Query a Map containing an ID saved in Cloud Firestore with Dart/Flutter

Question

How to get a Map stored in Cloud Firestore with Dart/Flutter ? I tried this but it only works with Array :

Firestore.instance
            .collection(\'posts\')
          


        

Answer 1

I don't recommend your way of data model. Because of some limitations as below:

1. You can only have 20000 fields in a firestore document (including array fields).
2. You can't assign security rules to each field. Security Rules is a thing that you have to think of.
3. You can't query them.

So, better I would recommend you to use documents for each user.