Yii CActiveRecord dynamic relation adding

gistfile1.php

$class = CActiveRecord::HAS_MANY; // Или любой другой вид отношений (HAS_ONE, BELONGS_TO, MANY_MANY) 
$model->getMetaData()->relations[$relationName] =
new $class(
    $relationName,
    $className,
    $foreignKey,
    $options   
);