Flutter Firestore add new document with Custom ID

Question

How to add new document with custom id using Dart and Flutter?

PS: I can add new document to collection but its id sets randomly, using this code

Answer 1

String uniqueCode = //Your Unique Code
DocumentReference reference = Firestore.instance.document("test/" + uniqueCode );

//Setting Data
Map yourData;
reference.setData(yourData);