Haml的每个循环？

Question

我有这个each循环:(haml)

- @deals.each do |a|
     .slide
        %a{:href => "#"}
         - a.attachments.each do |a|
           = image_tag(a.file.url, :height =>"325px", :width =>"650px" )
            .caption{:style => "bottom:0"} 
              = a.description

因为@deals是3个表(模型)的组合查询,我用它polymorphic_path来生成图像的链接.

- @deals.each do |a|
     .slide
        %a{:href => "#"}
         - a.attachments.each do |a|
           = image_tag(a.file.url, :height =>"325px", :width =>"650px" ), polymorphic_path(@region, @city, a)
            .caption{:style => "bottom:0"} 
              = a.description

但这会产生region_city_attachment_path不正确的结果.第一个每个循环a变量存储正确的值,但我怎么能在第二个循环中reach的第一个a变量each？

Answer 1

请给它另一个名字.

- @deals.each do |a|
     .slide
        %a{:href => "#"}
         - a.attachments.each do |b|
           = image_tag(a.file.url, :height =>"325px", :width =>"650px" ), polymorphic_path(@region, @city, b)
            .caption{:style => "bottom:0"} 
              = a.description

Answer 2

你在使用变量名时应该更清楚,做类似的事情

- @deals.each do |deal|
  .slide
    %a{:href => "#"}
      - deal.attachments.each do |attachment|
        ..

当你可以编写一个更易读的代码时,使用诸如"a"/"b"/"x"之类的名称是一个非常糟糕的做法