Let’s use the ‘twitter clone’ example from the rails tutorial. The Twitter registration is different, because it not only requires an email and password but also a username. Here is how you can add this extra field to your code:

First, let’s import the default devise views into our project:

rails g devise:views

This will create a folder in app/views/devise/ containing all the views required for (including the ones for registration that we will modify).

Create a new file and open it:

touch app/controllers/registrations_controller.rb

Inside the file, copy the following contents:

class RegistrationsController < Devise::RegistrationsController

  private

  def sign_up_params
    params.require(:user).permit(:username, :email, :password, :password_confirmation)
  end

  def account_update_params
    params.require(:user).permit(:username, :email, :password, :password_confirmation, :current_password)
  end

end

Now, let’s change the config/routes.rb file to use the new controller:

devise_for :users, controllers: { registrations: 'registrations'}

Finally, open the ‘New Sign Up’ view (app/views/devise/registrations/new.html.erb) and add the extra field:

<div class="field">
  <%= f.label :username %><br />
  <%= f.text_field :username %>
</div>

Done! Restart your server and visit the sign up page (generally /users/sign_up).

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