title: Flutter - print querysnapshot on firebase document does not work
body: <p>In the function below, I want to get all the records in a collection named 'contexts'.</p>
  <p>But, when I ask to print each record, I get nothing, not even an empty field or a null.</p>
  <p>On the console, it is like if I have never ask for print.</p>
  <p>I do not understand why.</p>
  <pre><code>Future getAllContextInFirebaseV1() async {
  
    CollectionReference ref = FirebaseFirestore.instance.collection('Users')
    .doc((FirebaseAuth.instance.currentUser.uid))
    .collection('contexts');
  
    QuerySnapshot contextsQuery = await ref
        .get();
  
    contextsQuery.docs.forEach((document) {
  
    print(document['context_Name']);
  
    });
    
  }
  </code></pre>
  <p><a href="https://i.stack.imgur.com/zYh7c.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zYh7c.png" alt="enter image description here" /></a></p>
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