How to correctly translate the ActiveRecord::RecordNotFound exception?

Question

Ruby on Rails

There is such an exception interceptor:

rescue_from ActiveRecord::RecordNotFound do |exception|
    render json: {
      error: exception.message
    }, status: 404
end

When there is no record with the required id in the database, ActiveRecord returns the following message
Couldn't find Event with id=222
I tried to translate it this way

rescue_from ActiveRecord::RecordNotFound do |exception|
    render json: {
      error: error: I18n.t('activerecord.exceptions.not_found', :class_name => self.class.name.demodulize, :id => params[:id])
    }, status: 404
end

The problem is that self.class returns the EventsController controller, not the model name. And I need the message to be identical. And I'm not sure that it is impossible to do something easier and more correctly.
(the translation will be in German, by the way, you can suggest the correct translation :)