Flutter how to add map to existing array on firebase

Question

I am using this code to upload data to firebase:

List<Map<String, dynamic>> mapData = [
    {
      'name': 'name1',
      'done': false,
      'frequency': '1',
    },
    {
      'name': 'name2',
      'done': false,
      'frequency': '5',
    },
  ];

if (isExist == false && listNameController.text.isNotEmpty) {
        await Firestore.instance
            .collection(widget.user.uid)
            .document(listNameController.text.toString().trim())
            .setData({
          'users': mapData,
        });

But now I want to add more data. I have tried this code but it overwrites all content. What can I do to just add the data to 'users'?

Firestore.instance
.collection(widget.user.uid)
.document(widget.currentList.keys.elementAt(widget.i))
.updateData({
'users': {
'name': 'name3',
'done': false,
'frequency': '7'
},

Did you try document.setData instead of document.updateData? — Texv
– Texv, Commented Nov 7, 2022 at 11:07

Rohit · Accepted Answer · 2022-11-08 06:41:09Z

1

You can use arrayUnion to add array elements. Please use latest version of firestore package from pub.dev

Firestore.instance
.collection(widget.user.uid)
.document(widget.currentList.keys.elementAt(widget.i)).update({
          "users": FieldValue.arrayUnion([new User]),
 });

edited Nov 8, 2022 at 6:41

answered Nov 7, 2022 at 11:22

Rohit

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