文档路径必须是一个非空字符串，颤音 - firebase错误？

Question

我在颤音和燃烧案中遇到了一些错误，如果有人可以提供帮助，这是我的auth Controller，

class AuthController extends GetxController {
  final FirebaseAuth auth = FirebaseAuth.instance;
  final Rxn<User> _firebaseUser = Rxn<User>();
  Rx<XFile>? _pickedImage;

  XFile? get profilePhoto => _pickedImage?.value;
  // final user = FirebaseAuth.instance.currentUser.obs;

  Rxn<User> get user => _firebaseUser;
  // final user = FirebaseAuth.instance.currentUser;

  @override
  onInit() {
    _firebaseUser.bindStream(auth.authStateChanges());
    super.onInit();
  }

  // void register(
  //     String name, String email, String password, XFile? image) async {
  //   try {
  //     UserCredential _authResult = await auth.createUserWithEmailAndPassword(
  //         email: email.trim(), password: password);

  //     //create user in database.dart

  //     String downloadUrl = await uploadToStorage(image!);

  //     UserModel _user = UserModel(
  //       id: _authResult.user?.uid,
  //       name: name,
  //       email: _authResult.user?.email,
  //       profilePic: downloadUrl,
  //     );

  //     if (await Database().createNewUser(_user)) {
  //       Get.find<UserController>().user = _user;
  //     }
  //   } catch (e) {
  //     Get.snackbar(
  //       "Error creating Account",
  //       e.toString(),
  //       snackPosition: SnackPosition.BOTTOM,
  //     );
  //   }
  // }
  void register(
      String name, String email, String password, XFile? image) async {
    try {
      if (name.isNotEmpty &&
          email.isNotEmpty &&
          password.isNotEmpty &&
          image != null) {
        // save out user to our ath and firebase firestore
        UserCredential _authResult = await auth.createUserWithEmailAndPassword(
          email: email,
          password: password,
        );
        String downloadUrl = await uploadToStorage(image);
        UserModel _user = UserModel(
          id: _authResult.user?.uid,
          name: name,
          email: _authResult.user?.email,
          profilePic: downloadUrl,
        );
        if (await Database().createNewUser(_user)) {
          Get.find<UserController>().user = _user;
        } else {
          Get.snackbar(
            'Error Creating Account',
            'Please enter all the fields',
          );
        }
      }
    } catch (e) {
      Get.snackbar(
        'Error Creating Account',
        e.toString(),
      );
    }
  }

  void login(String email, password) async {
    try {
      UserCredential _authResult = await auth.signInWithEmailAndPassword(
          email: email.trim(), password: password);
      Get.find<UserController>().user =
          await Database().getUser(_authResult.user?.uid ?? '');
    } catch (e) {
      Get.snackbar("About User", "User message",
          snackPosition: SnackPosition.BOTTOM,
          titleText: Text("Acount creation failed"),
          messageText:
              Text(e.toString(), style: TextStyle(color: Colors.white)));
    }
  }

  Future<void> signOut() async {
    await auth.signOut();
    Get.find<UserController>().clear();
  }

  Future pickImage() async {
    print("call on click add photo icon");
    final ImagePicker _picker = ImagePicker();
    final XFile? pickedImage =
        await _picker.pickImage(source: ImageSource.gallery);
    print('picked image filled with image from gallery'); //This doesnt print at

    if (pickedImage != null) {
      Get.snackbar('Profile Picture',
          'You have successfully selected your profile picture!');

      // print(pickedImage.path);
    }
    _pickedImage = Rx<XFile>(pickedImage!);
    // print(_pickedImage);
    // print(profilePhoto);
  }

  // upload to firebase storage
  Future<String> uploadToStorage(XFile? image) async {
    Reference ref = FirebaseStorage.instance
        .ref('')
        .child('profilePics')
        .child(auth.currentUser!.uid);

    // print(ref);

    UploadTask uploadTask = ref.putFile(File(image?.path ?? 'idemo'));
    print(uploadTask);
    // TaskSnapshot snap = await uploadTask;
    String downloadUrl = await (await uploadTask).ref.getDownloadURL();
    print(downloadUrl);
    return downloadUrl;
  }
}

这是我在这里创建的功能

class Database {
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;

  Future<bool> createNewUser(UserModel user) async {
    try {
      await _firestore.collection("users").doc(user.id).set({
        "name": user.name,
        "email": user.email,
        "profilePhoto": user.profilePic
      });
      return true;
    } catch (e) {
      print(e);
      return false;
    }
  }

，这里是HomeController

class HomeController extends GetxController {
  final Rxn<List<TodoModel>> todoList = Rxn<List<TodoModel>>([]);

  var selectedDate = DateTime.now().obs;

  List<TodoModel>? get todos => todoList.value;

  @override
  void onInit() {
    super.onInit();
    String? uid = Get.find<AuthController>().auth.currentUser?.uid ?? '';
    print(uid);
    todoList.bindStream(Database().todoStream(uid));
  }

  chooseDate() async {
    DateTime? pickedDate = await showDatePicker(
      context: Get.context!,
      initialDate: selectedDate.value,
      firstDate: DateTime(2000),
      lastDate: DateTime(2024),
      //initialEntryMode: DatePickerEntryMode.input,
      // initialDatePickerMode: DatePickerMode.year,
    );
    if (pickedDate != null && pickedDate != selectedDate.value) {
      selectedDate.value = pickedDate;
    }
  }
}

，这里是查看页面，

GetX<HomeController>(
  init: Get.put<HomeController>(HomeController()),
  builder: (HomeController todoController) {
    if (todoController.todos != null) {
      // print(todoController.todos?.done ?? false);
      return Expanded(
        child: ListView.builder(
          itemCount: todoController.todos?.length,
          itemBuilder: (_, index) {
            return TodoCard(
              uid: controller.user.value?.uid ?? '',
              todo: todoController.todos![index],
            );
          },
        ),
      );
    } else {
      return Text("loading...");
    }
  },
),

所以我有一个错误，当我注册新用户时，我得到了这个错误。错误：

以下断言是抛出建筑物建造者（肮脏）： 文档路径必须是非空字符串 失败断言：第116行POS 14：'path.isnotempty'

此处是从终端输出的：

The relevant error-causing widget was
GetMaterialApp
lib/main.dart:23
When the exception was thrown, this was the stack
#2      _JsonCollectionReference.doc
#3      Database.todoStream
#4      HomeController.onInit
#5      GetLifeCycleBase._onStart
#6      InternalFinalCallback.call
#7      GetInstance._startController
#8      GetInstance._initDependencies
#9      GetInstance.find
#10     GetInstance.put
#11     Inst.put

因此，此路径的问题是一个问题，当我从视觉工作室重新加载时，我会使用正确的数据来适合正确的用户。因此，问题是当我第一次注册用户时。

Answer 1

看起来uid是空的，您还应该能够从输出中查找print（uid）;中看到。

当您的应用程序或网页加载时，Firebase会自动尝试从其本地状态恢复以前签名的用户。但是，这要求它拨打服务器的呼叫（例如，检查帐户是否已被禁用），并且在呼叫进行时，您的主代码继续执行，并且currentuser变量正在进行为null。

您的代码需要考虑到这一点。最简单的方法是不依赖currentuser，而是用反应性地响应身份验证状态的变化，如获得当前的用户：

FirebaseAuth.instance
  .authStateChanges()
  .listen((User? user) {
    if (user != null) {
      print(user.uid);
    }
  });

auth> authstateChange每当身份验证状态变化时，这会发射事件，因此当用户登录或登录时。使用此流的常见方法是将用户设置为小部件的状态，或者直接在streamBuilder中使用该流。