In my app, each user has a document in the users collection of my database. Under each user's document, there is a subcollection for that user's uploaded foods. By default, I want to limit it so that the user cannot add more than 25 foods to their personal subcollection. Is there a way to check via Security Rules if the collection size is <= 25?
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It's not possible in security rules.
If you want a document count, you will have to manage one of your own in a single document. Then you could write rules to check against the count that you manage in that document.
Doug Stevenson
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now it is possible with a regular client query. - [link](https://firebase.google.com/docs/firestore/query-data/aggregation-queries) – Rajendra A Verma Jul 26 '23 at 16:27
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now, can we apply in firestore security rule ? – Rajendra A Verma Jul 26 '23 at 16:29