How to manage add and update data in Firebase

问题

I'm using Flutter. I would like to add data at first. If email or uid had been registered, I want to update data01/02 or add data01/02.

How can I specify the initial data.

    _firestore.collection('members').add({
    'uid': loginUser.uid,
    'email': loginUser.email,
    'data01': {
        'name': name,
        'img_url': 'https://www.xxx.xxx/xxx.png',
        'data02': {
            'phone': phone,
        }
    }

Please give me advice.

回答1:

Assuming you set your document name to your loginUser.uid you can use:

String rawJson = '{
    "email": loginUser.email,
    "data01": {
        "name": name,
        "img_url": "https://www.xxx.xxx/xxx.png",
        "data02": {
            "phone": phone,
        }
    }';

Map<String, dynamic> updateData = jsonDecode(rawJson); // import 'dart:convert';


final userDocument = await Firestore.instance.document('members/$loginUser.uid');
final userDocumentGet = userDocument.get().then((value) {
      if (value == null || !value.exists) {
      //a document for the member can NOT be found
      Firestore.instance.document('members/$loginUser.uid').setData(updateData);

    } else {
      //a document for the member is found
     Firestore.instance.document('members/$loginUser.uid').updateData(updateData);

    }
});

来源：https://stackoverflow.com/questions/61910157/how-to-manage-add-and-update-data-in-firebase