Cloud firestore rules using exist() does it count as a read?

问题

I am storing a collection of documents of blocked users. I am checking if the request is from a blocked user or not by checking if the email exist within the blocked collection

allow read: if exists(/databases/$(database)/documents/blocked/$(request.auth.token.email)) == false;

does checking if the document exist count as a read?

回答1:

Yes, exists() counts as a read toward your billing. They also count against the max number of reads you can perform per request.

来源：https://stackoverflow.com/questions/55257311/cloud-firestore-rules-using-exist-does-it-count-as-a-read