undefined method `for' for #<Devise::ParameterSanitizer:0x007fe4c2821988> Did you mean? fork

  }
elsif params[:action] == 'create'
  devise_parameter_sanitizer.for(:sign_up) {
    |u| u.permit(registration_params)
  }
end

class ApplicationController < ActionController::Base
protect_from_forgery with: :exception
before_action :configure_devise_permitted_parameters, if: :devise_controller?
protected
def configure_devise_permitted_parameters
registration_params = [:first_name,:last_name, :address,:gender, :DOB, :email, :password, :password_confirmation, :image, :thumb, :medium]

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

end