public function get( $key, $skip_cache = false ) {

		// Id will always be accessed from the object.
		if ( 'id' === $key ) {
			return $this->id;
		}

		// Return cached values if they exist.
		if ( ! is_null( $this->$key ) && ! $skip_cache ) {
			return $this->$key;
		}

		// get the value from the database.
		global $wpdb;
		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		return $wpdb->get_var( $wpdb->prepare( "SELECT {$key} FROM {$this->get_table()} WHERE id = %d", $this->id ) );  // db call ok; no-cache ok.

	}