The argument type 'User?' can't be assigned to the parameter type 'Future?'

Question

With reference to the recent changes regarding FirebaseUser to User. FirebaseAuth.instance.currentUser() is not found at all (while throughing error "The expression doesn't evaluate to a function, so it can't be invoked."
The solution to that however was to simply remove the paranthesis as FirebaseAuth.instance.currentUser. But now we have another error that it isn't a future type i.e "The argument type User can't be assigned to the parameter type Future<Object?>?".

Following is my code block.

return FutureBuilder(
            future: FirebaseAuth.instance.currentUser,
            builder: (ctx, futureSnapshot) => ListView.builder(
              reverse: true, //  So that 1st message goes to last.
              itemCount: chatDocument.length,
              itemBuilder: (ctx, index) => MessageBubble(
                message: chatDocument[index]['text'],
                isMe: chatDocument[index]['userId'],
              ),
            ),
          );

In the above code block I intend to provide future to my `FutureBuilder`. In summary previously `FirebaseUser` object did return a future, but probably `User` doesn't anymore. How may I handle this case?
Thanks in advance.

you have to remove FutureBuilder , and use FirebaseAuth.instance.currentUser syimply because it is not a Future — Fatima ayaa, Jun 10 '21 at 16:14

jbryanh · Answer 1 · 2021-06-12T13:22:58.590

I don't typically do that with a FutureBuilder. Once you have a user, you don't need to async it.

final FirebaseAuth_auth = FirebaseAuth.instance();    
final User? user;
user = _auth.currentUser;

Then, if user != null ....create your ListView else, return a CircularProgressIndicator or whatever.

Look up Net Ninja for some nice videos for getting yourself set up with all that, just having a stream based on userChanges() for your project. More robust setup.

The argument type 'User?' can't be assigned to the parameter type 'Future?'

1 Answers1