添加到特定文档的 map 字段 (Flutter Firestore)

Question

I am using flutter firestore and want to only add users(using the userInfo map) (and not add any other fields) to a specific document in my PrayerRooms Collection.I am unsure of how to do this and whether this is possible The database I want to add into

Answer 1

If you have other fields and you just want to add data to the userInfo map while keep the other fields, then you can use updateData() :

 Firestore.instance.collection("PrayersRoom").document(userId).updateData({
                     "userInfo.userId" : userId,
                     "userInfo.userCount" : 2
                   });