Rails - Oct 2012 - Routing error in rails

In my controller I have

  def update_project_dates
       p "It is end date....."
      @user=User.find(params[:user])
       @projects=Project.find_all_by_user_id(@user)

   end

In the view page (only some part of the code is copied and pasted)

 eventDrop: function()
             {
               $.ajax({
                 url:''/update_project_dates/'',
                 success:function(data)
                 {
                 alert("Hello");
                 }
               })
             },

In my routes.rb I have mentioned

 match
 ''/update_project_dates''=>''users#update_project_dates'',:method=>:get
 get ''update_project_dates''


But When the ajax request goes, I get the routing error as
<h1>Routing Error</h1>
<p><pre>uninitialized constant UsersController</pre></p>

Where am I doing wrong here...Please help..

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