更新 Cloud Firestore 中的字段时两个地图之间的区别

Question

var data = {
  'key.number': 1,
};

var data = {
  'key' : {
    'number': 1,
  }
};

Is there any difference between the two Map s when updating number on the cloud firestore using

var ref = Firestore.instance.document('users/id');
ref.updateData(data);

Answer 1

If the document didn't already have a "key" field, there is no difference.

If the document did already have a "key" field, the first one would just overwrite any existing value for key.field , preserving any other fields in the key object, and the second one would completely overwrite the key object and all of its existing fields.