How to set indexing of linked data in yii2?

Question

PHP

Welcome all. Can you please tell me what should be done to set up indexing of linked data in yii2?
Let me explain what I mean: the ActiveRecord model has a method:

...
public function getProperties()
{
    return $this->hasMany(Property::class, ['entity_id' => 'id']);
}
...

And it is necessary that the output array be indexed by the slug field from the Property model. For some reason, the indexBy method simply substitutes the field name in the selection result and, accordingly, only one record remains.