Weird Relation Query.

Hi,

I have this tables:

product (
  id,
  ...
);

product_translation (
  product_id,
  lang_code,
  name,
  ...
);

When I get the Product with its relation from product_translation I want it according to the user selected language, so on the relation I have:

  'productTranslation' => array(self::HAS_ONE, 'ProductTranslation', 'product_id',
    'condition'=>Yii::app()->db->quoteColumnName('productTranslation.lang_code')."='".Yii::app()->user->language."'"
  ),

The problem is that the translation in the user language might not exist, so get it in the default language.

How can I do this?