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..