Adding Data into A map field (Flutter Firestore)

Question

I am using cloud_firestore for flutter .I want to add onto a map field (userInfo) of a specific document of my firebase database on the press of a button. I do not want to add any other fields, only append more data to the map(userInfo).In this case using this code name is always unique (the userID) of a user.

 Firestore.instance.collection("prayerRooms") .document(docID) .updateData({ 'userInfo.userId': name, 'userInfo.userCount': 2 } );

Peter Haddad · Accepted Answer · 2020-04-25 20:37:41Z

2

This code:

 Firestore.instance.collection("prayerRooms") .document(docID) .updateData({ 'userInfo.userId': name, 'userInfo.userCount': 2 });

will update both the userId and the userCount inside the userInfo map. If you want to add more attribute inside the userInfo map, then you can do:

 Firestore.instance.collection("prayerRooms") .document(docID) .updateData({ 'userInfo.users': "user1", });

This will add a new attribute inside the map called users.

answered Apr 25, 2020 at 20:37

Peter Haddad

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5 Comments

Zain Thaver Over a year ago

Oh,no don't want to add another attribute, I want to add more data into the userId and userCount of the map. So every time I press the button with a different user, it should add that user's data into the userCount and userId field.It should keep the previous data , not overwrite it or update it.

Peter Haddad Over a year ago

every time you press the button with a different user, you should create a different document and not add it to the map, the max document size is 1mb, if every time a different user presses the button and you add to the map then the application wont scale

Peter Haddad Over a year ago

Check this firebase.google.com/docs/firestore/quotas#limits

Zain Thaver Over a year ago

Yes, I have read it. My app (at least starting off) will be limited to only a few users(30 or less).

Peter Haddad Over a year ago

Yes still u need to do it correctly from the beginning, each user should have thier own document

Hrvoje Čukman · Accepted Answer · 2021-05-16 18:52:12Z

You can user SetOptions(merge: true) for that

Full code:

Firestore.instance.collection("prayerRooms") .document(docID) .set({ 'userInfo.userId': name, 'userInfo.userCount': 2 }, SetOptions(merge: true), );

iAugustozSatoshi · Accepted Answer · 2023-02-15 19:17:00Z

2023:

 FirebaseFirestore db = FirebaseFirestore.instance; db.collection("collection") .doc("DOC-ID") .update({ 'userInfo.users': "user1" });

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