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Adding Authentication with Devise and set up Devise, including generating a Devise User model class (as depicted in Figure 5) along with the sign-up and sign-in pages. Create the sign-in/sign-out/sign-up hyperlinks. Restrict access to controller actions to only users who are signed in.

In this article, we will look at the steps needed to integrate Devise into a Ruby on Rails application. Step 1: Add Devise to the Gemfile. ... Step 2: Run Devise Generator. ... Step 3: Generate Devise Models. ... Step 4: Update Routes. ... Step 5: Add Devise Views. ... Step 6: Update Application Controller.

If the authentication details are valid, Warden will store the user in a Warden::Proxy object stored as a request environment variable at request. env['warden'] . Later, this object is used by Devise to know the status of the authentication.

The Devise gem is an authentication solution for Ruby on Rails applications; it helps you set up production-ready user authentication in your projects without having to do everything on your own.

Devise offers authentication helper functions for Rails controllers and views. They include: authenticate_user! : This helper function denies controller access to unauthenticated users. user_signed_in? : This returns a boolean that indicates whether or not a user is signed in.

Devise is an excellent authentication system made for Rails that allows us to easily drop-in User functionality into our project. Add Devise to your Gemfile and run bundle .

Devise is the cornerstone gem for Ruby on Rails authentication. With Devise, creating a User that can log in and out of your application is so simple because Devise takes care of all the controllers necessary for user creation ( users_controller ) and for user sessions ( users_sessions_controller ).

Devise will provide also the option: to verify if a user is signed in by using the following helper: user_signed_in? to access the current signed-in user by using: current_user. or to access the session via: user_session.