不匹配 arguments 的闭包调用：function '[]' (Flutter/Dart)

Question

Im quite new to flutter and I'm having an issue trying to create an application that has two users, namely Patients and Physiotherapists. Depending on the type of user, it will navigate to the PatientHome() or PhysioHome().

I have tried creating a new field userType for every user in firestore, but I'm having trouble pulling the userType data and creating a logic that helps me navigate to either screens: Particularly, this widget Wrapper() is supposed to help me check if the userType is Patient or Physiotherapist and navigate accordingly.

However, it's returning me a "flutter: NoSuchMethodError: Closure call with mismatched arguments: function '[]' Receiver: Closure: () => Map<String, dynamic>? from Function 'data':. Tried calling: " error.

My wrapper class is as follows:

class Wrapper extends StatelessWidget {

  Future<String?> getUserType(String uid) async {

    try {
      DocumentSnapshot _docSnapShot = await FirebaseFirestore.instance.collection('users').doc(uid).get();
      var userType = (_docSnapShot.data as dynamic)['userType'];
      return userType;
    } catch (e) {
      print(e);
    }
  }

  @override
  Widget build(BuildContext context) {
    final inputuser = Provider.of<CustomUser?>(context);

    //return either Home or Authenticate widget
    if ( inputuser == null) {
      return Authenticate();
    } else if (getUserType(inputuser.uid) == "Patient") {
      return PatientHome();
    } else {
      return PhysioHome();
    }
  }

Thank you in advance for your help!

Answer 1

Im quite new to flutter and I'm having an issue trying to create an application that has two users, namely Patients and Physiotherapists. Depending on the type of user, it will navigate to the PatientHome() or PhysioHome().

I have tried creating a new field userType for every user in firestore, but I'm having trouble pulling the userType data and creating a logic that helps me navigate to either screens: Particularly, this widget Wrapper() is supposed to help me check if the userType is Patient or Physiotherapist and navigate accordingly.

However, it's returning me a "flutter: NoSuchMethodError: Closure call with mismatched arguments: function '[]' Receiver: Closure: () => Map<String, dynamic>? from Function 'data':. Tried calling: " error.

My wrapper class is as follows:

class Wrapper extends StatelessWidget {

  Future<String?> getUserType(String uid) async {

    try {
      DocumentSnapshot _docSnapShot = await FirebaseFirestore.instance.collection('users').doc(uid).get();
      var userType = (_docSnapShot.data as dynamic)['userType'];
      return userType;
    } catch (e) {
      print(e);
    }
  }

  @override
  Widget build(BuildContext context) {
    final inputuser = Provider.of<CustomUser?>(context);

    //return either Home or Authenticate widget
    if ( inputuser == null) {
      return Authenticate();
    } else if (getUserType(inputuser.uid) == "Patient") {
      return PatientHome();
    } else {
      return PhysioHome();
    }
  }

Thank you in advance for your help!