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name Punditsdkoslkdosdkoskdo

Firestore: Query by item in array of document

I have a document "user" which has a key called "photos". Here is an array of strings being saved, namely the IDs of the "photo" documents.

I want to query "user" by this "photos" field: I want all users who have this ID in the "photos" property.

Is this possible through firestore?

Added 'array-contains' query operator for use with .where() to find documents where an array field contains a specific element.

https://firebase.google.com/support/release-notes/js 5.3.0

Update: also available in @google-cloud/firestore: https://github.com/googleapis/nodejs-firestore/releases/tag/v0.16.0

Update 2 https://firebase.googleblog.com/2018/08/better-arrays-in-cloud-firestore.html

Update 3 now available in Admin Node.js SDK v6.0.0 https://github.com/firebase/firebase-admin-node/releases

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