update

app/controllers/users/clas_controller.rb

@@ -23,7 +23,7 @@ class Users::ClasController <  Users::BaseController
     end
 
     def destroy
-        @user_cla = current_user.user_clas.find_by(cla_id: params[:cla_id])
+        @user_cla = current_user.user_clas.find params[:id]
         @user_cla.update_attributes(state: 2)
         render_ok
     end