protected function dropForeign($name)
    {
        if (empty($name)) {
            return Yii::t('podium/flash', 'Installation aborted! Foreign key name missing.');
        }
        try {
            $this->db->createCommand()->dropForeignKey($this->getForeignName($name), $this->table)->execute();
            return $this->returnWarning(Yii::t('podium/flash', 'Table foreign key {name} has been dropped', [
                'name' => $this->getForeignName($name)
            ]));
        } catch (Exception $e) {
            return $this->returnError($e->getMessage(), __METHOD__,
                Yii::t('podium/flash', 'Error during table foreign key {name} dropping', [
                    'name' => $this->getForeignName($name)
                ])
            );
        }
    }