Iterable<Parking> _parkingListFromSnapshot(QuerySnapshot snapshot){
    return snapshot.docs.map((doc){
      return Parking(
        car: doc.data['car'] ?? '', //problem
        name: doc.data['name'] ?? '', //problem
        num: doc.data['phone'] ?? '', //problem
      );

    }).toList();
  }

so the problem that I currently have is at the return Parking where it says that The operator '[]' isn't defined for the type 'Object? Function()'. also I already did the doc.data['car'] ?? '', as well still having the same problem

CodePudding user response：

Try changing Iterable<Parking> to List<Parking>.

CodePudding user response：

The data property of a DocumentSnapshot is a function, so you need to use () to invoke it:

car: doc.data()['car'] ?? ''

Alternatively you can use the get function to get the field values.

I also recommend reading the upgrade guide for FlutterFire, as there have been significant changes.