private function insert_incompletion_postmeta( $object_id, $trigger = 'unspecified' ) {

		global $wpdb;

		// Add '_is_complete' to the user postmeta table for object.
		$user_metadatas = array(
			'_is_complete'        => 'no',
			'_completion_trigger' => $trigger,
		);

		foreach ( $user_metadatas as $key => $value ) {

			/**
			 * It's too difficult to keep track of multiple postmetas for each lesson incomplete
			 * Instead, I'm just replacing the old '_is_complete' value with 'no'
			 *
			 * Lessons that have never been complete will not have an '_is_complete' record,
			 * Lessons that were completed will have an '_is_complete' record of 'yes',
			 * Lessons that have been completed once but were marked incomplete will have an '_is_complete' record of 'no'
			 */
			$update = $wpdb->update(
				$wpdb->prefix . 'lifterlms_user_postmeta',
				array(
					'user_id'      => $this->get_id(),
					'post_id'      => $object_id,
					'meta_key'     => $key,
					'meta_value'   => $value,
					'updated_date' => current_time( 'mysql' ),
				),
				array(
					'user_id'  => $this->get_id(),
					'post_id'  => $object_id,
					'meta_key' => $key,
				),
				array( '%d', '%d', '%s', '%s', '%s' )
			); // db call ok; no-cache ok.

			if ( false === $update ) {

				return false;

			}
		}

		return true;

	}