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

Just adding to Doug Stevenson's answer, I had to use the key isGreaterThan: '' in order to not get an empty array.

Firestore.instance
    .collection('posts')
    .where('userlist.' + userId, isGreaterThan: '')
    .snapshots(),