CODEWITHSUNDEEP
firebasefluttergoogle-cloud-firestore
Ulquiorra
Ulquiorra

Reputation: 45

How do I retrieve a document ID in Firestore after creating a user collection using Flutter

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';


Future<void> userSetup(String displayName) async{
  FirebaseAuth auth =  FirebaseAuth.instance;
  String uid = auth.currentUser.uid.toString();
  CollectionReference users = FirebaseFirestore.instance.collection("Users");

  users.add({
    'displayName': displayName,
    'uid': uid,
    // 'docID': docID,
  });
  return;
}

Just to preface, I'm a complete beginner with Flutter.

This is what I'm using to add the collection in Firestore but I'd like to retrieve the the specific document ID and use it for further storage. Is there a method to obtain and store the document ID in the user details? I'm trying to retrieve the specific user's name when they login and display it on the homepage.

Upvotes: 0

Views: 1076

Answers (5)

Santiago Racca
Santiago Racca

Reputation: 138

In the case that you do not want to use custom IDs for your documents but instead rely on firebase auto generated IDs you can do the following.

Future<void> userSetup(String displayName) async {
 FirebaseAuth auth =  FirebaseAuth.instance;
 String uid = auth.currentUser.uid.toString();
 CollectionReference users = FirebaseFirestore.instance.collection("Users");
 users.doc(uid).set({
    'displayName': displayName,
  });
  return;
}

This will set the document ID to be the same as the users uid. The benefit of this approach is two fold.

  1. You do not have to set an additional id property in the document.
  2. You can now query the users collection for the specific user using the currently signed in users uid

Upvotes: 0

Muhammad Hassan
Muhammad Hassan

Reputation: 1

At runtime, components are able to read the contents of their own package by accessing the path /pkg/ in their namespace. The resource() template may be used to add contents to the package that may be accessed this way.

Upvotes: -1

noobiekes
noobiekes

Reputation: 154

You may try this method

Preset the document id with your own, you may use the package uuid https://pub.dev/packages/uuid

or use the user's uid as the doc id

//final docID = Uuid().v4(); //use custom uuid for doc id
//final docID = uid; //use user id as doc id
users.doc(docID).set({
      'displayName': displayName,
      'uid': uid,
    });

Then save the docID to user device with shared_preferences for persistant storage https://pub.dev/packages/shared_preferences

Upvotes: 1

Arkam Fajeel
Arkam Fajeel

Reputation: 1

You can retrieve **firestore** doc id only when you retrieve the data using a stream builder. Take a look at the code.

Streambuilder(
stream: Firestore.instance.collection("Your collection").snapshot(),
builder: (context,snapshot) {
 if(snapshot.hasData) {
List<User> users = []
  for(var doc in sanpshot.data.documents) {
    users.add(
     new User(
     name: doc.data["name"],
     email: doc.data["email"]
     **id: doc.documentID** 
      )
        )

   return Column(
    children: users
    )

    }
  }
 }
)

Upvotes: 0

Frank van Puffelen
Frank van Puffelen

Reputation: 598901

If you want to store the ID inside the document, you can first create the DocumentReference for the new document by calling CollectionReference.doc() without parameters:

CollectionReference users = FirebaseFirestore.instance.collection("Users");
var newDocRef = users.doc();
var newDocId = newDocRef.id

users.add({
  'displayName': displayName,
  'uid': uid,
  'docID': newDocId
});

Upvotes: 0

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