做一些增量

Question

我有這樣的靜態代碼：

%a#carousel-selector-0.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=one"}/ 
      %li.span2 
      %a#carousel-selector-1.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=two"}/ 
      %li.span2 
      %a#carousel-selector-2.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=three"}/ 
      %li.span2 
      %a#carousel-selector-3.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=four"}/ 
      %li.span2 
      %a#carousel-selector-4.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=five"}/ 
      %li.span2 
      %a#carousel-selector-5.thumbnail 
       %img{:src => "http://placehold.it/170x100&text=six"}/ 

這是我的每個循環，使其從DB

- @house.attachments.each do |a| 
    = link_to(image_tag(a.file.url), :id => "carousel-selector-{number}", :class => "thumbnail") 

我怎樣才能使{}數量增加動態？就像在靜態的例子中一樣？

Answer 1

試試這個：

- @house.attachments.each_with_index do |a,i| 
    = link_to(image_tag(a.file.url), :id => "carousel-selector-#{i}", :class => "thumbnail")