How add elements to an existing map firestore

Question

i am doing some work with flutter and firebase, so i can't figure out how add new elements to an existing document who has an existing map with some created fields so.. the map for example is this

'Users':{uid0:{'Name':{'userName0'},uid1:{'Name':{'userName1'}}

An this is my actual code.

Firestore.instance.collection('on_going_matches').where('userSlot',isGreaterThan: 0).snapshots().listen(
          (data) => {
              Firestore.instance.runTransaction((transaction) async {
                await transaction.update(Firestore.instance.collection("on_going_matches").document(data.documents[0].documentID), {
                  'users': {uid:{'Name':name}},
                  'userSlot': data.documents[0]['userSlot'] - 1
                }
                );
              })
              });

I have another question too, what i can do when "where" condition "where('userSlot',isGreaterThan: 0)" is not found, how i can use this like an if/else statement so, if Firestore query is not found, do a thing.

to update an existing document: myDocument.setData(myMap, merge: true); — Rubens Melo
– Rubens Melo, Commented Jul 8, 2019 at 6:11
Yeah, thanks, i was trying to do this with transactions... but i realized that i can't — Sebastián Mahuzier
– Sebastián Mahuzier, Commented Jul 11, 2019 at 19:32

Rubens Melo · Accepted Answer · 2019-07-12 20:04:57Z

4

To update an existing document: myDocument.setData(myMap, merge: true);

answered Jul 12, 2019 at 20:04

Rubens Melo

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