The Firebase 'not-in' operator is malfunctioning

Within my database, there is a document located at: https://i.stack.imgur.com/OTZpd.png

I am attempting to query the number of messages documents where the user's ID does not appear in the "read_by" array. This is the code I am currently using:

const q = query(messagesRef, where('read_by', 'not-in', [user.uid]))
const docs = await getDocs(q)

Unfortunately, this particular condition is not functioning as expected. It continues to return 2 documents, even though both contain the user's ID within the array. I have verified that the "user.uid" is accurate and returns the correct user id.

javascriptfirebasegoogle-cloud-firestore

Answer №1

The not-in operator includes a document in its results when a single-value field does not match any of the values specified in an array. It specifically excludes handling array fields.

If you're seeking an equivalent to an array-does-not-contain operator, unfortunately Firestore does not currently offer support for this functionality.

For more information, explore these resources:

  • FireStore - how to get around array "does-not-contain" queries
  • Firestore get documents where value not in array?
  • Structuring a firestore database to filter by what is not in the array?
  • Angular Firestore | how to get array not contain

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