added sort for users list

app/controllers/admin/user_controller.rb

@@ -2,7 +2,8 @@
 module Admin
   class UserController < AdminController
     def index
-      @users = policy_scope User.order(:name)
+      @users = policy_scope User.order("#{sort_column} #{sort_direction}")
+               .page(params[:page])
     end
 
     def new
@@ -52,5 +53,9 @@ module Admin
       def user_params
         params.require(:user).permit(policy(User).permitted_attributes)
       end
+
+      def sort_column
+        User.column_names.include?(params[:sort]) ? params[:sort] : 'name'
+      end
   end
 end

app/views/admin/user/_table_list.html.erb

@@ -1,8 +1,8 @@
 <table cellspacing="0" cellpadding="0">
   <tr>
-    <th>User</th>
-    <th>Email</th>
-    <th>Role</th>
+    <th><%= sortable "name", "User" %></th>
+    <th><%= sortable "email" %></th>
+    <th><%= sortable "role" %></th>
     <th></th>
   </tr>