Unpermitted Parameters adding new fields to Devise in rails 4.0

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The accepted solution is good enough, but I see two problems: 1) All the controllers will check if the current controller is the devise controller (if: :devise_controller?) and 2) We need to write all the acceptable parameters in the method (...for(:sign_up) {|u| u.permit(:bio, :name)}), even the :email, :password and so on.

I think that a more elegant solution could be:

# app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < Devise::RegistrationsController
  before_filter :configure_permitted_parameters

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up).push(:name, :phone, :organization)
  end
end

# config/routes.rb
devise_for :users, :controllers => { :registrations => "users/registrations" }

NOTE: Updates for Rails 4.2+

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