Saving custom fields in devise User model in rails 4

Question

I made a devise User model and added additional fields to it. When I create and account everything works fine, only with email, pw and pw conf.

I then want to allow the

Answer 1

In Rails 4.2, this is how I did. I have User Model on which devise is applied.
Use this command "rails generate devise:controllers users" to generate custom controllers.
I have added "username" name attribute to my User Model

In my controller

class Users::RegistrationsController < Devise::RegistrationsController
 before_filter :configure_sign_up_params, only: [:create]
 before_filter :configure_account_update_params, only: [:update]
 #rest of code as generated

   protected

    # If you have extra params to permit, append them to the sanitizer.
    def configure_sign_up_params
      devise_parameter_sanitizer.for(:sign_up) << :username
    end

   # If you have extra params to permit, append them to the sanitizer.
   def configure_account_update_params
     devise_parameter_sanitizer.for(:account_update) << :username
   end

In Routes

devise_for :users, controllers: {registrations: "users/registrations"}