Way to store "first_name", ... with ruby on rails 4

# 1) Be sure to have added first_name, last_name and 
# profile_name to the user migration file
class DeviseCreateUsers < ActiveRecord::Migration 
  def change 
    create_table(:users) do |t| 
      t.string :first_name 
      t.string :last_name 
      t.string :profile_name 
    end 
  end 
end 

# 2) Create a new file called registrations_controller.rb in the 
# app/controllers directory. In this file u add the following code 
class RegistrationsController < Devise::RegistrationsController
  private
  def sign_up_params 
    params.require(:user).permit(
      :first_name, 
      :last_name, 
      :profile_name, 
      :email, 
      :password, 
      :password_confirmation
    ) 
  end

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

# 3) Finally you have to change your **routes.rb** file 
Rails.application.routes.draw do 
  devise_for :users, :controllers => { 
    registrations: 'registrations' 
  } 
  resources :statuses root to: 'statuses#index' 
end