ActionView

1. config.action_view.erb_trim_mode 可以修改預設的寫法
<br />config.action_view.erb_trim_mode = "%"<br /><br />#you could write something like<br />% 5.downto(1) do |i|<br /> <%= i %>... <br/><br />% end<br />

2. Grouped selection lists, 分組, p581
option_groups_from_collection_for_select

3.date and time fields
有些 prefix, order, discard_ooxx, include_blank 等好東西可以用

4 multiple models in a form p585
利用 fields_for
<br /> <fieldset><br /> <legend>Details...</legend><br /> <%= error_messages_for :details %><br /> <% fields_for :details do |detail| %><br /> SKU: <%= detail.text_field :sku %><br/><br /> Manufacturer: <%= detail.text_field :manufacturer %><br /> <% end %><br /> </fieldset><br /><br /> #儲存時要注意要兩個同時成功時才存, 所以利用 transaction 和 rescue,所以存的時候要用 !<br /><br /> def create<br /> @product = Product.new(params[:product])<br /> @details = Detail.new(params[:details])<br /> Product.transaction do<br /> @details.product = @product<br /> @product.save!<br /> @details.save!<br /> redirect_to :action => :show, :id => @product<br /> end<br /> rescue ActiveRecord::RecordInvalid => e<br /> @details.valid? # force checking of errors even if products failed<br /> render :action => :new<br /> end<br />