public function __construct() {
		parent::__construct();

		$this->create_args['post_type'] = current( $this->ticket_types() );

		$this->default_args = [
			'post_type' => $this->ticket_types(),
			'orderby'   => [ 'date', 'ID' ],
		];

		$this->schema = array_merge( $this->schema, [
			'event'             => [ $this, 'filter_by_event' ],
			'event_not_in'      => [ $this, 'filter_by_event_not_in' ],
			'is_available'      => [ $this, 'filter_by_availability' ],
			'provider'          => [ $this, 'filter_by_provider' ],
			'attendees_min'     => [ $this, 'filter_by_attendees_min' ],
			'attendees_max'     => [ $this, 'filter_by_attendees_max' ],
			'attendees_between' => [ $this, 'filter_by_attendees_between' ],
			'checkedin_min'     => [ $this, 'filter_by_checkedin_min' ],
			'checkedin_max'     => [ $this, 'filter_by_checkedin_max' ],
			'checkedin_between' => [ $this, 'filter_by_checkedin_between' ],
			'capacity_min'      => [ $this, 'filter_by_capacity_min' ],
			'capacity_max'      => [ $this, 'filter_by_capacity_max' ],
			'capacity_between'  => [ $this, 'filter_by_capacity_between' ],
			'available_from'    => [ $this, 'filter_by_available_from' ],
			'available_until'   => [ $this, 'filter_by_available_until' ],
			'event_status'      => [ $this, 'filter_by_event_status' ],
			'has_attendee_meta' => [ $this, 'filter_by_attendee_meta_existence' ],
			'currency_code'     => [ $this, 'filter_by_currency_code' ],
		] );
	}