使用 :collection 时，如何减少 Rails 中此 VIEW 中的循环数量？

Question

我正在使用 :collection 来浏览属于给定营销活动的所有联系人。

但在该活动中，我检查了三个不同的模型（每个模型都有自己的部分）。感觉就像我正在浏览 3 次联系人列表。我怎样才能让这个变得更精简？

<h2>These are past due:</h2>

<% @campaigns.each do |campaign| %>
   <h3>Campaign: <%= link_to campaign.name, campaign %></h3>
   <strong>Emails in this Campaign:</strong>
   <% for email in campaign.emails %>
      <h4><%= link_to email.title, email  %> <%= email.days %> days</h4>

         <% @contacts= campaign.contacts.find(:all, :order => "date_entered ASC" )%> <!--contacts collection-->   

         <!-- render the information for each contact -->
         <%= render :partial => "contact_email",
                    :collection => @contacts,
                    :locals => {:email => email} %>
    <% end %>

       Calls in this Campaign:
       <% for call in campaign.calls %>
          <h4><%= link_to call.title, call  %> <%= call.days %> days</h4>
          <% @contacts= campaign.contacts.find(:all, :order => "date_entered ASC" )%> <!--contacts collection-->      
         <!-- render the information for each contact -->
         <%= render :partial => "contact_call",
                    :collection => @contacts,
                    :locals => {:call => call} %>
       <% end %>

       Letters in this Campaign:
       <% for letter in campaign.letters %>
          <h4><%= link_to letter.title, letter  %> <%= letter.days %> days</h4>
          <% @contacts= campaign.contacts.find(:all, :order => "date_entered ASC" )%> <!--contacts collection-->      
         <!-- render the information for each contact -->
         <%= render :partial => "contact_letter",
                    :collection => @contacts,
                    :locals => {:letter => letter} %>
       <% end %>
<% end %>

Answer 1

如果您希望它们按类型（联系人、电子邮件、信件等）排序，我认为您无法提取更有效的内容（仅将重复代码提取到单独的部分中并在那里渲染集合：

<% @contacts = campaign.contacts.find(...) %>
<% [:emails, :calls, :letters].each do |asset| %>
  <h4><%= asset.humanize %> in this campaign</h4>
  <%= render :partial => 'asset', :collection => campaign.send(asset), :as => :asset %>
<% end %> 

然后在 < code>_asset 部分，您可以使用 asset 变量来引用当前反对者并通过 @contacts 实例变量联系联系人。