Firestore & Java: Remove a single element of Array [duplicate]

Question

I'm trying to delete a single element of an Firestore array. The database has the following structure:

Unfortunately, with the following code nothing happens.

public static void deleteTable(final int pos){
    FirebaseFirestore db = FirebaseFirestore.getInstance();
    FirebaseAuth fAuth = FirebaseAuth.getInstance();

    DocumentReference docRef = db.collection("users").document(fAuth.getUid().toString());
    docRef.update("myTables", FieldValue.arrayRemove(pos));
}

It would be nice if someone could help me out with this one. I just want to delete one element out of the myTables array. (The elements are HashMaps)

Cheers Andi

Doug Stevenson · Accepted Answer · 2020-10-24 19:17:54Z

1

Firestore does not support modification of array fields by index. FieldValue.arrayRemove() must always be delivered the full contents of the item to remove. In your case, that would be a Map containing all of the nested fields in the item to remove.

If you want to remove a field by index, you have to read the document, modify the array in memory, then write the modified array back to the document.

answered Oct 24, 2020 at 19:17

Doug Stevenson

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