app/controllers/application_controller.rb

#
# Licensed to the Apache Software Foundation (ASF) under one
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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  layout :layout_by_resource

  before_filter :configure_permitted_parameters, if: :devise_controller?

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:firstname, :lastname, :email, :password, :password_confirmation) }
    devise_parameter_sanitizer.for(:account_update) { |u| u.permit(:firstname, :lastname, :email, :password, :password_confirmation) }
  end

  def layout_by_resource
    if devise_controller?
      'devise'
    else
      'application'
    end
  end
end