Having each User have their own data - Flutter - Firebase

Question

I'm adding data to FireStore like this :

onPressed: () async {
  // signInAnonymously();
  UserCredential userCredential =
      await FirebaseAuth.instance.signInAnonymously();
  addReminderToFirebase();
  validateForm();
},

.

Future<DocumentReference> addReminderToFirebase() {
  return FirebaseFirestore.instance
      .collection('Reminders')
      .add(<String, dynamic>{
    'text': "Remember to do Laundry",
    'timestamp': DateTime.now(),
    'userId': FirebaseAuth.instance.currentUser!.uid,
  });
}

Currently I have documents everyone has access to it's all mixed up

How do I make each user have their own data ? Not accessible by anyone else ?

Zeeshan Ahmad · Accepted Answer · 2021-07-30 03:56:39Z

1

You should fetch the data of the specific user by using their userId.

You can fetch current user data by using the following snippet.

await FirebaseFirestore.instance
        .collection('Reminders')
        .where('userId', isEqualTo: FirebaseAuth.instance.currentUser!.uid);

answered Jul 30, 2021 at 3:56

Zeeshan Ahmad

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7 Comments

Sunshine Over a year ago

How would I implement it in my code ? I don't see where

Sunshine Over a year ago

I don't understand how I then add my data ^^? I'd like to upVote but I need 10 more points

Zeeshan Ahmad Over a year ago

You should add this code where you are displaying reminders. In this way, only the reminders of a currently logged user will be fetched and displayed.

Sunshine Over a year ago

ok thank you - how do I grab a value from this document ?

Sunshine Over a year ago

I'd like to upvote your answer but it doesn't allow me to

|

Dharmaraj · Accepted Answer · 2021-07-30 05:00:34Z

1

It seems you have a field userId which can be used to get creator of that reminder. You can check if the user requesting the reminder is the same person i.e. the UID of requester is same as the userId field. Try these security rules:

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /Reminders/{reminderId} {
      allow read, write: if request.auth != null && resource.data.userId == request.auth.uid;
    }
  }
}

Then to fetch reminders of a single user you can use queries

var currentUser = FirebaseAuth.instance.currentUser
if (currentUser) {
 remindersCollection.where("userId", "==", currentUser.uid)
}

answered Jul 30, 2021 at 5:00

Dharmaraj

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