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

It doesn't really make sense for userlist to be an array here. Firestore doesn't let you query for values of maps inside an array. Just store it as a map. If userlist was just a map of uid/value pairs, you could query it like this using dot notation:

Firestore.instance
        .collection('posts')
        .orderBy('createdAt', descending: true)
        .where('userlist.' + userId, isEqualTo: true)
        .snapshots(),