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

		// Set the order post type.
		$this->default_args['post_type']   = Attendee::POSTTYPE;
		$this->default_args['post_status'] = 'publish';
		$this->create_args['post_status']  = 'publish';
		$this->create_args['post_type']    = Attendee::POSTTYPE;

		$aliases = [
			'order_id'          => 'post_parent',
			'ticket_id'         => Attendee::$ticket_relation_meta_key,
			'event_id'          => Attendee::$event_relation_meta_key,
			'user_id'           => Attendee::$user_relation_meta_key,
			'security_code'     => Attendee::$security_code_meta_key,
			'opt_out'           => Attendee::$optout_meta_key,
			'checked_in'        => Attendee::$checked_in_meta_key,
			'price_paid'        => Attendee::$price_paid_meta_key,
			'currency'          => Attendee::$currency_meta_key,
			'full_name'         => Attendee::$full_name_meta_key,
			'email'             => Attendee::$email_meta_key,
			'is_deleted_ticket' => Attendee::$deleted_ticket_meta_key,
			'ticket_sent'       => Attendee::$ticket_sent_meta_key,
			'is_subscribed'     => Attendee::$subscribed_meta_key,
		];

		/**
		 * Allows for filtering the repository aliases.
		 *
		 * @since 5.2.0
		 *
		 * @param array $aliases Repository aliases.
		 */
		$aliases = apply_filters( 'tec_tickets_commerce_attendees_repository_aliases', $aliases );

		// Add event specific aliases.
		$this->update_fields_aliases = array_merge(
			$this->update_fields_aliases,
			$aliases
		);

		$this->schema = array_merge(
			$this->schema,
			[
				'tickets'     => [ $this, 'filter_by_tickets' ],
				'tickets_not' => [ $this, 'filter_by_tickets_not' ],
				'events'      => [ $this, 'filter_by_events' ],
				'events_not'  => [ $this, 'filter_by_events_not' ],
			]
		);

		$this->add_simple_meta_schema_entry( 'ticket_id', Attendee::$ticket_relation_meta_key, 'meta_equals' );
		$this->add_simple_meta_schema_entry( 'event_id', Attendee::$event_relation_meta_key, 'meta_equals' );
	}