Adding Custom Fields to Devise

Before doing anything, please check the versions of the gem files:

gem 'rails', '~> 5.1.4'
gem 'devise', '~> 4.4.0'

Disclaimer - This solution may not work with older versions of rails and devise. Versions listed above were the latest versions of gems which I was using at the time of creation and tests. (10 Jan 2018)

Step 01: Install & Generate Devise

If you do not know the install process, please visit Getting Started part of Devise README.md

Step 02: Change code in devise.rb

In order to visually see all the new fields and alterations of login, sign up etc pages, we need to first change the following code in: config/initializers/devise.rb

config.scoped_views = true

Step 03: Generate a migration file for model created with Devise

bash

$ rails generate migration add_name_to_users name:string

Step 04: Check Migration file

_db/migrate/....add_name_to_users.rb

class AddNameToUsers < ActiveRecord: :Migration
     def change
          add_column :users, :name, :string
     end
end

Step 05: Migrate Database

bash

$ rake: db:migrate

Step 06: Update code in ApplicationController

Similar to permitting parameters, we need to create permitting parameters to devise model as well.
app/controllers/application_controller.rb

class ApplicationController < ActionController: :Base
     protect_from_forgery with: :exception

     before_action :configure_permitted_parameters, if: :devise_controller?

     protected

          def configure_permitted_parameters
               devise_parameter_sanitizer.permit(:sign_up) { |u| u.permit(:name, :email, :password)}

               devise_parameter_sanitizer.permit(:account_update) { |u| u.permit(:name, :email, :password, :current_password)}
          end

end

Step 07: Register & Edit Users with custom fields

Add new custom fields inside html.erb files. app/views/layout/index.html.erb

<%= link_to 'Edit Profile', edit_user_registration_path %>

app/views/users(or devise)/registrations/new.html.erb

<div>
     <%= f.label :name %><br />
     <%= f.text_field :name, autofocus: true %>
</div>

app/views/users(or devise)/registrations/edit.html.erb

<div>
     <%= f.label :name %><br />
     <%= f.text_field :name, autofocus: true %>
</div>

withoutwax/custom_fields_devise.markdown