Firestore data not getting stored in Flutter - flutter

Question

I'm trying to store the user data in firestore, when I'm using the phone number as the document id it's getting stored perfectly but as soon as I changed it to uid it's not. And there were no exceptions been thrown at either. Also I checked if the uid is empty or not too and It's not empty either.
Future addUserToFirestore(String uid) async {
final docUser = FirebaseFirestore.instance
.collection('users')
.doc(uid);
final user = u.User(
name: widget.fullName,
email: widget.email,
gender: widget.gender,
nic: widget.nic,
phoneNumber: widget.phone,
bloodType: widget.bloodType,
dateOfBirth: widget.dateOfBirth,
address: widget.address,
age: int.parse(widget.age));
final json = user.toJson();
await docUser.set(json);
}
When I use .doc('+94${widget.phone}'); instead of .doc(uid); it works fine. But I want to use the uid as document id. Is there a way to get this done?

Answer 1

Try the following method.
Hopefully, this will help.
Future<void> storeUser () async {
var instance = FirebaseFirestore.instance;
await instance.collection("users").doc("uid").set({
// add all of the user data here.
});
}
Else also try:
Future addUserToFirestore(String uid) async {
// add await here as well
final docUser = await FirebaseFirestore.instance
.collection('users')
.doc(uid);
final user = u.User(
name: widget.fullName,
email: widget.email,
gender: widget.gender,
nic: widget.nic,
phoneNumber: widget.phone,
bloodType: widget.bloodType,
dateOfBirth: widget.dateOfBirth,
address: widget.address,
age: int.parse(widget.age));
final json = user.toJson();
await docUser.set(json);
}