Admin User List

In this article, we will make a lists of users for our admin page. At the same time, we will configure our website redirect us to specific pages depending on the genre of the user upon sign-in.

Admin::User Page

Let’s begin by making route resources :users under admin namespace.

# routes.rb

Rails.application.routes.draw do
  # ...

+ namespace :admin do
+   resources :users
+ end
end

Then generate controller.

 root@0122:/usr/src/app# rails g controller 'admin/users' index --skip-routes
      create  app/controllers/admin/users_controller.rb
      invoke  erb
      create    app/views/admin/users
      create    app/views/admin/users/index.html.erb
      invoke  helper
      create    app/helpers/admin/users_helper.rb

Get all users on your Admin::UsersConroller#index.

# app/controllers/admin/users_controller.rb

class Admin::UsersController < ApplicationController
  def index
+   @users = User.page params[:page]
  end
end

Modify content of admin/users index view, display users in <table>.

<!-- app/views/admin/users/index.html.erb -->

- <h1>Admin::Users#index</h1>
- <p>Find me in app/views/admin/users/index.html.erb</p>
+ <h1>Admin Users</h1>
+ <table class="table table-striped table-hover">
+   <thead>
+   <td>id</td>
+   <td>email</td>
+   <td>genre</td>
+   </thead>
+   <% @users.each do |user| %>
+   <tr>
+     <td><%= user.id %></td>
+     <td><%= user.email %></td>
+     <td><%= user.genre %></td>
+   </tr>
+   <% end %>
+ </table>
+
+ <%= paginate @users %>

Redirect Path

All that’s left now is changing the redirect path after user sign-in/sign-up.

Read Carefully

Devise have a method after_sign_in_path_for and after_sign_up_path_for that takes up a resource argument. These methods let’s the developer decide where to redirect the user after they sign-in or sign-up.

Add after_sign_in_path_for and after_sign_up_path_for methods on our ApplicationController.

# app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
+ def after_sign_up_path_for(resource)
+   after_sign_in_path_for(resource) if is_navigational_format?
+ end
+
+ def after_sign_in_path_for(resource)
+   if current_user.admin?
+     admin_users_path
+   else
+     posts_path
+   end
+ end
end

User will now be redirected Admin Users page if their genre is admin, else they will be redirected to Posts page.

Read Carefully

Method is_navigational_format? is a devise controller helper that returns a boolean. It returns true if the format of request is supported by Rails, otherwise it will return false.

That’s all for Admin Users List.