uid is not defined for type 'Object' in flutter-CodePudding

i am trying to check if a user id is the same as the current user's id by using data.uid but i keep getting this error:

The getter 'uid' isn't defined for the type 'Object'.

this is the code

Widget build(BuildContext context) {

    return FutureBuilder(
        future: Future.value(FirebaseAuth.instance.currentUser),
        builder: (context, futureSnapshot){
          if(futureSnapshot.connectionState == ConnectionState.waiting){
            return Center(child: CircularProgressIndicator(),);
      }
           return StreamBuilder <QuerySnapshot>(
      stream: firestore.collection('chats').orderBy('timeStamp', descending: true).snapshots(),
      builder:(ctx, chatSnapshot){
      if(chatSnapshot.connectionState == ConnectionState.waiting){
        return Center(child: CircularProgressIndicator(),);
      }
      final chatdocs = chatSnapshot.data!.docs;
      
      return ListView.builder(
        reverse: true,
        itemCount: chatdocs.length ,
        itemBuilder: (ctx, index) => messageBubble(
          chatdocs[index]['text'],
          chatdocs[index]['userId'] == futureSnapshot.data!.uid, //this is the error
          )
        );
        }
        );
    } );

CodePudding user response：

Change this :

chatdocs[index]['userId'] == futureSnapshot.data!.uid, //this is the error

to this :

chatdocs[index]['userId'] = futureSnapshot.data!.uid,

CodePudding user response：

You can try json decoding your variable into the object User you are looking for: If the futureSnapshot.data is a user you'll be able to use the uid as a map key to check with chatdocs[index]['userId']

Like this:

import 'dart:convert';

final Map<String, dynamic> _valueMap = json.decode(futureSnapshot.data!);

chatdocs[index]['userId'] == _valueMap['uid'];

CodePudding user response：

Since you don't declare the type of the Future in your FutureBuilder, it resolves to an Object. And an Object doesn't have a uid property, which is why you get the error.

To solve this declare the type of your FutureBuilder, which in your case would be:

return FutureBuilder<User>(

Note that I have no idea why you're using a FutureBuilder here to begin with. The FirebaseAuth.instance.currentUser is a synchronous value, so you don't need a FutureBuilder to access it. Removing the FutureBuilder would lead to the exact same result.

If you're trying to make your code respond to auth state changes, like that it takes a moment for Firebase to restore the user's sign-in state when you start the app, you'll want to actually listen to authStateChanges with a StreamBuilder for that nowadays, as shown in the first code snippet in the documentation on getting the current user. Here too, you'll want to declare your StreamBuilder with a User type, just like we did above for the FutureBuilder.

CodePudding user response：

Try the following code:

StreamBuilder<QuerySnapshot>(
  stream: firestore.collection('chats').orderBy('timeStamp', descending: true).snapshots(),
  builder: (ctx, chatSnapshot) {
    if (chatSnapshot.connectionState == ConnectionState.waiting) {
      return const Center(
        child: CircularProgressIndicator(),
      );
    }

    final List<QueryDocumentSnapshot<Object?>> chatdocs = chatSnapshot.data!.docs;
    final String uid = FirebaseAuth.instance.currentUser?.uid ?? '';

    return ListView.builder(
      reverse: true,
      itemCount: chatdocs.length,
      itemBuilder: (ctx, index) {
        final Map<String, dynamic> chat = (chatdocs[index]).data() as Map<String, dynamic>;

        return messageBubble(
          chat['text'],
          chat['userId'] == uid,
        );
      },
    );
  },
),