public function get_completion_date( $object_id, $format = 'F d, Y' ) {

		global $wpdb;

		$q = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT updated_date FROM {$wpdb->prefix}lifterlms_user_postmeta WHERE meta_key = '_is_complete' AND meta_value = 'yes' AND user_id = %d AND post_id = %d ORDER BY updated_date DESC LIMIT 1",
				array( $this->get_id(), $object_id )
			)
		); // db call ok; no-cache ok.

		return ( $q ) ? date_i18n( $format, strtotime( $q ) ) : false;

	}

	/**
	 * Retrieve IDs of user's enrollments by post type (and additional criteria)
	 *
	 * @param  string $post_type  name of the post type (course|membership)
	 * @param  array  $args query arguments
	 *                      @arg int    $limit    number of courses to return
	 *                      @arg string $orderby  table reference and field to order results by
	 *                      @arg string $order    result order (DESC, ASC)
	 *                      @arg int    $skip     number of results to skip for pagination purposes
	 *                      @arg string $status   filter results by enrollment status, "any", "enrolled", "cancelled", or "expired"
	 * @return array        "results" will contain an array of course ids
	 *                      "more" will contain a boolean determining whether or not more courses are available beyond supplied limit/skip criteria
	 *                      "found" will contain the total possible FOUND_ROWS() for the query
	 * @since    3.0.0
	 * @version  3.15.1
	 */
	public function get_enrollments( $post_type = 'course', $args = array() ) {

		global $wpdb;

		$args = wp_parse_args(
			$args,
			array(
				'limit'   => 20,
				'orderby' => 'upm.updated_date',
				'order'   => 'DESC',
				'skip'    => 0,
				'status'  => 'any', // Any, enrolled, cancelled, expired.
			)
		);

		// Prefix membership.
		if ( 'membership' === $post_type ) {
			$post_type = 'llms_membership';
		}

		// Sanitize order & orderby.
		$args['orderby'] = preg_replace( '/[^a-zA-Z_.]/', '', $args['orderby'] );
		$args['order']   = preg_replace( '/[^a-zA-Z_.]/', '', $args['order'] );

		// Allow "short" orderby's to be passed in without a table reference.
		switch ( $args['orderby'] ) {
			case 'date':
				$args['orderby'] = 'upm.updated_date';
				break;
			case 'order':
				$args['orderby'] = 'p.menu_order';
				break;
			case 'title':
				$args['orderby'] = 'p.post_title';
				break;
		}

		// Prepare additional status AND clauses.
		if ( 'any' !== $args['status'] ) {
			$status = $wpdb->prepare(
				"
				AND upm.meta_value = %s
				AND upm.updated_date = (
					SELECT MAX( upm2.updated_date )
					  FROM {$wpdb->prefix}lifterlms_user_postmeta AS upm2
					 WHERE upm2.meta_key = '_status'
					   AND upm2.user_id = %d
					   AND upm2.post_id = upm.post_id
					)",
				$args['status'],
				$this->get_id()
			);
		} else {
			$status = '';
		}

		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$query = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT SQL_CALC_FOUND_ROWS DISTINCT upm.post_id AS id
			 FROM {$wpdb->prefix}lifterlms_user_postmeta AS upm