Flutter firebase check email exist inside firestore collection

Question

I need to just check if user email exist in user collection or not. Right now I am doing like this

var check =  await FirebaseFirestore.instance.collection('users')
 .where('email', isEqualTo: userData['email']).snapshots();

But when I print check its showing

Instance of '_MapStream<QuerySnapshotPlatform, QuerySnapshot<Map<String, dynamic>>>'

How can I check that email exist in that collection or not ? Thanks 😊

Answer 1

you can try or take reference form this method let me know if this solves your problem

 static Future<bool> emailCheck(String email) async {
  bool result = false;
   QuerySnapshot snapshot = await 
   FirebaseFirestore.instance.collection('Users').get();
   snapshot.docs.forEach((f) {
    if (f['email'] ==email) {
      result =true;
    }
     });
 return result;
   }

Answer 2

Your check variable is a QuerySnapshot object, while you seem to want it to be a boolean that indicates whether the query had any results.

To get that:

var query = FirebaseFirestore.instance.collection('users')
 .where('email', isEqualTo: userData['email']).limit(1);
var snapshot = await query.snapshots();
var check = query.size > 0;

Note that I also added a limit(1) to the query, since you never need to read more than one document to determine if any matches exist.