Firestore + Swift Query - Check for value within an array in specified document

Question

Is there a way to check for value within an array if you're querying for a specific document ID?

This doesn't work:

let userID = Auth.auth().currentUser?.uid ?? "nil"
let db = Firestore.firestore()
db.collection("users").document(userID).whereField("favorites", arrayContains: productID)

Seems like you can only use .whereField directly after declaring the collection, but not on the document.

danh · Accepted Answer · 2020-01-08 00:08:28Z

1

The idea of the where methods is to find docs in a collection satisfying some criterion.

If you've already got a doc ref, just get() it and check the array in the client.

Alternatively, query the collection with where, and see if your user id is one of the ids in the resulting snapshot.

answered Jan 8, 2020 at 0:08

danh

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