firebase - How to query Cloud Firestore for non-existing keys of documents

Question

Let's say I have a data model with some optional properties. This could be for example a user object with a "firstname", a "lastname" and an optional "website" property.

In Cloud Firestore only user documents with a known website would have the "website" property set, for all other user documents this property would not exist.

My questions is now how to query for all user documents without a "website" property.

Thanks.

question from:https://stackoverflow.com/questions/46806860/how-to-query-cloud-firestore-for-non-existing-keys-of-documents

Answer 1

Waitting for answers