with_scope and with_options

with_scope 和 with_options的用法
<br /> def self.find_old_books<br /> with_scope :find => {:conditions => "created_at < now()"} do <br /> find(:all)<br /> end<br /> end<br /> #上下的結果是一樣的<br /> def self.find_old_books<br /> with_options :conditions => "created_at < now()" do |old|<br /> old.find(:all)<br /> end<br /> end<br />