Implement server-side rendering of datatables in users#index

app/controllers/admin/users_controller.rb

@@ -7,7 +7,10 @@ module Admin
     end
 
     def index
-      @users = User.all
+      respond_to do |format|
+        format.html
+        format.json { render json: UsersDatatable.new(view_context) }
+      end
     end
 
     def show