How to cache "exists" validation in Yii2

I'm trying to cache the db calls for Yii2 exists validation, but can't work out where to initiate it.

Because I'm using a multi-model form with a lot of relations, the overhead is getting a little too much.

Any ideas?

This is not supported by Yii, you either have to :

• Extend the ExistValidator and implement your caching logic there
• Add a custom ActiveQuery class to your model in question and override the exists() and count() methods