Ruby on Rails的：渲染收藏

Question

我想显示在第一次循环的特定图像时，部分模板被调用，而不是休息：

view file: 

<% @categories.each do |category,i,category_locales| %> 
    <div class="featured_deals"> 
     <%= render :partial => "medium_deal", :collection => category_locales, :as => :deal_locale %> 
     </div> 
<% end %> 

medium_deal文件：

<% deal = deal_locale.deal %> 

<%= image_tag 'layout/featured_deal_left_blue.png', :style => 'float: left; padding-top: 11px;' %> 
# I only want this image to show for the FIRST element of category_locales, but not the rest. 

<div class="featured_deal_wrapper"> 
     Hello  
</div> 

我试过在第一个视图文件中传递一个计数器，但是直到“每个”再次通过它才会增加。

Answer 1

你应该能够做到这一点：

<% if deal_locale_counter == 0 %> 
    <%= image_tag 'layout/featured_deal_left_blue.png', :style => 'float: left; padding-top: 11px;' %> 
<% end %> 

参见：http://guides.rubyonrails.org/layouts_and_rendering.html#local-variables