Error: The getter 'docs' isn't defined for the class 'Object'. - 'Object' is from 'dart:core'

user_15298841 0
Viewed 1666

I'm having issues with getting messages fetched from Firebase Cloud Firestore. The error being displayed is: 'Error: The getter 'docs' isn't defined for the class 'Object' - 'Object' is from 'dart:core'.'

Below is my code:

class ChatScreen extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
        return Scaffold(
          body: StreamBuilder<Object>(
              stream: FirebaseFirestore.instance
                  .collection('chats/EKLJIb8ZfRoDTqxkkJaB/messages')
                  .snapshots(),
              builder: (context, chatSnapshot) {
                return ListView.builder(
                  itemCount: chatSnapshot.data.**docs**.length,
                  itemBuilder: (ctx, index) => Container(
                    padding: EdgeInsets.all(8),
                    child: Text('this work'),
                  ),
                );
              }),
          floatingActionButton: FloatingActionButton(
            child: Icon(Icons.add),
            onPressed: null,
          ),
      );
   }
}
google-cloud-firestore firebase flutter
2 Answers

Change this:

body: StreamBuilder<Object>(

into this:

body: StreamBuilder<QuerySnapshot>(

The docs is a property under the class QuerySnapshot and not class Object.

You have to specify the type that your stream returns. So if you have a stream of type Stream<QuerySnapshot>, then you add that type as an argument to the StreamBuilder as you have seen in the code above.

In the new cloud_firestore package, the snapshots() method returns Stream<QuerySnapshot<Map<String, dynamic>>> therefore you would do:

body: StreamBuilder<QuerySnapshot<Map<String, dynamic>>>(

Adding dynamic might solve this issue, but it's preferable to add the type that is being returned because that way the editor or IDE will provide you with the code completion.

user_70154000

I have solved it by adding the datatype as dynamic after StreamBuilder, in my case the answer "Peter Haddad" didn't work for me, I had the exact same error.

This is how I solved it:

StreamBuilder<dynamic>(....Your Code here....)
user_96175270
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