Adding an Object to Cloud Firestore using Flutter

Question

I want to add an object to Google Cloud Firestore in my Flutter app like this:

I ha

Answer 1

@Laksh22 As far as I understand, you mean something like this:

Firestore.instance.runTransaction((transaction) async {
    await transaction.set(Firestore.instance.collection("your_collection").document(), {
        'reply' : {
        'replyName': replyName,
        'replyText': replyText,
        'replyVotes': replyVotes,
    }
});

just like the screenshot above.

Answer 2

first, i highly recommend you have a single file that defines all of your schemas and/or models so there's a single point of reference for your db structure. like some file named dbSchema.dart:

import 'package:meta/meta.dart';

class Replies {

  final String title;  
  final Map coordinates;

  Replies({
    @required this.title,
    @required this.coordinates,
  });

 Map<String, dynamic> toJson() =>
  {
    'title': title,
    'coordinates': coordinates,
  };

}

and make the field that you want to be an object type Map. then, on the page you're going to insert into the db, import dbSchema.dart and create a new model:

Replies _replyObj = new Replies(
  title: _topic,
  coordinates: _coordinates,
);

this assumes you've defined your local _coordinates (or whatever) object prior to this, with something like :

_coordinates = {
 'lat': '40.0000',
 'lng': '110.000', 
};

and to then insert into Firestore, add the object's toJson method (you cannot insert/update a plain Dart model):

CollectionReference dbReplies = Firestore.instance.collection('replies');

Firestore.instance.runTransaction((Transaction tx) async {
  var _result = await dbReplies.add(_replyObj.toJson());
  ....

Update (5/31)

To convert the document read back into an object you need to add a fromJson to the class, like so:

Replies.fromJson(Map parsedJson) {
    id = parsedJson['id']; // the doc ID, helpful to have
    title = parsedJson['title'] ?? '';
    coordinates = parsedJson['coordinates'] ?? {};
}

so when you query the db:

QuerySnapshot _repliesQuery = await someCollection
        .where('title', isEqualTo: _title)
        .getDocuments();

List<DocumentSnapshot> _replyDocs = _repliesQuery.documents;

you can create an object out of each snapshot:

for (int _i = 0; _i < _replyDocs.length; _i++) {

  Replies _reply = Replies.fromJson(_replyDocs[_i].data);
  _reply.id = _replyDocs[_i].documentID;

  // do something with the new _reply object
}

Answer 3

You can run a Firestore transaction like this:

    Firestore.instance.runTransaction((transaction) async {
          await transaction.set(Firestore.instance.collection("your_collection").document(), {
            'replyName': replyName,
            'replyText': replyText,
            'replyVotes': replyVotes,
          });
        });