Flutter Firesbase 正在返回 Null

Question

final db = FirebaseFirestore.instance.collection('dutyStatus');

Future<void> readOnDutyStatus() async {
//The function is being called in the authentication bloc
try {
  List status = [];
  // await db.add({'onDuty': true});
  var data = await db.doc('driver1').get();
  var temp = data.data();
  status.add(temp);
  print(
      '_______________________________________________________________________________________');
  print(status.toString());
  print(
      '_______________________________________________________________________________________');
} catch (e) {
  print(e);
}

}

The result : I/flutter (25466): _______________________________________________________________________________________

I/flutter (25466): [null]

I/flutter (25466): _______________________________________________________________________________________

W/er_drive_mobil(25466): Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed) W/er_drive_mobil(25466): Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, linking, allowed)

Note: The same code when used on another account of firebase works as intended and I can't seem to figure out the issue.

Answer 1

Most likely driver1 doesn't exist.

Try this

var temp =  data.exists ? data.data() : "Doc does not exist";
  

Print list should return [Doc does not exist] instead of null.

Check if there is a white space before driver1 ie _driver1 or after it. Otherwise there's no other explanation.