    public static function getLinkTypes () {
        return Yii::app()->db->createCommand ("
            SELECT distinct(modelName)
            FROM x2_fields
            WHERE fieldName='nameId'
            ORDER by modelName ASC
        ")->queryColumn ();
    }
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.