Add Custom Field/Column to Devise with Rails 4

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Once your model has its full_name attribute, you will have to configure permitted parameters for the #sign_up and #account_update Devise actions.

class ApplicationController < ActionController::Base
  before_action :configure_devise_permitted_parameters, if: :devise_controller?

  protected

  def configure_devise_permitted_parameters
    registration_params = [:full_name, :email, :password, :password_confirmation]

    if params[:action] == 'update'
      devise_parameter_sanitizer.for(:account_update) do 
        |u| u.permit(registration_params << :current_password)
      end
    elsif params[:action] == 'create'
      devise_parameter_sanitizer.for(:sign_up) do 
        |u| u.permit(registration_params) 
      end
    end
  end

end

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