Creating a Rails 7 application with Devise and roles

1. Generate a new Rails application called “devise_roles”:

rails new devise_roles

2. Changes to the application directory:

cd devise_roles

3. Add the Devise gem to your Gemfile:

bundle add devise

4. Run the Devise installation generator:

rails g devise:install

5. Generate a User model with a role attribute:

rails g devise User role:integer

6. Open the generated migration file for the User model (`db/migrate/<timestamp>_devise_create_users.rb`) and set the default role to 0:

t.integer :role, default: 0

7. Run the database migration:

rails db:migrate

8. Generate a controller called “pages” with an action called “home”:

rails g controller pages home

9. Update the `config/routes.rb` file to set the root to the pages#index action:

root 'pages#index'

10. Create a view file for the home action (`app/views/pages/home.html.erb`) with the following content:

<% if current_user %>
       <p>Hello <%= current_user&.email %></p><br>
       <p>You are Role: <%= current_user&.role %></p><br>
       <% if current_user.admin? %>
         <p>User Total count <%= User.count %></p>
       <% end %>
       <%= link_to "Log Out", destroy_user_session_path, 'data-turbo-method': :delete %>
     <% else %>
       <p>You are not signed in</p>
       <p>
         <%= link_to "Sign up", new_user_registration_path %><br>
         <%= link_to "Login", new_user_session_path %>
       </p>
     <% end %>11. Generate the Devise views for customization:

rails g devise:views

12. Update the sign-up form (`app/views/devise/registrations/new.html.erb`) to include `data-turbo: false` for the submit button:

<%= f.submit "Sign up", data: { turbo: false } %>

13. Update the session destroy link in the home view (`/app/views/devise/sessions/new.html.erb`) to include `’data-turbo-method’: :delete`:

<%= link_to "Log Out", destroy_user_session_path, 'data-turbo-method': :delete %>14. Add role enumeration to the User model (`app/models/user.rb`) using the `enum` macro and set a default role using the `after_initialize` callback:

enum role: [:user, :moderator, :admin]

 after_initialize :set_default_role, if: :new_record?

 def set_default_role
   self.role ||= :user
 end