发生异常。 StateError（错误 state：DocumentSnapshotPlatform 中不存在字段）- 当我发出请求时 Flutter Firestore

Question

我需要从 Firestore 中的数组获取数据。

我收到一个错误：

StateError (Bad state: field does not exist within the DocumentSnapshotPlatform)

当我在 firestore 数据库上运行以下查询时：

Future getData() async {
    await FirebaseFirestore.instance
        .collection("users")
        .get()
        .then((QuerySnapshot? querySnapshot) {
      querySnapshot!.docs.forEach((doc) {
        alldata = doc["errors"];
      });
    });
  }

我如何正确地进行此查询？

Answer 1

试试这个：

Future getData() async {
    final snapshot = await FirebaseFirestore.instance
        .collection("users")
        .get();

       querySnapshot!.docs.forEach((doc) {
        alldata = (doc.data() as Map<String, dynamic>)["errors"];
      });
  }

Answer 2

解决了！

Future getData() async {
    final docRef =
        await FirebaseFirestore.instance.collection("users").doc(user.uid);
    docRef.get().then(
      (DocumentSnapshot doc) {
        alldata = (doc.data() as Map<String, dynamic>)["errors"];
        print('Получен массив данных: ${alldata}');
        print('Получен массив данных: ${alldata.first}');
      },
      onError: (e) => print("Error getting document: $e"),
    );
  }