Firestore: add or remove elements to existing array with Flutter [duplicate]

Question

Is it possible to add or delete elements to an existing array stored in a Firestore document instead of fetching the array, add the element locally and send it back to the store?

Tristan Bilot · Accepted Answer · 2020-11-20 17:29:48Z

11

Hopefully, yes.

You can append or remove an element using the method update() in combination with FieldValue.arrayUnion([element]) or FieldValue.arrayRemove([element]).

Example:

Future<void> appendToArray(String id, dynamic element) async {
  _firestore.collection(RootKey).doc(id).update({
    'myArrayField': FieldValue.arrayUnion([element]),
  });
}

Future<void> removeFromArray(String id, dynamic element) async {
  _firestore.collection(RootKey).doc(id).update({
    'myArrayField': FieldValue.arrayRemove([element]),
  });
}

answered Nov 20, 2020 at 17:29

Tristan Bilot

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1 Comment

Yılmaz edis Over a year ago

Thnak you, Your answer is so useful.

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