argument type 'List<dynamic>' can't be assigned to the parameter type 'List<Widget>'

Question

I'm trying to retrieve data using json map and firestore but getting "The argument type 'List' can't be assigned to the parameter type 'List'" error on this line

posts.map(buildPost).toList(),

body

StreamBuilder<List<Post>>(
        stream: readPost(),
        builder: (context, snapshot) {
          if (snapshot.hasError) {
            return const Text('somthing went wrong');
          } else if (snapshot.hasData) {
            final posts = snapshot.data;
            return ListView(
              children: posts.map(buildPost).toList(),
            );
          } else {
            return const Center(
              child: CircularProgressIndicator(),
            );
          }
        },
      ),

readPost Method

  Stream<List<Post>> readPost() => FirebaseFirestore.instance
      .collection('Posts')
      .snapshots()
      .map((snapshot) =>
          snapshot.docs.map((doc) => Post.fromJson(doc.data())).toList());

buildPost method

buildPost(Post post) => ListTile(
        leading: const Icon(Icons.account_circle_outlined),
        title: Text(post.title),
        subtitle: Text(post.subject),
      );

Answer 1

You need to change your function

buildPost(Post post) => ListTile()

to

Widget buildPost(Post post) => ListTile()