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Rails -v 3.2.3

我试图在我不断得到的视图中显示表格内的链接 NoMethodError in Links#submissions , views/links/submissions.html.erb where line #10 raised: undefined method "each" for nil:NilClass

这是我的submission.htm.erb

<table>
<% @links.each do |link| %>
  <tr valign = "top">
    <td>
      <%= link_to_remote "Up",
                        :url => { :action => 'modify_points',
                               :id => link.id,
                               :by => 1 },
                    :update => "link" + link.id.to_s %>
</td>
<td>
  <%= link_to_remote "Down",
                    :url => { :action => 'modify_points',
                              :id => link.id,
                              :by => -1 },
                    :update => "link" + link.id.to_s %>

</td>

<td>
  <b> <a href="<%= link.url %>"> <%= link.description %> </a> </b>
  (<%= if link.url =~ /(:\/\/) ([^\/]*)/ then $2 else "wrong URL" end %>) <br/>
  <span id="link"><%= link.id.to_s %>"%><%= link.points %> </span>
  points posted <%= time_ago_in_words link.created_at %> ago
</td>

  </tr>
<% end %>
</table>

我的问题是....如果没有链接，我是否需要编写一些代码？这就是我收到此错误消息的原因吗？

4

1 回答 1

1

是的，如果您不知道上下文中是否存在@links，那么安全总比抱歉好。

<% if @links.present? %>
  <% @links.each do |link|
    etc 
  <% end %>
<% end %>

等等......也许有一些更好的红宝石速记......如果是这样，我相信有人会提醒我们。:)

于 2012-06-09T03:47:16.317 回答