3].zip([6,2,3]).flatten.uniq<br />=> [1, 6, 2, 3]<br /><br />-----------------------------------------------------<br />find<br />find_all (select)<br />include?<br />reject<br /><br />>> User.find(:all, :conditions => "name like '%'").map(&:name)<br />=> ["早鳥", "flake", "flak", "lakela", "sandy", "lakela1", "什麼鬼什麼鬼什麼鬼啊啦", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br />>> User.find(:all, :conditions => "name like 'lake'").map(&:name)<br />=> []<br />>> User.find(:all, :conditions => "name like 'lake%'").map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all, :conditions => "name like 'lak%'").map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all, :conditions => "name like '%lak%'").map(&:name)<br />=> ["flake", "flak", "lakela", "lakela1", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br /><br />>> User.find(:all).find_all{|u| /^lake/.match(u.name)}.map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all).find_all{|u| /lake/.match(u.name)}.map(&:name)<br />=> ["flake", "lakela", "lakela1", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br /><br /><br /><br />>> h = {"a" => 1, "b" => 2, "c" => 3}<br />=> {"a"=>1, "b"=>2, "c"=>3}<br />>> h.values_at("a", "b")<br />=> [1, 2]<br />>> h["d"]<br />=> nil<br />>> h.fetch("d")<br />IndexError: key not found<br /> from (irb):17:in `fetch'<br /> from (irb):17<br /> from :0<br /><br /><br />Hash.new{block} block would be executed when access key does not exist<br />>> h = Hash.new{|hash, key| hash[key] = key }<br />=> {}<br />>> h["lake"]<br />=> "lake"<br />>> h<br />=> {"lake"=>"lake"}<br /><br />>> h<br />=> {"flake"=>"flake", "lake"=>"lake"}<br />>> h2<br />=> {"lake"=>"lakelake"}<br />>> h3 = h.merge(h2)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br /><br />>> h3.invert<br />=> {"lakelake"=>"lake", "flake"=>"flake"}<br /><br />>> h3.replace(h3.invert)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br />>> h3.clear<br />=> {}<br />>> h3<br />=> {}<br /><br />>> h4 = h.merge(h2)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br />>> h4.keys<br />=> ["flake", "lake"]<br />>> h4.values<br />=> ["flake", "lakelake"]<br /><br />>> { 1 => "a", 2 => "b"}.find_all{|k, v| k%2 == 0}<br />=> [[2, "b"]]<br />become array<br /><br />>> { 1 => "a", 2 => "b"}.map{|k, v| [k*2, v.upcase]}<br />=> [[2, "A"], [4, "B"]]<br /><br />>> h.has_key?(1)<br />=> true<br />>> h.has_value?(1)<br />=> false<br /><br /><br />sort<br /><=><br /><br />>> User.find(:all).map(&:name).sort<br />=> ["flak", "flake", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "lakela", "lakela1", "sandy", "什麼鬼什麼鬼 什麼鬼啊啦", "早鳥"]<br />>> User.find(:all).map(&:name).sort do |a,b|; a.size <=> b.size;end<br />=> ["flak", "flake", "sandy", "lakela", "早鳥", "lakela1", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "什麼 鬼什麼鬼什麼鬼啊啦"]<br /><br />We could overwrite the <=> by a block <br /><br />>> User.find(:all).map(&:name).sort_by do |a|; a.size;end<br />=> ["flak", "flake", "sandy", "lakela", "早鳥", "lakela1", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "什麼 鬼什麼鬼什麼鬼啊啦"]<br /><br /><br />-------------------------------------------<br />>> 'abc def' =~ /a/<br />=> 0<br />>> /a/ =~ 'abc def'<br />=> 0<br />>> /g/ =~ 'abc def'<br />=> nil<br />>> 'abc def' =~ /g/<br />=> nil<br /><br />Regexp stay in left or right is the same<br />if match, it would return the location of string, or return nil<br />>> /a/.match('abc def')<br />=> #<MatchData:0xb75f6da8><br />>> ('abc def').match(/a/)<br />=> #<MatchData:0xb75f1128><br /><br />>> m = 'ABClake.ilakela@gmail.com'.match(/([_a-z0-9-]+)(\.[_a-z0-9-]+)*(\+[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/)<br />=> #<MatchData:0xb759f1ac><br />>> m[0]<br />=> "lake.ilakela@gmail.com"<br />>> m[1]<br />=> "lake"<br />>> m[2]<br />=> ".ilakela"<br />>> m.captures[0]<br />=> "lake"<br />>> m.captures[1]<br />=> ".ilakela"<br /><br />$& match 到的 m[0]<br />$` match到 前面的string m.pre_match<br />$' match到 後面的string m.post_match<br />$1 $2 第1 ,2個() 裡面的東西 m[1], m[2]<br /><br />.>> m.begin(1) the first capture begin at location<br />=> 3<br />>> m.end(1)<br />=> 7<br /><br /><br />>> m = 'abc!def!ika!'.match(/.+!/)<br />=> #<MatchData:0xb753d614><br />>> m[0]<br />=> "abc!def!ika!"<br />>> m = 'abc!def!ika!'.match(/.+?!/)<br />=> #<MatchData:0xb753944c><br />>> m[0]<br />=> "abc!"<br /><br />add ? after +<br /><br />>> m = 'abc!def!ikdda!'.match(/\w{4}+!/)<br />=> #<MatchData:0xb7529344><br />>> m[0]<br /><br />>> m = 'abc!def!ikdda!'.match(/.{4,5}!/)<br />=> #<MatchData:0xb74f150c><br />>> m[0]<br />=> "c!def!"<br /><br />>> m = 'a3b4c5'.match(/([a-z]\d){2}/)<br />=> #<MatchData:0xb74c3468><br />>> m[0]<br />=> "a3b4"<br /><br /><br />>> m = 'abc def. gga'.match(/[a-z]+(?=\.)/)<br />=> #<MatchData:0xb74bcf3c><br />>> m[0]<br />=> "def"<br />>> m = 'abc def. gga'.match(/[a-z]+(?!\s)/)<br />=> #<MatchData:0xb74ac2f4><br />>> m[0]<br />=> "ab"<br /><br /><br />>> "a,b;c#d".split(/,|;|#/)<br />=> ["a", "b", "c", "d"]<br />>> "a,b;c#d".split(/,|;|#/, 2)<br />=> ["a", "b;c#d"]<br />>> "a,b;c#d".split(/,|;|#/, 3)<br />=> ["a", "b", "c#d"]<br /><br /><br />>> "a,bd,gre,gef,a".sub(/\w{3}(?=,)/) {|s| s.upcase}<br />=> "a,bd,GRE,gef,a"<br /><br />>> "a,bd,greGEF,a".sub(/(\w{3})([A-Z]{3})/, '\2\1') <br />=> "a,bd,GEFgre,a"<br /><br /><br /><br />>> ["ab", "bcd", "efg"].grep(/\w{3}/) {|w| w.upcase}<br />=> ["BCD", "EFG"]<br /><br />>> ["ab", "bcd", "efg"].select {|w| p w.upcase if w.match(/\w{3}/) }<br />"BCD"<br />"EFG"<br />=> []<br />>> ["ab", "bcd", "efg"].select {|w| w.upcase if w.match(/\w{3}/) }<br />=> ["bcd", "efg"]<br /><br />>> ["ab", "bcd", "efg"].map {|w| w.upcase if w.match(/\w{3}/) }<br />=> [nil, "BCD", "EFG"]<br /><br /><br />>> ["1","2",3].grep(/\d/)<br />=> ["1", "2"]<br /><br />--------------------------------<br />Proc.new is different from lambde in return scope<br /><br />const_set<br /><br /> alias_method :old_destroy, :destroy<br /><br /> def destroy(r)<br /> if r<br /> old_destroy<br /> else<br /> update_attribute(:removed_at, Time.now) if !removed_at<br /> end<br /> end<br /><br />----------------------------------<br />class Work < ActiveRecord::Base<br /> belongs_to :composer<br /><br /> def composer<br /> Composer.find(composer_id)<br /> end<br />end<br /><br /><br /><br />Returns a copy of self with all nil elements removed.<br /><br /> [ "a", nil, "b", nil, "c", nil ].compact<br /> #=> [ "a", "b", "c" ]<br /><br />-------------------------------------<br />Association callbacks, before_add, after_add, before_remove and after_remove<br /><br /> module FindOrCreateByNameExtension<br /> def find_or_create_by_name(name)<br /> first_name, last_name = name.split(" ", 2)<br /> find_or_create_by_first_name_and_last_name(first_name, last_name)<br /> end<br /> end<br /><br /> class Account < ActiveRecord::Base<br /> has_many :people, :extend => FindOrCreateByNameExtension<br /> end<br /><br /> class Company < ActiveRecord::Base<br /> has_many :people, :extend => FindOrCreateByNameExtension<br /> end<br /><br /><br /> class Account < ActiveRecord::Base<br /> has_many :people, :extend => [FindOrCreateByNameExtension, FindRecentExtension]<br /> end<br /><br /><br />Post.find(:all, :include => [ :author, :comments ])<br />Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ])<br />Post.find(:all, :include => [ :author, :comments ], :conditions => ['comments.approved = ?', true])<br />

ruby memo

<br />to_i(9)<br />gets<br />File.read("cc.txt")<br /><br />fh = File.new("cc.txt", "w")<br />fh.puts f<br />fh.close<br /><br />require just once<br />load will force reload<br /><br />ruby -l demo.rb<br />ruby-1.6.8 -ve ...............<br />sudo gem updateh<br /><br />sort_by<br />sort<br />-------------------------------------------------------------------------------<br />application layout no effect<br /><br />apache config set the request go the where<br />Document /home/lake/rails_app/iwakela/public<br />public have a .htaccess will define which dispatch will be used<br /><br />controller could use CGI and some data in form => use params method<br /> session => use session method<br /><br />玩弄YAML "string".to_yaml<br />YAML.load(<yaml_type>)<br />XML<br />JSON<br /><br />lambda block,<br />sort_proc = lambda{|e| [e................]}<br />呼叫 &sort_proc<br /><br />ruby -e 'p Dir["*.rb"]'<br /><br />puts "ccc" #return nil<br /><br />-------------------------------------------------------------------------------<br /> Object.new.methods.sort<br /><br />>> u.send(name)<br />NameError: undefined local variable or method `name' for #<Object:0xb7d2d9a0><br /> from (irb):10<br />>> u.send(:name)<br />=> "早鳥"<br />>> u.send("name")<br />=> "早鳥"<br /><br />>> u.respond_to?(name)<br />NameError: undefined local variable or method `name' for #<Object:0xb7d2d9a0><br /> from (irb):12<br />>> u.respond_to?(:name)<br />=> true<br />>> u.respond_to?("name")<br />=> true<br /><br /><br />ruby's variable would not take the object's content directly , they just take the reference<br /><br />new initialize<br />superclass<br /><br />------------------------------<br />Singleton -> C -> M -> C -> M<br /><br />super<br /><br />------------------------------<br />instance method, self be known in run time<br /><br />singleton in particulr object(could be class object, too)<br /><br />class function is singleton function, too<br />self.x = C.x<br />singletion give us a chance to add new method in run time<br /><br />some situation dot could not be ingored, self.venue = blahblah<br /><br />$0 is the file name be executed<br /><br />inner method could not take the outer scope variable<br />class C<br /> aa = 1<br /> def m<br /> p aa<br /> end<br /><br /> p aa<br />end<br /><br /><br />bareword, private method, <br />def aa<br /> p 'aaa'<br />end<br />aa<br /><br />,and puts, print are either<br />-----------------------------------<br /><br />whem, ===<br /><br />yield, block<br />[Q]: Why need code block <br />[A]: We could call the same function, but we could use different block to achieve different goal<br />yield, block both skills for using function like parameter<br /><br />rescue Errno::ENOENT => e<br /><br />-----------------------------------------<br />strip : lose the outer spaces<br />chop : remove last character<br />chomp : remove training newline<br /><br />eql? is more like ==<br />equal? test two object is the same or not<br /><br />:"Symbol need the quote if it has spaces"<br /><br />--------------------------------------------<br />Array.new(3, "abc") would be all the same object<br />Array.new(3){"abc"} that would be different objects<br /><br />add<br />unshift[.........]push<br /><br />remove<br />shift[............]pull return the element be removed<br /><br />[Q]: concat push, what is the different? <br />[A]: concat would sort, push would just add to the array tailer<br /><br />replcae is change the content of the original object<br /><br />>> [1,2,3].zip([4,5,6])<br />=> [[1, 4], [2, 5], [3, 6]]<br />>> [1,2,3].zip([4,5,6]).flatten<br />=> [1, 4, 2, 5, 3, 6]<br />>> [1,2,3].zip([4,5,6]).flatten.join<br />=> "142536"<br />>> [1,2,3].zip([4,5,6]).flatten.join(", ")<br />=> "1, 4, 2, 5, 3, 6"<br />>> [1,2,3].zip([6,2,3]).flatten.uniq<br />=> [1, 6, 2, 3]<br /><br />-----------------------------------------------------<br />find<br />find_all (select)<br />include?<br />reject<br /><br />>> User.find(:all, :conditions => "name like '%'").map(&:name)<br />=> ["早鳥", "flake", "flak", "lakela", "sandy", "lakela1", "什麼鬼什麼鬼什麼鬼啊啦", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br />>> User.find(:all, :conditions => "name like 'lake'").map(&:name)<br />=> []<br />>> User.find(:all, :conditions => "name like 'lake%'").map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all, :conditions => "name like 'lak%'").map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all, :conditions => "name like '%lak%'").map(&:name)<br />=> ["flake", "flak", "lakela", "lakela1", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br /><br />>> User.find(:all).find_all{|u| /^lake/.match(u.name)}.map(&:name)<br />=> ["lakela", "lakela1", "lake.ilakela2", "lake+iwakela"]<br />>> User.find(:all).find_all{|u| /lake/.match(u.name)}.map(&:name)<br />=> ["flake", "lakela", "lakela1", "lake.ilakela2", "lake+iwakela", "ilakelaaa"]<br /><br /><br /><br />>> h = {"a" => 1, "b" => 2, "c" => 3}<br />=> {"a"=>1, "b"=>2, "c"=>3}<br />>> h.values_at("a", "b")<br />=> [1, 2]<br />>> h["d"]<br />=> nil<br />>> h.fetch("d")<br />IndexError: key not found<br /> from (irb):17:in `fetch'<br /> from (irb):17<br /> from :0<br /><br /><br />Hash.new{block} block would be executed when access key does not exist<br />>> h = Hash.new{|hash, key| hash[key] = key }<br />=> {}<br />>> h["lake"]<br />=> "lake"<br />>> h<br />=> {"lake"=>"lake"}<br /><br />>> h<br />=> {"flake"=>"flake", "lake"=>"lake"}<br />>> h2<br />=> {"lake"=>"lakelake"}<br />>> h3 = h.merge(h2)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br /><br />>> h3.invert<br />=> {"lakelake"=>"lake", "flake"=>"flake"}<br /><br />>> h3.replace(h3.invert)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br />>> h3.clear<br />=> {}<br />>> h3<br />=> {}<br /><br />>> h4 = h.merge(h2)<br />=> {"flake"=>"flake", "lake"=>"lakelake"}<br />>> h4.keys<br />=> ["flake", "lake"]<br />>> h4.values<br />=> ["flake", "lakelake"]<br /><br />>> { 1 => "a", 2 => "b"}.find_all{|k, v| k%2 == 0}<br />=> [[2, "b"]]<br />become array<br /><br />>> { 1 => "a", 2 => "b"}.map{|k, v| [k*2, v.upcase]}<br />=> [[2, "A"], [4, "B"]]<br /><br />>> h.has_key?(1)<br />=> true<br />>> h.has_value?(1)<br />=> false<br /><br /><br />sort<br /><=><br /><br />>> User.find(:all).map(&:name).sort<br />=> ["flak", "flake", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "lakela", "lakela1", "sandy", "什麼鬼什麼鬼 什麼鬼啊啦", "早鳥"]<br />>> User.find(:all).map(&:name).sort do |a,b|; a.size <=> b.size;end<br />=> ["flak", "flake", "sandy", "lakela", "早鳥", "lakela1", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "什麼 鬼什麼鬼什麼鬼啊啦"]<br /><br />We could overwrite the <=> by a block <br /><br />>> User.find(:all).map(&:name).sort_by do |a|; a.size;end<br />=> ["flak", "flake", "sandy", "lakela", "早鳥", "lakela1", "ilakelaaa", "lake+iwakela", "lake.ilakela2", "什麼 鬼什麼鬼什麼鬼啊啦"]<br /><br /><br />-------------------------------------------<br />>> 'abc def' =~ /a/<br />=> 0<br />>> /a/ =~ 'abc def'<br />=> 0<br />>> /g/ =~ 'abc def'<br />=> nil<br />>> 'abc def' =~ /g/<br />=> nil<br /><br />Regexp stay in left or right is the same<br />if match, it would return the location of string, or return nil<br />>> /a/.match('abc def')<br />=> #<MatchData:0xb75f6da8><br />>> ('abc def').match(/a/)<br />=> #<MatchData:0xb75f1128><br /><br />>> m = 'ABClake.ilakela@gmail.com'.match(/([_a-z0-9-]+)(\.[_a-z0-9-]+)*(\+[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/)<br />=> #<MatchData:0xb759f1ac><br />>> m[0]<br />=> "lake.ilakela@gmail.com"<br />>> m[1]<br />=> "lake"<br />>> m[2]<br />=> ".ilakela"<br />>> m.captures[0]<br />=> "lake"<br />>> m.captures[1]<br />=> ".ilakela"<br /><br />$& match 到的 m[0]<br />$` match到 前面的string m.pre_match<br />$' match到 後面的string m.post_match<br />$1 $2 第1 ,2個() 裡面的東西 m[1], m[2]<br /><br />.>> m.begin(1) the first capture begin at location<br />=> 3<br />>> m.end(1)<br />=> 7<br /><br /><br />>> m = 'abc!def!ika!'.match(/.+!/)<br />=> #<MatchData:0xb753d614><br />>> m[0]<br />=> "abc!def!ika!"<br />>> m = 'abc!def!ika!'.match(/.+?!/)<br />=> #<MatchData:0xb753944c><br />>> m[0]<br />=> "abc!"<br /><br />add ? after +<br /><br />>> m = 'abc!def!ikdda!'.match(/\w{4}+!/)<br />=> #<MatchData:0xb7529344><br />>> m[0]<br /><br />>> m = 'abc!def!ikdda!'.match(/.{4,5}!/)<br />=> #<MatchData:0xb74f150c><br />>> m[0]<br />=> "c!def!"<br /><br />>> m = 'a3b4c5'.match(/([a-z]\d){2}/)<br />=> #<MatchData:0xb74c3468><br />>> m[0]<br />=> "a3b4"<br /><br /><br />>> m = 'abc def. gga'.match(/[a-z]+(?=\.)/)<br />=> #<MatchData:0xb74bcf3c><br />>> m[0]<br />=> "def"<br />>> m = 'abc def. gga'.match(/[a-z]+(?!\s)/)<br />=> #<MatchData:0xb74ac2f4><br />>> m[0]<br />=> "ab"<br /><br /><br />>> "a,b;c#d".split(/,|;|#/)<br />=> ["a", "b", "c", "d"]<br />>> "a,b;c#d".split(/,|;|#/, 2)<br />=> ["a", "b;c#d"]<br />>> "a,b;c#d".split(/,|;|#/, 3)<br />=> ["a", "b", "c#d"]<br /><br /><br />>> "a,bd,gre,gef,a".sub(/\w{3}(?=,)/) {|s| s.upcase}<br />=> "a,bd,GRE,gef,a"<br /><br />>> "a,bd,greGEF,a".sub(/(\w{3})([A-Z]{3})/, '\2\1') <br />=> "a,bd,GEFgre,a"<br /><br /><br /><br />>> ["ab", "bcd", "efg"].grep(/\w{3}/) {|w| w.upcase}<br />=> ["BCD", "EFG"]<br /><br />>> ["ab", "bcd", "efg"].select {|w| p w.upcase if w.match(/\w{3}/) }<br />"BCD"<br />"EFG"<br />=> []<br />>> ["ab", "bcd", "efg"].select {|w| w.upcase if w.match(/\w{3}/) }<br />=> ["bcd", "efg"]<br /><br />>> ["ab", "bcd", "efg"].map {|w| w.upcase if w.match(/\w{3}/) }<br />=> [nil, "BCD", "EFG"]<br /><br /><br />>> ["1","2",3].grep(/\d/)<br />=> ["1", "2"]<br /><br />--------------------------------<br />Proc.new is different from lambde in return scope<br /><br />const_set<br /><br /> alias_method :old_destroy, :destroy<br /><br /> def destroy(r)<br /> if r<br /> old_destroy<br /> else<br /> update_attribute(:removed_at, Time.now) if !removed_at<br /> end<br /> end<br /><br />----------------------------------<br />class Work < ActiveRecord::Base<br /> belongs_to :composer<br /><br /> def composer<br /> Composer.find(composer_id)<br /> end<br />end<br /><br /><br /><br />Returns a copy of self with all nil elements removed.<br /><br /> [ "a", nil, "b", nil, "c", nil ].compact<br /> #=> [ "a", "b", "c" ]<br /><br />-------------------------------------<br />Association callbacks, before_add, after_add, before_remove and after_remove<br /><br /> module FindOrCreateByNameExtension<br /> def find_or_create_by_name(name)<br /> first_name, last_name = name.split(" ", 2)<br /> find_or_create_by_first_name_and_last_name(first_name, last_name)<br /> end<br /> end<br /><br /> class Account < ActiveRecord::Base<br /> has_many :people, :extend => FindOrCreateByNameExtension<br /> end<br /><br /> class Company < ActiveRecord::Base<br /> has_many :people, :extend => FindOrCreateByNameExtension<br /> end<br /><br /><br /> class Account < ActiveRecord::Base<br /> has_many :people, :extend => [FindOrCreateByNameExtension, FindRecentExtension]<br /> end<br /><br /><br />Post.find(:all, :include => [ :author, :comments ])<br />Post.find(:all, :include => [ :author, { :comments => { :author => :gravatar } } ])<br />Post.find(:all, :include => [ :author, :comments ], :conditions => ['comments.approved = ?', true])<br />

rails default mode

一般如果只有用
bin/count_ad_render_num.rb 就是在 development mode
要在production 就要特別指定
bin/count_ad_render_num.rb -e production

rails default mode

一般如果只有用
bin/count_ad_render_num.rb 就是在 development mode
要在production 就要特別指定
bin/count_ad_render_num.rb -e production

deploy

設定dns
<br />#b1 /var/named/chroot/var/named/master/ooxx.com.tw<br /><br />f2 IN A 210.17.29.101<br />ad IN A 210.17.29.101<br />#跑起來<br />#/usr/local/sbin/named -t /var/named/chroot -u named<br />#看有無跑起來<br />#ps aux | grep named<br />
設定haproxy
<br />#f2 /etc/haproxy.cfg<br /><br /># The public 'www' address in the DMZ<br />frontend public<br /><br /> # Host: will use a specific keyword soon<br /> reqisetbe ^Host:\ ad ad<br /><br />backend ad<br /> mode http<br /> balance roundrobin<br /># option tcpsplice<br /> clitimeout 60000<br /> contimeout 5000<br /> srvtimeout 60000<br /> redispatch<br /> retries 3<br /># option httpchk HEAD /favicon.ico<br /> server f4 172.31.9.133:80 check inter 1000<br /><br />#跑起來<br />#sudo /home/youholder/script/restart-haproxy.sh<br />#內容<br />#/usr/local/sbin/haproxy -D -f /etc/haproxy.cfg -p /var/run/haproxy.pid -sf `cat /var/run/haproxy.pid`<br />
# restart apache server
/etc/init.d/httpd restart

#apache log 在這
tail -f /var/log/httpd/error_log

#看ip
/sbin/ifconfig

<br />#/etc/httpd/conf/httpd.conf<br /><br /><VirtualHost *:80><br /> ServerAdmin ad@goyou.com.tw<br /> ServerName ad.goyou.com.tw<br /> DocumentRoot /home/goadmin/ad_deploy/public<br /></VirtualHost><br /> <br /> LoadModule passenger_module /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.6/ext/apache2/mod_passenger.so<br /> PassengerRoot /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.6<br /> PassengerRuby /usr/local/bin/ruby<br />
<br />development:<br /> adapter: mysql<br /> database: ad_server<br /> username: root<br /> password: hiroot<br /> host: 127.0.0.1<br /> port: 4040<br /> encoding: utf8<br /> <br />production:<br /> adapter: mysql<br /> database: ad_server<br /> username: root<br /> password: hiroot<br /> host: 127.0.0.1<br /> port: 4040<br /> encoding: utf8<br />
<br />/etc/hosts<br />127.0.0.1 f4 localhost.localdomain localhost<br />
<br /> mysql -uroot -phiroot -h127.0.0.1 -P4040<br />
<br />telnet localhost 80<br /><br />GET / HTTP/1.0<br />

deploy

設定dns
<br />#b1 /var/named/chroot/var/named/master/ooxx.com.tw<br /><br />f2 IN A 210.17.29.101<br />ad IN A 210.17.29.101<br />#跑起來<br />#/usr/local/sbin/named -t /var/named/chroot -u named<br />#看有無跑起來<br />#ps aux | grep named<br />
設定haproxy
<br />#f2 /etc/haproxy.cfg<br /><br /># The public 'www' address in the DMZ<br />frontend public<br /><br /> # Host: will use a specific keyword soon<br /> reqisetbe ^Host:\ ad ad<br /><br />backend ad<br /> mode http<br /> balance roundrobin<br /># option tcpsplice<br /> clitimeout 60000<br /> contimeout 5000<br /> srvtimeout 60000<br /> redispatch<br /> retries 3<br /># option httpchk HEAD /favicon.ico<br /> server f4 172.31.9.133:80 check inter 1000<br /><br />#跑起來<br />#sudo /home/youholder/script/restart-haproxy.sh<br />#內容<br />#/usr/local/sbin/haproxy -D -f /etc/haproxy.cfg -p /var/run/haproxy.pid -sf `cat /var/run/haproxy.pid`<br />
# restart apache server
/etc/init.d/httpd restart

#apache log 在這
tail -f /var/log/httpd/error_log

#看ip
/sbin/ifconfig

<br />#/etc/httpd/conf/httpd.conf<br /><br /><VirtualHost *:80><br /> ServerAdmin ad@goyou.com.tw<br /> ServerName ad.goyou.com.tw<br /> DocumentRoot /home/goadmin/ad_deploy/public<br /></VirtualHost><br /> <br /> LoadModule passenger_module /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.6/ext/apache2/mod_passenger.so<br /> PassengerRoot /usr/local/lib/ruby/gems/1.8/gems/passenger-2.0.6<br /> PassengerRuby /usr/local/bin/ruby<br />
<br />development:<br /> adapter: mysql<br /> database: ad_server<br /> username: root<br /> password: hiroot<br /> host: 127.0.0.1<br /> port: 4040<br /> encoding: utf8<br /> <br />production:<br /> adapter: mysql<br /> database: ad_server<br /> username: root<br /> password: hiroot<br /> host: 127.0.0.1<br /> port: 4040<br /> encoding: utf8<br />
<br />/etc/hosts<br />127.0.0.1 f4 localhost.localdomain localhost<br />
<br /> mysql -uroot -phiroot -h127.0.0.1 -P4040<br />
<br />telnet localhost 80<br /><br />GET / HTTP/1.0<br />

Gem dependencies

Gem dependencies
What is new :Gem Dependencies
把application 需要的gem 可以直接寫在設定檔裡, 綁在app 上
不過我在2.2 想用, 卻爆了看起來應該是這個問題 Handle missing dependencies in gem loading

不過現在有點懶之後再用 orz

Gem dependencies

Gem dependencies
What is new :Gem Dependencies
把application 需要的gem 可以直接寫在設定檔裡, 綁在app 上
不過我在2.2 想用, 卻爆了看起來應該是這個問題 Handle missing dependencies in gem loading

不過現在有點懶之後再用 orz

liquid,dynamic content

railscast liquid
liquid
liquid wiki
如果想要動態去編輯網頁上的 content 傳些變數進去, 就是需要這個, 什麼意思勒
就是例如我是admin, 我想要編輯公告時, 傳些人名的參數進去, 可是不想要改 code, 想要直接改db的內容就好, 就可以用這個,
<br />#blahblah<br />{{ user.name}}#blahblah<br />#blahblah<br />

liquid,dynamic content

railscast liquid
liquid
liquid wiki
如果想要動態去編輯網頁上的 content 傳些變數進去, 就是需要這個, 什麼意思勒
就是例如我是admin, 我想要編輯公告時, 傳些人名的參數進去, 可是不想要改 code, 想要直接改db的內容就好, 就可以用這個,
<br />#blahblah<br />{{ user.name}}#blahblah<br />#blahblah<br />

All About Layouts

railscast All About Layouts
layout 幾個常用的用法
<br /># projects_controller.rb<br />layout :user_layout<br />#或者可以直接傳 string, layout :application<br /><br />def index<br /> @projects = Project.find(:all)<br /> render :layout => 'projects'<br /> #除了上面這個可以在 render 時再去指定, 也可以 :layout => false 選擇不要layout了<br />end<br /><br />protected<br /><br />#如果 layout :user_layout 傳的是symbol 就會找method<br />def user_layout<br /> if current_user.admin?<br /> "admin"<br /> else<br /> "application"<br /> end<br />end<br />

All About Layouts

railscast All About Layouts
layout 幾個常用的用法
<br /># projects_controller.rb<br />layout :user_layout<br />#或者可以直接傳 string, layout :application<br /><br />def index<br /> @projects = Project.find(:all)<br /> render :layout => 'projects'<br /> #除了上面這個可以在 render 時再去指定, 也可以 :layout => false 選擇不要layout了<br />end<br /><br />protected<br /><br />#如果 layout :user_layout 傳的是symbol 就會找method<br />def user_layout<br /> if current_user.admin?<br /> "admin"<br /> else<br /> "application"<br /> end<br />end<br />

rails 2.2 extra, delegate,gem

9.3. Delegates With Prefixes
<br />class Vendor < ActiveRecord::Base<br /> has_one :account<br /> delegate :email, :password, :to => :account, :prefix => true<br />end<br /># vendor#account_email and vendor#account_password<br /><br />class Vendor < ActiveRecord::Base<br /> has_one :account<br /> delegate :email, :password, :to => :account, :prefix => :owner<br />end<br /><br /># endor#owner_email and vendor#owner_password<br />
還有一堆玩具
#

past?, today? and future? for Date and Time classes to facilitate date/time comparisons.
#

Array#second through Array#tenth as aliases for Array#[1] through Array#[9]
#

Enumerable#many? to encapsulate collection.size > 1
#

Inflector#parameterize produces a URL-ready version of its input, for use in to_param.
#

Time#advance recognizes fractional days and weeks, so you can do 1.7.weeks.ago, 1.5.hours.since, and so on.


10.1. config.gems

To avoid deployment issues and make Rails applications more self-contained, it's possible to place copies of all of the gems that your Rails application requires in /vendor/gems

*

config.gem gem_name in your config/environment.rb file
*

rake gems to list all configured gems, as well as whether they (and their dependencies) are installed or frozen
*

rake gems:install to install missing gems to the computer
*

rake gems:unpack to place a copy of the required gems into /vendor/gems
*

rake gems:unpack:dependencies to get copies of the required gems and their dependencies into /vendor/gems
*

rake gems:build to build any missing native extensions
*

rake gems:refresh_specs to bring vendored gems created with Rails 2.1 into alignment with the Rails 2.2 way of storing them

You can unpack or install a single gem by specifying GEM=gem_name

rails 2.2 extra, delegate,gem

9.3. Delegates With Prefixes
<br />class Vendor < ActiveRecord::Base<br /> has_one :account<br /> delegate :email, :password, :to => :account, :prefix => true<br />end<br /># vendor#account_email and vendor#account_password<br /><br />class Vendor < ActiveRecord::Base<br /> has_one :account<br /> delegate :email, :password, :to => :account, :prefix => :owner<br />end<br /><br /># endor#owner_email and vendor#owner_password<br />
還有一堆玩具
#

past?, today? and future? for Date and Time classes to facilitate date/time comparisons.
#

Array#second through Array#tenth as aliases for Array#[1] through Array#[9]
#

Enumerable#many? to encapsulate collection.size > 1
#

Inflector#parameterize produces a URL-ready version of its input, for use in to_param.
#

Time#advance recognizes fractional days and weeks, so you can do 1.7.weeks.ago, 1.5.hours.since, and so on.


10.1. config.gems

To avoid deployment issues and make Rails applications more self-contained, it's possible to place copies of all of the gems that your Rails application requires in /vendor/gems

*

config.gem gem_name in your config/environment.rb file
*

rake gems to list all configured gems, as well as whether they (and their dependencies) are installed or frozen
*

rake gems:install to install missing gems to the computer
*

rake gems:unpack to place a copy of the required gems into /vendor/gems
*

rake gems:unpack:dependencies to get copies of the required gems and their dependencies into /vendor/gems
*

rake gems:build to build any missing native extensions
*

rake gems:refresh_specs to bring vendored gems created with Rails 2.1 into alignment with the Rails 2.2 way of storing them

You can unpack or install a single gem by specifying GEM=gem_name

each_with_object,inject

注意inject 和 each_with_object , hash 和 str 的參數位置是相反的,
而且inject 傳回去的是上次的結果, 所以要把那個 hsh 傳回去
<br />>>%w(foo bar).inject({}) { |hsh, str| hsh[str] = str.upcase; hsh}<br />=> {"foo"=>"FOO", "bar"=>"BAR"}<br /><br />>> %w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase }<br />=> {"foo"=>"FOO", "bar"=>"BAR"}<br />

each_with_object,inject

注意inject 和 each_with_object , hash 和 str 的參數位置是相反的,
而且inject 傳回去的是上次的結果, 所以要把那個 hsh 傳回去
<br />>>%w(foo bar).inject({}) { |hsh, str| hsh[str] = str.upcase; hsh}<br />=> {"foo"=>"FOO", "bar"=>"BAR"}<br /><br />>> %w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase }<br />=> {"foo"=>"FOO", "bar"=>"BAR"}<br />

header, redirect_to , render js, polymorphic_path

6.4. Other Action Controller Changes

HTTP Accept header 現在default 是 disable 啦, 想要打開要自己開<br />config.action_controller.user_accept_header = true.<br />
不然就是自己在生時後面要有type啦 像 url /customers/1.xml

---

redirect_to now fully supports URI schemes (so, for example, you can redirect to a svn+ssh: URI).

---

有js 參數可以用不用在自己設response.headers['Content-Type']='text/javascript'
render now supports a :js option to render plain vanilla javascript with the right mime type.

---

Polymorphic URLs behave more sensibly if a passed parameter is nil. For example, calling polymorphic_path([@project, @date, @area]) with a nil date will give you project_area_path

header, redirect_to , render js, polymorphic_path

6.4. Other Action Controller Changes

HTTP Accept header 現在default 是 disable 啦, 想要打開要自己開<br />config.action_controller.user_accept_header = true.<br />
不然就是自己在生時後面要有type啦 像 url /customers/1.xml

---

redirect_to now fully supports URI schemes (so, for example, you can redirect to a svn+ssh: URI).

---

有js 參數可以用不用在自己設response.headers['Content-Type']='text/javascript'
render now supports a :js option to render plain vanilla javascript with the right mime type.

---

Polymorphic URLs behave more sensibly if a passed parameter is nil. For example, calling polymorphic_path([@project, @date, @area]) with a nil date will give you project_area_path

Rescue from dispatching, layout mailer

Rescue from dispatching
人家這個sample 太好 不知道要講啥 XD
<br />class ApplicationController < ActionController::Base<br /> rescue_from ActionController::RoutingError, :with => :route_not_found<br /> rescue_from ActionController::MethodNotAllowed, :with => :invalid_method<br /> <br /> private<br /> <br /> def route_not_found<br /> render :text => 'What the fuck are you looking for ?', :status => :not_found<br /> end<br /> <br /> def invalid_method<br /> message = "Now, did your mom tell you to #{request.request_method.to_s.upcase} that ?"<br /> render :text => message, :status => :method_not_allowed<br /> end<br />end<br />
Mailer Layouts
default 他會找 layout 裡 加上 _mailer的, 像這邊就是會去找layouts/user_mailer.html.erb <br />class UserMailer < ActionMailer::Base<br /> def registration(user)<br /> subject "You've registered"<br /> from "system@example.com"<br /> end<br />end<br />
當然也可以自己指定 layou
<br />class UserMailer < ActionMailer::Base<br /> layout 'email'<br /> ...<br />end<br />

Rescue from dispatching, layout mailer

Rescue from dispatching
人家這個sample 太好 不知道要講啥 XD
<br />class ApplicationController < ActionController::Base<br /> rescue_from ActionController::RoutingError, :with => :route_not_found<br /> rescue_from ActionController::MethodNotAllowed, :with => :invalid_method<br /> <br /> private<br /> <br /> def route_not_found<br /> render :text => 'What the fuck are you looking for ?', :status => :not_found<br /> end<br /> <br /> def invalid_method<br /> message = "Now, did your mom tell you to #{request.request_method.to_s.upcase} that ?"<br /> render :text => message, :status => :method_not_allowed<br /> end<br />end<br />
Mailer Layouts
default 他會找 layout 裡 加上 _mailer的, 像這邊就是會去找layouts/user_mailer.html.erb <br />class UserMailer < ActionMailer::Base<br /> def registration(user)<br /> subject "You've registered"<br /> from "system@example.com"<br /> end<br />end<br />
當然也可以自己指定 layou
<br />class UserMailer < ActionMailer::Base<br /> layout 'email'<br /> ...<br />end<br />

Shallow Routes, Resources With Specific Actions

Shallow Routes
<br /> map.resources :users, :shallow => true do |user|<br /> user.resources :books<br /><br /> end<br />
不過books_path 還是不能叫的

6.3 Resources With Specific Actions
現在你可以指定你想要生哪個 action 的 path, 要route哪些, 因為Rails 生這些東西也是要耗memory的, 而這些設定會被nested resource 繼承
<br />map.resources :photos, :only => [:index, :show]<br />map.resources :products, :except => :destroy<br />

Shallow Routes, Resources With Specific Actions

Shallow Routes
<br /> map.resources :users, :shallow => true do |user|<br /> user.resources :books<br /><br /> end<br />
不過books_path 還是不能叫的

6.3 Resources With Specific Actions
現在你可以指定你想要生哪個 action 的 path, 要route哪些, 因為Rails 生這些東西也是要耗memory的, 而這些設定會被nested resource 繼承
<br />map.resources :photos, :only => [:index, :show]<br />map.resources :products, :except => :destroy<br />

etag,last_modified,Get

Even Better Conditional GET Support
rails 2.2 release note


至於 browser什麼時候會發etag, last_modified, 讓你看見 304勒
就是看browser啦, 如果是reload大部分就是不發 etag, last_modified 就是要你server一定要吐view了, 直接連才會, 而且post 是不發etag, last_modified的

應該吧...

etag,last_modified,Get

Even Better Conditional GET Support
rails 2.2 release note


至於 browser什麼時候會發etag, last_modified, 讓你看見 304勒
就是看browser啦, 如果是reload大部分就是不發 etag, last_modified 就是要你server一定要吐view了, 直接連才會, 而且post 是不發etag, last_modified的

應該吧...

rails, thread-safe

Q/A: What Thread-safe Rails Means
Thread safety for your Rails

rails, thread-safe

Q/A: What Thread-safe Rails Means
Thread safety for your Rails

alias_method_chain

alias_method_chain

alias_method A, B 有點就是 B 把function copy 一份到B

Encapsulates the common pattern of:<br /> alias_method :foo_without_feature, :foo<br /> alias_method :foo, :foo_with_feature<br />
這就像是foo 沒改feature之前 copy 一份 所以叫做 foo_without_feature
然後弄了個function 叫做foo_with_feature 然後蓋掉 foo
之後叫foo 就是有feature的 foo_with_feature

With this, you simply do:<br /> alias_method_chain :foo, :feature<br />
And both aliases are set up for you.

Query and bang methods (foo?, foo!) keep the same punctuation:<br /> alias_method_chain :foo?, :feature<br />
is equivalent to<br /> alias_method :foo_without_feature?, :foo?<br /> alias_method :foo?, :foo_with_feature?<br />
so you can safely chain foo, foo?, and foo! with the same feature.

alias_method_chain

alias_method_chain

alias_method A, B 有點就是 B 把function copy 一份到B

Encapsulates the common pattern of:<br /> alias_method :foo_without_feature, :foo<br /> alias_method :foo, :foo_with_feature<br />
這就像是foo 沒改feature之前 copy 一份 所以叫做 foo_without_feature
然後弄了個function 叫做foo_with_feature 然後蓋掉 foo
之後叫foo 就是有feature的 foo_with_feature

With this, you simply do:<br /> alias_method_chain :foo, :feature<br />
And both aliases are set up for you.

Query and bang methods (foo?, foo!) keep the same punctuation:<br /> alias_method_chain :foo?, :feature<br />
is equivalent to<br /> alias_method :foo_without_feature?, :foo?<br /> alias_method :foo?, :foo_with_feature?<br />
so you can safely chain foo, foo?, and foo! with the same feature.

rails2.2 extra, dynamic finder

Rails2.2 release note
railscast rails2.2 extra
javaeye rails 2.2 release note

5.4 New Dynamic Finders<br />>> User.find(123)<br />ActiveRecord::RecordNotFound: Couldn't find User with ID=123<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1528:in `find_one'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1511:in `find_from_ids'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:590:in `find'<br /> from (irb):1<br />>> User.find_by_id(123)<br />=> nil<br />#Rails 2.2 多了下面這個<br />>> User.find_by_id!(123)<br />ActiveRecord::RecordNotFound: ActiveRecord::RecordNotFound<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1814:in `find_by_id!'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1800:in `send'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1800:in `method_missing'<br /> from (irb):3<br />>> <br />

rails2.2 extra, dynamic finder

Rails2.2 release note
railscast rails2.2 extra
javaeye rails 2.2 release note

5.4 New Dynamic Finders<br />>> User.find(123)<br />ActiveRecord::RecordNotFound: Couldn't find User with ID=123<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1528:in `find_one'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1511:in `find_from_ids'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:590:in `find'<br /> from (irb):1<br />>> User.find_by_id(123)<br />=> nil<br />#Rails 2.2 多了下面這個<br />>> User.find_by_id!(123)<br />ActiveRecord::RecordNotFound: ActiveRecord::RecordNotFound<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1814:in `find_by_id!'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1800:in `send'<br /> from /usr/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/base.rb:1800:in `method_missing'<br /> from (irb):3<br />>> <br />

join,include

mysql, 是沒有include 這種東西的
在rails 下join 如
<br />#用join 就會把所有的relation table 全都join 起來變成大table<br />AdFile.find(:all, :joins => :locations)<br /><br />SELECT `ad_files`.* FROM `ad_files` INNER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) INNER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`)<br /><br />#如果是用include 意義是一樣, 可是rails 會幫妳把他分成幾個sql 去做, 這樣就不會因為join 的table 太大會痛了<br />AdFile.find(:all, :include => :locations)<br /><br /> SELECT * FROM `ad_files` <br /> SELECT `file_locations`.* FROM `file_locations` WHERE (`file_locations`.ad_file_id IN (17,18,19))<br /> SELECT * FROM `locations` WHERE (`locations`.`id` IN (1,2,3)) <br />
rails 用join 就是用inner join 弄成一整個大的object, association 就沒了
用include 有的時候因為條件裡直接需要用到另個table 的條件, 是用left join 但仍維持 association 的關係
<br />AdFile.find(:all, :joins => :locations, :conditions => {:locations => {:code => 'goyou_top'}}).first.locations<br /><br />SELECT `ad_files`.`id` AS t0_r0, `ad_files`.`buyer_id` AS t0_r1, `ad_files`.`render_num` AS t0_r2, `ad_files`.`file_type` AS t0_r3, `ad_files`.`filename` AS t0_r4, `ad_files`.`redirect_url` AS t0_r5, `ad_files`.`start_at` AS t0_r6, `ad_files`.`expire_at` AS t0_r7, `ad_files`.`created_at` AS t0_r8, `ad_files`.`active` AS t0_r9, `locations`.`id` AS t1_r0, `locations`.`code` AS t1_r1, `locations`.`height` AS t1_r2, `locations`.`width` AS t1_r3 FROM `ad_files` LEFT OUTER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) LEFT OUTER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`) WHERE (locations.code = 'goyou_top')<br />#如果妳就算不取locations 會發現sql 也一樣<br /><br /><br />AdFile.find(:all, :joins => :locations, :conditions => {:locations => {:code => 'goyou_top'}}).first.locations<br /><br /> SELECT `ad_files`.* FROM `ad_files` INNER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) INNER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`) WHERE (`locations`.`code` = 'goyou_top')<br /><br />SELECT `locations`.* FROM `locations` INNER JOIN file_locations ON locations.id = file_locations.location_id WHERE ((`file_locations`.ad_file_id = 18))<br />#會發現location 根本是重新在join 一次去取的<br />#但其實要取location 的資料可以直接在join 回來的object 直接拿就可以了<br />

另外rails 2.2 可以把 join 寫的high 一點了
Easy Join Table Conditions<br />class Article < ActiveRecord::Base<br /> belongs_to :user<br />end<br /><br />class User < ActiveRecord::Base<br /> has_many :articles<br />end<br /><br /># Get all the users that have published articles<br />User.find(:all, :joins => :article,<br /> :conditions => ["articles.published = ?", true])<br /><br /># high 一點的寫法<br /># Get all the users that have published articles <br />User.find(:all, :joins => :article,<br /> :conditions => { :articles => { :published => true } })<br />

join,include

mysql, 是沒有include 這種東西的
在rails 下join 如
<br />#用join 就會把所有的relation table 全都join 起來變成大table<br />AdFile.find(:all, :joins => :locations)<br /><br />SELECT `ad_files`.* FROM `ad_files` INNER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) INNER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`)<br /><br />#如果是用include 意義是一樣, 可是rails 會幫妳把他分成幾個sql 去做, 這樣就不會因為join 的table 太大會痛了<br />AdFile.find(:all, :include => :locations)<br /><br /> SELECT * FROM `ad_files` <br /> SELECT `file_locations`.* FROM `file_locations` WHERE (`file_locations`.ad_file_id IN (17,18,19))<br /> SELECT * FROM `locations` WHERE (`locations`.`id` IN (1,2,3)) <br />
rails 用join 就是用inner join 弄成一整個大的object, association 就沒了
用include 有的時候因為條件裡直接需要用到另個table 的條件, 是用left join 但仍維持 association 的關係
<br />AdFile.find(:all, :joins => :locations, :conditions => {:locations => {:code => 'goyou_top'}}).first.locations<br /><br />SELECT `ad_files`.`id` AS t0_r0, `ad_files`.`buyer_id` AS t0_r1, `ad_files`.`render_num` AS t0_r2, `ad_files`.`file_type` AS t0_r3, `ad_files`.`filename` AS t0_r4, `ad_files`.`redirect_url` AS t0_r5, `ad_files`.`start_at` AS t0_r6, `ad_files`.`expire_at` AS t0_r7, `ad_files`.`created_at` AS t0_r8, `ad_files`.`active` AS t0_r9, `locations`.`id` AS t1_r0, `locations`.`code` AS t1_r1, `locations`.`height` AS t1_r2, `locations`.`width` AS t1_r3 FROM `ad_files` LEFT OUTER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) LEFT OUTER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`) WHERE (locations.code = 'goyou_top')<br />#如果妳就算不取locations 會發現sql 也一樣<br /><br /><br />AdFile.find(:all, :joins => :locations, :conditions => {:locations => {:code => 'goyou_top'}}).first.locations<br /><br /> SELECT `ad_files`.* FROM `ad_files` INNER JOIN `file_locations` ON (`ad_files`.`id` = `file_locations`.`ad_file_id`) INNER JOIN `locations` ON (`locations`.`id` = `file_locations`.`location_id`) WHERE (`locations`.`code` = 'goyou_top')<br /><br />SELECT `locations`.* FROM `locations` INNER JOIN file_locations ON locations.id = file_locations.location_id WHERE ((`file_locations`.ad_file_id = 18))<br />#會發現location 根本是重新在join 一次去取的<br />#但其實要取location 的資料可以直接在join 回來的object 直接拿就可以了<br />

另外rails 2.2 可以把 join 寫的high 一點了
Easy Join Table Conditions<br />class Article < ActiveRecord::Base<br /> belongs_to :user<br />end<br /><br />class User < ActiveRecord::Base<br /> has_many :articles<br />end<br /><br /># Get all the users that have published articles<br />User.find(:all, :joins => :article,<br /> :conditions => ["articles.published = ?", true])<br /><br /># high 一點的寫法<br /># Get all the users that have published articles <br />User.find(:all, :joins => :article,<br /> :conditions => { :articles => { :published => true } })<br />

sql,DATE,group by

想要計算某些column 每天的總數時, 可以用sql 的DATE<br />#select 出這個月份每天的render 數<br />>> Render.count(:all, :conditions => {:created_at => Time.now.beginning_of_month..Time.now}, :group => 'DATE(created_at)')<br /><br />SELECT count(*) AS count_all, DATE(created_at) AS date_created_at FROM `renders` WHERE (`renders`.`created_at` BETWEEN '2008-12-01 00:00:00' AND '2008-12-17 16:09:20') GROUP BY DATE(created_at)<br /><br />=> [["2008-12-16", 1], ["2008-12-17", 24]]<br />
結果出來是 OrderedHash 所以要用
hash["2008-12-16"] 去取值, 當然hash 的相關method 也可以用

sql,DATE,group by

想要計算某些column 每天的總數時, 可以用sql 的DATE<br />#select 出這個月份每天的render 數<br />>> Render.count(:all, :conditions => {:created_at => Time.now.beginning_of_month..Time.now}, :group => 'DATE(created_at)')<br /><br />SELECT count(*) AS count_all, DATE(created_at) AS date_created_at FROM `renders` WHERE (`renders`.`created_at` BETWEEN '2008-12-01 00:00:00' AND '2008-12-17 16:09:20') GROUP BY DATE(created_at)<br /><br />=> [["2008-12-16", 1], ["2008-12-17", 24]]<br />
結果出來是 OrderedHash 所以要用
hash["2008-12-16"] 去取值, 當然hash 的相關method 也可以用

Block in views, concat, capture, content_for,yield,content_tag

rails 2.2 block in view
block in view before
<br /># 2.2 之前, 叫concat 時都要, 叫block.binding<br /># 2.2 之後就不用囉<br />=begin<br />用這樣就可以不用在view 裡面做一堆 <% if admin 的動作 %><br />也可以把view content 不同的部份當成 variable 來用帶入相同的外圍, DRY<br />=end<br />#version rails 2.0.2<br />def admin_area(&block)<br /> if admin?<br /> concat content_tag(:div, capture(&block), :class => 'admin'), block.binding<br /> end<br />end<br /><br />#version rails 2.2<br />def admin_area(&block)<br /> if admin?<br /> concat content_tag(:div, capture(&block), :class => 'admin')<br /> end<br />end<br />
concat source code<br />#actionpack-2.0.2/lib/action_view/helpers/text_helper.rb<br /> def concat(string, binding)<br /> eval(ActionView::Base.erb_variable, binding) << string<br /> end<br /><br />#actionpack-2.2.2/lib/action_view/helpers/text_helper.rb<br /> def concat(string, unused_binding = nil)<br /> if unused_binding<br /> ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed. Please remove it from your views and helpers.", caller)<br /> end<br /><br /> output_buffer << string<br /> end<br />

---

其他學到的 concat, capture, yield,content_tag

concat <br /> # The preferred method of outputting text in your views is to use the<br /> # <%= "text" %> eRuby syntax. The regular _puts_ and _print_ methods<br /> # do not operate as expected in an eRuby code block. If you absolutely must<br /> # output text within a non-output code block (i.e., <% %>), you can use the concat method.<br /> <br />你不想在外面的view, 弄一堆 <% %> 的 tag<br />可以選擇用一個大的包起來, 然後用concat 把需要呈現在view 的地方印出來<br />
capture<br />#The capture method allows you to extract part of a template into a variable. You can then use this variable anywhere in your templates or layout.<br /><br />#可以讓你把把view 存起來當變數, 做一些判斷<br />#在上面block in view 的作用就是這樣 先存起來讓concat 去用<br />#如果是用yield 就會直接出去在view了<br />#views/list.rhtml<br /><% @header = capture do %><br /> <%= link_to "#{@user.name}的早起紀錄", home_url, :class => 'ebhead'%><br /><% end %><br /><br />#layout.rhtml<br /> <% if @header %><br /> <h1 class="ebhead"><br /> #OOXX<br /> <%= @header %><br /> #OOXX<br /> </h1><br /> <% else %><br /> <h1 class="ebhead"><br /> #OOXX<br /> <%= @header %><br /> #OOXX<br /> </h1><br /> <% end %><br />
yield, content_for<br />#yield 最常用的到當然就是在layout 叫content<br /><br /> <%= yield %><br /><br />#再來就是利用content_for 把 部份的 view 存成block<br /><br />#layouts/application.html.erb<br /><br />(head)<br /> <%= yield :head_specific %><br />(/head)<br />#views/show.html.erb<br /><br /> <% content_for :head_specific do %><br /> #可以根據不同的頁面去放不同的東西例如include 不同的css<br /> #然後等 yield, 這邊就是會在layout 裡 head tag 裡面放入 <br /> [%= stylesheet_link_tag "main" %]<br /> [%= javascript_include_tag "spotlight" %]<br /> <% end %><br />
content_tag<br />=begin<br />Returns an HTML block tag of type name surrounding the content. Add HTML attributes by<br /> passing an attributes hash to options. Instead of passing the content as an argument, you <br />can also use a block in which case, you pass your options as the second parameter. Set <br />escape to false to disable attribute value escaping.<br /><br />完全就是很high 的讓你不用寫html 包來包去<br />尤其是在上面用concat 的地方 不用 concat '<div>' ... concat '</div>'<br />=end<br /> content_tag(:p, "Hello world!")<br /> # => <p>Hello world!</p><br /> content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong")<br /> # => <div class="strong"><p>Hello world!</p></div><br /> content_tag("select", options, :multiple => true)<br /> # => <select multiple="multiple">...options...</select><br /><br /> <% content_tag :div, :class => "strong" do -%><br /> Hello world!<br /> <% end -%><br /> # => <div class="strong">Hello world!</div><br />

Block in views, concat, capture, content_for,yield,content_tag

rails 2.2 block in view
block in view before
<br /># 2.2 之前, 叫concat 時都要, 叫block.binding<br /># 2.2 之後就不用囉<br />=begin<br />用這樣就可以不用在view 裡面做一堆 <% if admin 的動作 %><br />也可以把view content 不同的部份當成 variable 來用帶入相同的外圍, DRY<br />=end<br />#version rails 2.0.2<br />def admin_area(&block)<br /> if admin?<br /> concat content_tag(:div, capture(&block), :class => 'admin'), block.binding<br /> end<br />end<br /><br />#version rails 2.2<br />def admin_area(&block)<br /> if admin?<br /> concat content_tag(:div, capture(&block), :class => 'admin')<br /> end<br />end<br />
concat source code<br />#actionpack-2.0.2/lib/action_view/helpers/text_helper.rb<br /> def concat(string, binding)<br /> eval(ActionView::Base.erb_variable, binding) << string<br /> end<br /><br />#actionpack-2.2.2/lib/action_view/helpers/text_helper.rb<br /> def concat(string, unused_binding = nil)<br /> if unused_binding<br /> ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed. Please remove it from your views and helpers.", caller)<br /> end<br /><br /> output_buffer << string<br /> end<br />

---

其他學到的 concat, capture, yield,content_tag

concat <br /> # The preferred method of outputting text in your views is to use the<br /> # <%= "text" %> eRuby syntax. The regular _puts_ and _print_ methods<br /> # do not operate as expected in an eRuby code block. If you absolutely must<br /> # output text within a non-output code block (i.e., <% %>), you can use the concat method.<br /> <br />你不想在外面的view, 弄一堆 <% %> 的 tag<br />可以選擇用一個大的包起來, 然後用concat 把需要呈現在view 的地方印出來<br />
capture<br />#The capture method allows you to extract part of a template into a variable. You can then use this variable anywhere in your templates or layout.<br /><br />#可以讓你把把view 存起來當變數, 做一些判斷<br />#在上面block in view 的作用就是這樣 先存起來讓concat 去用<br />#如果是用yield 就會直接出去在view了<br />#views/list.rhtml<br /><% @header = capture do %><br /> <%= link_to "#{@user.name}的早起紀錄", home_url, :class => 'ebhead'%><br /><% end %><br /><br />#layout.rhtml<br /> <% if @header %><br /> <h1 class="ebhead"><br /> #OOXX<br /> <%= @header %><br /> #OOXX<br /> </h1><br /> <% else %><br /> <h1 class="ebhead"><br /> #OOXX<br /> <%= @header %><br /> #OOXX<br /> </h1><br /> <% end %><br />
yield, content_for<br />#yield 最常用的到當然就是在layout 叫content<br /><br /> <%= yield %><br /><br />#再來就是利用content_for 把 部份的 view 存成block<br /><br />#layouts/application.html.erb<br /><br />(head)<br /> <%= yield :head_specific %><br />(/head)<br />#views/show.html.erb<br /><br /> <% content_for :head_specific do %><br /> #可以根據不同的頁面去放不同的東西例如include 不同的css<br /> #然後等 yield, 這邊就是會在layout 裡 head tag 裡面放入 <br /> [%= stylesheet_link_tag "main" %]<br /> [%= javascript_include_tag "spotlight" %]<br /> <% end %><br />
content_tag<br />=begin<br />Returns an HTML block tag of type name surrounding the content. Add HTML attributes by<br /> passing an attributes hash to options. Instead of passing the content as an argument, you <br />can also use a block in which case, you pass your options as the second parameter. Set <br />escape to false to disable attribute value escaping.<br /><br />完全就是很high 的讓你不用寫html 包來包去<br />尤其是在上面用concat 的地方 不用 concat '<div>' ... concat '</div>'<br />=end<br /> content_tag(:p, "Hello world!")<br /> # => <p>Hello world!</p><br /> content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong")<br /> # => <div class="strong"><p>Hello world!</p></div><br /> content_tag("select", options, :multiple => true)<br /> # => <select multiple="multiple">...options...</select><br /><br /> <% content_tag :div, :class => "strong" do -%><br /> Hello world!<br /> <% end -%><br /> # => <div class="strong">Hello world!</div><br />

memoizable,rails2.2

railscast memorizable
Easy Memoization
A Guide to Memoization
<br />#sudo gem install rails<br />#sudo gem update --system<br />#sudo gem install rubygems-update<br />#sudo update_rubygems<br />#gem -v<br /><br />lass Product < ActiveRecord::Base<br /> extend ActiveSupport::Memoizable<br /> <br /> belongs_to :category<br /> <br /> def filesize(num = 1)<br /> # some expensive operation<br /> sleep 2<br /> 12345789 * num<br /> end<br /> memoize :filesize<br />end<br />

memoizable,rails2.2

railscast memorizable
Easy Memoization
A Guide to Memoization
<br />#sudo gem install rails<br />#sudo gem update --system<br />#sudo gem install rubygems-update<br />#sudo update_rubygems<br />#gem -v<br /><br />lass Product < ActiveRecord::Base<br /> extend ActiveSupport::Memoizable<br /> <br /> belongs_to :category<br /> <br /> def filesize(num = 1)<br /> # some expensive operation<br /> sleep 2<br /> 12345789 * num<br /> end<br /> memoize :filesize<br />end<br />

overwrite attr_writer,=

<br /> #models/file.rb<br /> #把每個進來的url 補上 http://<br /> def redirect_url=(url)<br /> unless url =~ /(^http:\/\/)/<br /> url = "http://#{url}"<br /> end<br /><br /> self[:redirect_url] = url<br /> end<br />

overwrite attr_writer,=

<br /> #models/file.rb<br /> #把每個進來的url 補上 http://<br /> def redirect_url=(url)<br /> unless url =~ /(^http:\/\/)/<br /> url = "http://#{url}"<br /> end<br /><br /> self[:redirect_url] = url<br /> end<br />

rails I18n sample

railscast i18n
Rails 2.2.0 I18n 的使用筆記

一般的預設訊息可以到
http://github.com/svenfuchs/rails-i18n/tree/master/rails%2Flocale
下載

超簡單的步驟有
1. 把翻譯的那些yml檔放到, 想放的地方去, 教學都是放在 config/locales 下
2. 在application 做個 before_filter 設定
<br /># controllers/application.rb<br />before_filter :set_user_language<br />def set_user_language<br /> I18n.locale = 'zh-TW'<br />end<br />
3. 重啟server, 讓他load 一下, 設定檔

---

model 本身和column name 也可以用這樣的方式去做i18n <br /> 1. zh-TW:<br /> 2. activerecord:<br /> 3. models:<br /> 4. user: 會員<br /> 5. admin: 管理員<br /> 6. stocker: 股東<br /> 7. attributes:<br /> 8. user:<br /> 9. login: 帳號<br /> 10. password: 密碼<br /> 11. password_confirmation: 密碼確認<br />

rails I18n sample

railscast i18n
Rails 2.2.0 I18n 的使用筆記

一般的預設訊息可以到
http://github.com/svenfuchs/rails-i18n/tree/master/rails%2Flocale
下載

超簡單的步驟有
1. 把翻譯的那些yml檔放到, 想放的地方去, 教學都是放在 config/locales 下
2. 在application 做個 before_filter 設定
<br /># controllers/application.rb<br />before_filter :set_user_language<br />def set_user_language<br /> I18n.locale = 'zh-TW'<br />end<br />
3. 重啟server, 讓他load 一下, 設定檔

---

model 本身和column name 也可以用這樣的方式去做i18n <br /> 1. zh-TW:<br /> 2. activerecord:<br /> 3. models:<br /> 4. user: 會員<br /> 5. admin: 管理員<br /> 6. stocker: 股東<br /> 7. attributes:<br /> 8. user:<br /> 9. login: 帳號<br /> 10. password: 密碼<br /> 11. password_confirmation: 密碼確認<br />

rails execute sql

HowtoQueryTheDatabaseDirectly
<br />ActiveRecord::Base.connection.execute(sql)<br /><br />ActiveRecord::Base.connection.execute <<-SQL<br /> INSERT INTO clicks (item, location, created_at) VALUES('#{params[:item]}', '#{params[:loc]}', '#{Time.now.to_s(:db)}')<br />SQL<br /><br />

rails execute sql

HowtoQueryTheDatabaseDirectly
<br />ActiveRecord::Base.connection.execute(sql)<br /><br />ActiveRecord::Base.connection.execute <<-SQL<br /> INSERT INTO clicks (item, location, created_at) VALUES('#{params[:item]}', '#{params[:loc]}', '#{Time.now.to_s(:db)}')<br />SQL<br /><br />

jquery parse xml

jquery makes parsing xml easy
<br /> $(request.responseXML).find("marker").each(function() {<br /> var marker = $(this);<br /> var point = {<br /> marker.attr("lat"),<br /> marker.attr("lng")<br /> };<br /> });<br />

jquery parse xml

jquery makes parsing xml easy
<br /> $(request.responseXML).find("marker").each(function() {<br /> var marker = $(this);<br /> var point = {<br /> marker.attr("lat"),<br /> marker.attr("lng")<br /> };<br /> });<br />

google ajax library api

google ajax library api
some sample

<br /> <script src="http://www.google.com/jsapi"></script><br /> <script><br /> google.load("jquery", "1");<br /> google.load("jqueryui", "1");<br /> </script><br />

google ajax library api

google ajax library api
some sample

<br /> <script src="http://www.google.com/jsapi"></script><br /> <script><br /> google.load("jquery", "1");<br /> google.load("jqueryui", "1");<br /> </script><br />

using jquery in rails,jquery, rails,form,reset,escape,fn,plugin

jquery railscast
The jSkinny on jQuery
Myth #3: Rails forces you to use Prototype
jquery post
<br />$.post(url, data, callback, type) <br /><br />This is an easy way to send a simple POST request to a server without having to use the <br />more complex $.ajax function. It allows a single callback function to be specified that will <br />be executed when the request is complete (and only if the response has a successful <br />response code). The returned data format can be specified by the fourth paramater. If you <br />need to have both error and success callbacks, you may want to use $.ajax. $.post is a <br />(simplified) wrapper function for $.ajax.<br />
<br />//那要怎樣告訴controller 我們的format 是js勒 有兩種方法, 方法一<br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submit(function(){<br /> $.post($(this).attr("action")+'.js', $(this).serialize(), null, "script");<br /> return false;<br /> })<br /> })
ajaxSetup
<br />//第二種就是在發出ajax 前 把header 設一設<br />//ajaxSetup: Setup global settings for AJAX requests.<br />jQuery.ajaxSetup({ <br /> 'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}<br />})<br /><br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submit(function(){<br /> $.post($(this).attr("action"), $(this).serialize(), null, "script");<br /> return false;<br /> })<br /> }) <br />#comment controller<br /> def create<br /> @forum = params[:model].constantize.find(params[:id])<br /> params[:comments][:user_id] = @me.id<br /> if @forum.comments.create(params[:comments]) && @forum.is_a?(Forum)<br /> @forum.last_comment_time = @forum.comments.last.created_at<br /> @forum.save<br /> end<br /> <br /> @comment = @forum.comments.last<br /><br /> respond_to do |format|<br /> format.html {redirect_to :back}<br /> format.js<br /> end<br /> end
escape_javascript
form reset
<br />#create.js.erb<br />#rjs 是 prototype在用的, 這邊是jquery 所以不能用<br />#記得把 form reset 清空<br />$("#comments_list").append("<%= escape_javascript(render :partial => 'shared/comments', :locals => {:comment =>@comment })%>");<br />$("#new_forum_comment form")[0].reset();
jquery fn
<br />jQuery.fn.submitWithAjax = function() {<br /> this.submit(function() {<br /> $.post(this.action, $(this).serialize(), null, "script");<br /> return false;<br /> })<br />};<br /><br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submitWithAjax();<br /> })

using jquery in rails,jquery, rails,form,reset,escape,fn,plugin

jquery railscast
The jSkinny on jQuery
Myth #3: Rails forces you to use Prototype
jquery post
<br />$.post(url, data, callback, type) <br /><br />This is an easy way to send a simple POST request to a server without having to use the <br />more complex $.ajax function. It allows a single callback function to be specified that will <br />be executed when the request is complete (and only if the response has a successful <br />response code). The returned data format can be specified by the fourth paramater. If you <br />need to have both error and success callbacks, you may want to use $.ajax. $.post is a <br />(simplified) wrapper function for $.ajax.<br />
<br />//那要怎樣告訴controller 我們的format 是js勒 有兩種方法, 方法一<br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submit(function(){<br /> $.post($(this).attr("action")+'.js', $(this).serialize(), null, "script");<br /> return false;<br /> })<br /> })
ajaxSetup
<br />//第二種就是在發出ajax 前 把header 設一設<br />//ajaxSetup: Setup global settings for AJAX requests.<br />jQuery.ajaxSetup({ <br /> 'beforeSend': function(xhr) {xhr.setRequestHeader("Accept", "text/javascript")}<br />})<br /><br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submit(function(){<br /> $.post($(this).attr("action"), $(this).serialize(), null, "script");<br /> return false;<br /> })<br /> }) <br />#comment controller<br /> def create<br /> @forum = params[:model].constantize.find(params[:id])<br /> params[:comments][:user_id] = @me.id<br /> if @forum.comments.create(params[:comments]) && @forum.is_a?(Forum)<br /> @forum.last_comment_time = @forum.comments.last.created_at<br /> @forum.save<br /> end<br /> <br /> @comment = @forum.comments.last<br /><br /> respond_to do |format|<br /> format.html {redirect_to :back}<br /> format.js<br /> end<br /> end
escape_javascript
form reset
<br />#create.js.erb<br />#rjs 是 prototype在用的, 這邊是jquery 所以不能用<br />#記得把 form reset 清空<br />$("#comments_list").append("<%= escape_javascript(render :partial => 'shared/comments', :locals => {:comment =>@comment })%>");<br />$("#new_forum_comment form")[0].reset();
jquery fn
<br />jQuery.fn.submitWithAjax = function() {<br /> this.submit(function() {<br /> $.post(this.action, $(this).serialize(), null, "script");<br /> return false;<br /> })<br />};<br /><br /> $(document).ready(function(){<br /> $("#new_forum_comment form").submitWithAjax();<br /> })

swfobject,flash,swf

google code swfobject
Flash object attr
swfobject sample<br /> <div id='PR_ad#{name}'></div><br /><br /> <script><br /> var so = new SWFObject("/ad/#{name}", "PR_ad_flash", "#{width}", "#{height}", "8", "#ffffff");<br /> so.addParam('wmode', 'opaque');<br /> so.write(document.getElementById('PR_ad#{name}'));<br /> </script><br /><br />so.addVariable("arg1","test1"));<br />so.addParam("wmode", "transparent");<br />ar t1 = getQueryParamValue("arg1");<br />

---

update: 2009042
廣告追蹤常在用的clickTag 在flash7, 8 要換成clickTAG 才workso.addVariable("clickTAG", "#{goto_url(:p => ad_goyou_url(file.id, loc, file.redirect_url))}");

iconv,big5,utf8

iconv big5 to utf-8
<br />#在 FreeBSD 中將 big5 編碼轉成 utf-8 編碼格式<br /><br />#cd /usr/ports/converters/iconv # 安裝 iconv<br />#make install<br /><br />#iconv -l # 查看 iconv 支援那些編碼格式<br />#iconv -f BIG5 -t UTF-8 users.ldif > users.utf8.ldif # 轉檔<br />

using helpers in a controller

Using helpers in a controller: with_helpers
Rails: Using Helpers in Your Controller.

看不懂等級的mysql random

http://blog.gslin.org/archives/2008/07/02/1535/
http://blog.xdite.net/?p=598
http://jan.kneschke.de/projects/mysql/order-by-rand

iframe

淺入淺出 iframe (1)
淺入淺出 iframe (2)
iframe語法
html ifram tag
iframe wiki<br />#(iframe src="網站網址" width="780" height="30" marginwidth="0" #marginheight="0"<br /><br />#scrolling="no" frameborder="0" align="center")(/iframe)<br /><br />#(iframe)標記說明<br />#src="sample.htm" iframe指向的網頁位置<br />#width="450"height="200" iframe的寬和高<br />#scrolling="yes" 有沒有捲軸(yes 或 no)<br />#align="center" 對齊方式<br />#frameborder="0" 有沒有邊框，預設為有<br />

wbr,scan,regexp,$',$&,format

scan
wbr<br />=begin<br /> a = "cruel world"<br /> a.scan(/\w+/) #=> ["cruel", "world"]<br /> a.scan(/.../) #=> ["cru", "el ", "wor"]<br /> a.scan(/(...)/) #=> [["cru"], ["el "], ["wor"]]<br /> a.scan(/(..)(..)/) #=> [["cr", "ue"], ["l ", "wo"]]<br /><br /> $` before match string<br /> $' after match string<br /> $& entire match string<br />=end<br /><br /><br /><br />>> "111111222222333".scan(/....../).push($')<br />=> ["111111", "222222", "333"]<br /><br /> def wbr_by_6(long_word)<br /> if long_word.chars.size > 6<br /> long_word.scan(/....../).push($').map{|m| CGI.escapeHTML(m)}.join('<wbr>')<br /> else<br /> CGI.escapeHTML(long_word)<br /> end <br /> end <br /> <br /> def format_content(content)<br /> <br /> def sub_url(text) <br /> if text =~ URI.regexp && $&[0,4] == 'http'<br /> "#{$`}<a href='#{$&}'>#{wbr_by_6($&)}</a>#{sub_url($')}"<br /> else<br /> #content = CGI.escapeHTML(content)<br /> wbr_by_6(text)<br /> end<br /> end<br /><br /> sub_url(content)<br /> end<br />

form_for, form_tag,multipart,polymorphic

form_for api
form_tag versus form_for with :multipart => true<br />#form_for url的部份可以這樣寫<br /><% form_for([@ad_buyer, @ad_file], :html => {:multipart => true}) do |f| %><br /> <%= f.error_messages %><br /> <%= f.submit "Create" %><br /><% end %><br /><% form_tag ({:action => 'upload_file'}, :multipart => true) do %><br /> <p><label for="upload_file">Select File</label> :<br /> <%= file_field 'upload', 'datafile' %></p><br /> <%= submit_tag "Upload" %><br /><% end %><br />

default,time,format

Set the default date format for your Rails application
修改 Ruby 預設的 Time 顯示格式
<br />#加在environment.rb<br />ActiveSupport::CoreExtensions::Time::Conversions::DATE_FORMATS.merge!(<br /> :default => '%Y年%m月%d日',<br /> :date_time12 => "%m/%d/%Y %I:%M%p",<br /> :date_time24 => "%m/%d/%Y %H:%M"<br />)<br />

How to hide .rar files within picture files

How to hide .rar files within picture files

upload multi file

<br />#Controller：<br />def uploading<br /> files = []<br /> for i in 1..session[:files].to_i<br /> next if params[:gallery]["file_#{i}".to_sym].to_s.blank?<br /> files << Gallery.create(:file => params[:gallery]["file_#{i}".to_sym]).id.to_s<br /> end<br /> redirect_to :action => "images", :files => files.join("_")<br /> end<br /> <br /> def new_upload_field<br /> session[:files]+=1<br /> render :update do |page|<br /> page.insert_html :after, "file_fields", file_column_field("gallery", "file_#{session[:files]}") + "<br />"<br /> end<br /> end<br />
<br />#View：<br /><%= javascript_include_tag :defaults %><br /><% form_for(Gallery.new, :url => {:action => "uploading"}, :html => {:multipart => true}) do |f| -%><br /> <div id="file_fields"><br /> <%= file_column_field("gallery", "file_#{session[:files]}")%><%= link_to_remote("Add new", :url => {:action => "new_upload_field"}) %><br /> </div><br /> <%= f.submit("Upload") %><br /><% end %><br />

rails2.2.2 default error message

“ActiveRecord::Errors.default_error_messages”沒啦, 換成“I18n.translate(activerecord.errors.messages)”

validates_uniqueness_of, scope

validates_uniqueness_of api


<br /> #同樣的accout_id 不能有相同的 user_name<br /> class Person < ActiveRecord::Base<br /> validates_uniqueness_of :user_name, :scope => :account_id<br /> #不是new record 才會檢查<br /> validates_length_of :change_summary, :min => 10, :unless => :new_record?<br /> end<br />

[JavaScript] Firefox 在 DHTML 解析上的問題

[JavaScript] Firefox 在 DHTML 解析上的問題

<br /><table><br /><tr><td>測試</td></tr><br /><form action="" method="post"> <!-- form tag 別放在這種地方 --><br /><tr><br /><td><br /><div id="result"><br /></div><br /><input type="submit" value="送出" /><br /></td><br /></tr><br /></form><br /><input type="button" id="test" value="測試" /><br /></table><br />

js, getMonth, getDate, getDay, date

JavaScript Date Object Reference
<br /> getMonth() //get 出來的是0~11 0是1月 11是12月<br /> getDate() //get 出來的是日期<br /> getDay() //get 出來的是星期 0~6 Sunday is 0, Monday is 1<br />

merb, Hostname not supplied

<br />development: &defaults <br /> # These are the settings for repository :default<br /> host: localhost #MySQL server host <br /> adapter: mysql<br /> database: database_name<br /> username: XXX<br /> password: YYY<br />

merb, console, install webrat

webrat is required for merb-core app running in console
merb console require webrat
<br /> sudo gem install webrat<br /><br /> #webrat 需要一些lib, 像libxslt1-dev ,libxml-ruby, libxslt-ruby, libxml2, 如果沒有的話, 請<br />sudo apt-get install libxml-ruby libxslt-ruby libxml2 libxslt1-dev<br /><br />#(if nokogiri installs, the webrat gem should install and merb -i should work)<br />sudo gem install nokogiri<br />

do_mysql error,and how to track

<br />[lake@yhd2 ad_server]$ sudo gem install do_mysql<br />#在裝do_mysql gem時 又爆掉啦<br />Building native extensions. This could take a while...<br />ERROR: Error installing do_mysql:<br /> ERROR: Failed to build gem native extension.<br /><br /># 它是用 extconf.rb 這個file 去產生makfile<br />/usr/local//bin/ruby extconf.rb install do_mysql<br />checking for mysql.h... yes<br />checking for main() in -lmysqlclient... no #找不到<br />checking for mysql_query()... no #又找不到<br />checking for mysql_ssl_set()... no #通通找不到<br />creating Makefile #東西通通找不到, build makefile 當然就爆啦<br /><br />make<br />gcc -I. -I. -I/usr/local//lib/ruby/1.8/i686-linux -I. -DHAVE_MYSQL_H -I/usr/include/mysql -g -pipe -m32 -march<br />=i386 -mtune=pentium4 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fPIC -g -O<br />2 -fPIC -Wall -c do_mysql_ext.c<br />gcc -shared -rdynamic -Wl,-export-dynamic -L'/usr/local//lib' -Wl,-R'/usr/local//lib' -o do_mysql_ext.so do_m<br />ysql_ext.o -Wl,-R -Wl,/usr/local//lib -L/usr/local//lib -L. -lruby -L/usr/lib/mysql -lmysqlclient -lz -lcrypt <br />-lnsl -lm -L/usr/lib -lssl -lcrypto -lpthread -ldl -lcrypt -lm -lc<br />/usr/bin/ld: cannot find -lmysqlclient<br />collect2: ld returned 1 exit status<br />make: *** [do_mysql_ext.so] Error 1<br /><br /># gem file 還是有留在這, 從上面知道makefile 有問題, 所以要去找要生它的人, 從上面知道是extconf.rb 這個檔案, 從下面應該知道它應該在/usr/local/lib/ruby/gems/1.8/gems/do_mysql-0.9.9 下, 所以去他下面找<br />Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/do_mysql-0.9.9 for inspection.<br />Results logged to /usr/local/lib/ruby/gems/1.8/gems/do_mysql-0.9.9/ext/gem_make.out<br /><br /># 在 extconf.rb file 裡 , 發現了這句話<br /><br /># Allow overriding path to mysql_config on command line using:<br /># ruby extconf.rb --with-mysql-config=/path/to/mysql_config<br /><br />#很明顯告訴我們, 如果path 不同要自己下參數啦<br /><br /># 那現在就是要找mysql_config, 有幾種方法<br /># 1. which mysql_config , 但這很容易只是找到path, 而不是真正安裝的地方<br /># 2. pa aux | grep mysqld, 查一下在那邊跑就知道啦<br /># 3. sudo find / -name 'mysql_config', 最後不行就只好find 下去啦, 不過可以 /usr/bin 和 /usr/local/bin 這兩個下面先找, 十之八久都是裝在這邊<br /><br />#找到之後, 參數填好 就給他跑下去啦<br />sudo gem install do_mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config<br /><br />#打完 收工<br />Building native extensions. This could take a while...<br />Successfully installed do_mysql-0.9.9<br />1 gem installed<br /><br />

Adding a Directory to the Path, export, command

Adding a Directory to the Path

<br />export PATH='/usr/local/lib/ruby/gems/1.8/bin':$PATH<br />

form_for support namespace route

form_for api

<br />#namespaced routes, like admin_post_url:<br /><br /> <% form_for([:admin, @post]) do |f| %><br /> ...<br /> <% end %><br />

authenticate_or_request_with_http_basic

authenticate_or_request_with_http_basic <br /> before_filter :authenticate, :except => [:index , :show]<br /><br /> private<br /> def authenticate<br /> authenticate_or_request_with_http_basic do |name, password|<br /> name == 'lake' && password == 'flake'<br /> end<br /> end<br />

auto_discovery_link_tag, rss ,atom

auto_discovery_link_tag
#Returns a link tag that browsers and news readers can use to auto-detect an RSS or ATOM feed. The type can either be :rss (default) or :atom. Control the link options in url_for format using the url_options. You can modify the LINK tag itself in tag_options.<br /><br /> auto_discovery_link_tag(:rss, {:action => "feed"}, {:title => "My RSS"}) # =><br /> <br /> auto_discovery_link_tag(:rss, {:controller => "news", :action => "feed"}) # =><br /> <br /> auto_discovery_link_tag(:rss, "http://www.example.com/feed.rss", {:title => "Example RSS"}) # =><br /> <br />

div_for

div_for api <% div_for(@person, :class => "foo") do %><br /> <%=h @person.name %><br /> <% end %> <br /> <br /> <div id="person_123" class="person foo"> Joe Bloggs </div>

What's New in Edge Rails: No More Formatted Routes

No More Formatted Routes # Old => New<br />formatted_article_path(article, :xml) => article_path(article, :format => :xml)<br />formatted_new_article_path(:json) => new_article_path(:format => :json)<br /># etc...

MySQL for Hosting Providers - how do they manage ?

MySQL for Hosting Providers - how do they manage ?

Computing 95 percentile in MySQL

Computing 95 percentile in MySQL

A quick way to get memcached status

http://www.mysqlperformanceblog.com/2008/11/26/a-quick-way-to-get-memcached-status/

echo stats | nc 127.0.0.1 11211

watch "echo stats | nc 127.0.0.1 11211"

超簡單 very simple merb upload file

http://blog.vixiom.com/2007/06/29/merb-on-air-drag-and-drop-multiple-file-upload/
http://iceskysl.1sters.com/?action=show&id=368&page=1
http://www.mikeperham.com/2007/10/02/file-uploads-in-merb-versus-rails/
<br />class Attachment<br /> include DataMapper::Resource<br /><br /> property :id, Serial<br /> property :filename, String<br />end<br />
<br />class Upload < Application<br /><br /> # ...and remember, everything returned from an action<br /> # goes to the client...<br /> def index <br /> render<br /> end<br /><br /> def upload<br /> puts params.inspect<br /> #new user file object<br /> @upload = Attachment.new<br /> @upload.filename = params[:file][:filename]<br /><br /> # save<br /> if @upload.save<br /> FileUtils.mv params[:file][:tempfile].path, "#{Merb.root}/public/upload/#{params[:file][:filename]}"<br /> else <br /> false<br /> end<br /> end<br />end<br />
<br /><%= form :action => url(:controller => "upload", :action => "upload") do %><br /> <%= file_field :file, :label => "Filename" %><br /> <%= submit "Create" %><br /><% end =%><br />

幹 竟然這樣寫

<br /> if request.xhr?<br /> headers["Content-Type"] = "text/javascript" # render js<br /> js = if uis.auth?<br /> "alert('#{message}'); window.location.reload();"<br /> elsif uis.errors.size > 0<br /> "alert('#{message}'); YouHolder.PartnerUser.set_im('#{uis.account}', '#{uis.im_provider}');"<br /> else<br /> "alert('#{message}'); YouHolder.PartnerUser.confirm_im('#{uis.account}', '#{uis.im_provider}');"<br /> end<br /> render :text => js<br /> else<br /> flash[:notice] = message<br /> redirect_to :action => :authenticate<br /> end<br />

How to reset a lost mysql root password

http://www.simplehelp.net/2008/11/26/how-to-reset-a-lost-mysql-root-password/

upload file in rails

http://www.tutorialspoint.com/ruby-on-rails/rails-file-uploading.htm
http://manuals.rubyonrails.com/read/chapter/79
http://manuals.rubyonrails.com/read/chapter/78
http://manuals.rubyonrails.com/read/chapter/77
http://www.practicalecommerce.com/blogs/post/432-Multiple-Attachments-in-Rails
http://izumi.plan99.net/blog/index.php/2007/04/07/ruby-on-railss-handling-of-uploaded-files/

About the uploaded file object

While the uploaded file is a special beast,it is not difficult to use. The object
rails receives are processed by a CGI object. The object that CGI returns to Rails
isn’t actually a file object, but it’s close enough for our purposes.
Details from the CGI class documentation

... the value is not a string, but an IO object, either an IOString for small files,
or a Tempfile for larger ones.
This object also has the additional singleton methods:
local_path(): the path of the uploaded file on the local filesystem
original_filename(): the name of the file on the client computer 
content_type(): the content type of the file

<br />class UserController < ApplicationController<br /> ...<br /> def save_picture<br /> @user = User.find(@params['user']['id'])<br /> File.open("#{RAILS_ROOT}/public/pictures/#{@user.id}.jpg", "wb") do |f| <br /> f.write(@params['picture_file'].read)<br /> end<br /> redirect_to :action => 'show', :id => @user.id<br /> end<br /> ...<br />end<br />
<br />class Content < ActiveRecord::Base<br /> def file=(incomming_file)<br /> @temp_file = incomming_file<br /> @filename = incomming_file.original_filename<br /> @content_type = incomming_file.content_type<br /> end<br /><br /> def after_save<br /> if @temp_file<br /> logger.debug("saving '#{RAILS_ROOT}/media/#{@filename}'")<br /> File.open("#{RAILS_ROOT}/media/#{@filename}", "wb") do |f| <br /> f.write(@temp_file.read)<br /> end<br /> end<br /> end<br /> end<br />
<br />def sanitize_filename(file_name)<br /> # get only the filename, not the whole path (from IE)<br /> just_filename = File.basename(file_name) <br /> # replace all none alphanumeric, underscore or perioids with underscore<br /> just_filename.sub(/[^\w\.\-]/,'_') <br />end<br />

yaml,load_file

http://ithelp.ithome.com.tw/question/10012281

<br />./script/console<br />Loading development environment (Rails 2.1.1)<br />=>> a=[1,2,3]<br />=> [1, 2, 3]<br />>> a.to_yaml<br />=> "--- \n- 1\n- 2\n- 3\n"<br />>> b=a.to_yaml<br />=> "--- \n- 1\n- 2\n- 3\n"<br />>> YAML::load(b)<br />=> [1, 2, 3]<br />>> c=[2,3,4,5]<br />=> [2, 3, 4, 5]<br />>> c - YAML::load(b)<br />=> [4, 5]<br />