Flutter DocumentSnapshot - 错误：“对象”类型的值？不能分配给“DocumentSnapshot”类型的变量

Question

return StreamBuilder(
  stream: usersRef.doc(post.userId).snapshots(),
  builder: (context, snapshot) {
    if (snapshot.hasData) {
      DocumentSnapshot snap = snapshot.data;
      UserModel user = UserModel.fromJson(snap.data()!);

大家好！ 'snapshot.data' 给了我上述错误。请帮忙！谢谢！

Answer 1

做DocumentSnapshot snap = snapshot.data as DocumentSnapshot ;