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尝试访问原因索引页面时

NameError in Reasons#index

Showing /home/alec/workspace/rails/nwis/app/views/reasons/index.html.erb where line #26 raised:

undefined local variable or method `upvote_reason' for #<#<Class:0x000000023d9940>:0x000000023d3298>
Extracted source (around line #26):

23:     <td><%= link_to 'Show', reason %></td>
24:     <td><%= link_to 'Edit', edit_reason_path(reason) %></td>
25:     <td><%= link_to 'Destroy', reason, :confirm => 'Are you sure?', :method => :delete %></td>
26: <td><%= link_to "Vote up", :action => upvote_reason, :id => reason.id %></td>
27:   </tr>
28: <% end %>
29: </table>
Rails.root: /home/alec/workspace/rails/nwis

Application Trace | Framework Trace | Full Trace
app/views/reasons/index.html.erb:26:in `block in _app_views_reasons_index_html_erb__2084449067598068298_18776480__4598497200926455905'
app/views/reasons/index.html.erb:16:in `each'
app/views/reasons/index.html.erb:16:in `_app_views_reasons_index_html_erb__2084449067598068298_18776480__4598497200926455905'
app/controllers/reasons_controller.rb:7:in `index'

视图中的行：

<td><%= link_to "Vote up", :action => upvote_reason, :id => reason.id %></td>

控制器中的方法：

def upvote_reason
    @reason = Reason.find(params[:id])
    @reason.upvote += 1
    @reason.save
    redirect_to reason_path
end

诚然，我是 Rails 的新手，但我觉得我快要点击它了，一旦我能弄清楚如何与控制器正确交互。如果有人可以为我指出正确的方向来很好地涵盖该主题的教程，我很乐意检查它是否太基本的问题。

4

1 回答 1

3

在它前面加上一个冒号将它变成一个符号，或者在它周围加上引号：

:action => :upvote_reason

或者

:action => "upvote_reason"

此外，您需要更新您的路线。而你目前可能只是resources :reasons想要这样的东西：

resources :reasons do
  get "upvote_reason", :on => :member
end

事实上，添加这条路由后，你可以只使用命名路由而不是你的:action和:id参数：

<%= link_to "Vote up", upvote_reason_reason_path(reason) %>

（如果您只是将您的upvote_reason操作重命名为upvote，那么这将变为upvote_reason_path(reason)）

于 2011-05-02T03:16:17.060 回答