Render custom template for 404s

four_oh_four.rb

module FourOhFour
  extend ActiveSupport::Concern

  included do
    rescue_from ActiveRecord::RecordNotFound, ActionController::RoutingError, with: :render_404
  end

  def render_404
    render template: 'error_pages/404', status: :not_found, format: [:html] and return false
  end
end