contests delete routes error

app/views/layouts/base_newcontest.html.erb

@@ -82,7 +82,7 @@
 													      </tr>
 													      <tr colspan='3'>
 													      	<td valign="middle">
-														     <span style="display:block; margin-left:20px;"><%= link_to l(:label_contest_delete), {:controller => 'contests', :action => 'destroy_contest', :id => @contest},  data: { confirm: '你确定要删除该竞赛吗?' } %></span>									
+														     <span style="display:block; margin-left:20px;"><%= link_to l(:label_contest_delete), {:controller => 'contests', :action => 'destroy_contest', :id => @contest},  data: { confirm: '你确定要删除该竞赛吗?' }, method: :delete %></span>									
 													      	</td>
 													      </tr>													      
 													      <% end %> 

config/routes.rb

@@ -80,6 +80,7 @@ RedmineApp::Application.routes.draw do
       match 'new'                , via: :post
     end
     member do
+      delete 'destroy_contest'
       match 'add_softapplication'
       match 'update_contest'             , via: [:put]
       match 'show_contest'               , via: :get