How to create a connection with Gem Devise

Devise is a Gem service created to make it easier to log in and out of an application.

Implementation steps

1.Create a new rails project and generate a database:

$ rails new devise

$ rake db:create

2. Add a gem template to the gemfile

 gem 'devise'

3. Install the device

$ bundle install

$ rails generate devise:install

4. Create a “user” template device

$ rails generate devise User

5. Run the migration

$ rake db:migrate

6. Generate a view for login and registration

$ rails generate devise:views users

7. Generate Controller Design Users

$ rails generate devise:controllers users

8. Configure routes for login and registration

 #config/routes.rb
  devise_for :users, controllers: { sessions: 'users/sessions' }   
  devise_scope :user do
    get 'sign_in', to: 'devise/sessions#new'
    get '/users/sign_out' => 'devise/sessions#destroy'
  end
  resources :homes
  root to: 'homes#index'

9. Generate controller home and add below code

$ rails g controller homes

 #controllers/homes_controller.rb
  class HomesController < ActionController::Base
    before_action :authenticate_user!
    def index
    end
  end

create a houses file in the views folder then add the file index.html.erb

 #views/homes/index.html.erb
 <h3>Hello World</h3>
 <%= link_to "Logout", destroy_user_session_path, method: :delete, :class => 'navbar-link'  %>

10.Run the server

$ rails s

11. Open URL

http://localhost:3000/users/sign_in

more or less the result will be like this:

registration form:

login form:

For more information about Gem Devise, you can click on the link below: