application_controller.rb

class ApplicationController < ActionController::Base

  rescue_from ActionController::RoutingError, ActionController::UnknownController, ::AbstractController::ActionNotFound, ActiveRecord::RecordNotFound, with: lambda { |exception| render_error 404, exception }

  def render_error(status, exception)
    @return_path = determine_return_path
    @status_code = status
    @message = I18n.t("errors.not_found")
    respond_to do |format|
      format.html { render template: "shared/exception", layout: 'application', status: @status_code }
      format.all { render nothing: true, status: status }
    end
  end


end