Question 128515 in Android Studio Question posted in
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Android Studio – Checking Firestore Collection element exist or not

I want to check the entered text (EditText) element is exist or not using Firestore Collection if Exists where exists or fetch the remain elements Note: we don’t have document id

I want to mobile if our user collection the mobile exists then fetch the remain elements the document id will Random using AutoID and ignore Additional Collections like Withdraw Requests

Details
Details

I write this code in my activity

private void fetchDatafromFirestoreCollection() {

    firestore.collection("Users").addSnapshotListener(new EventListener<QuerySnapshot>() {
        @Override
        public void onEvent(@Nullable QuerySnapshot value, @Nullable FirebaseFirestoreException error) {
            if (error != null) {
                if (dialog.isShowing())
                    dialog.dismiss();

                Log.e(TAG, "Error is: ", error);
                return;

            }
            for (DocumentChange documentChange : value.getDocumentChanges())
        }
    });

}
Tags:

2

Answers


  1. 0

    Make the document structure like this one:

        DocumentReference docRef = db.collection("Users").document("123456789");
                docRef.addSnapshotListener(new EventListener<DocumentSnapshot>() {
                    @Override
                    public void onEvent(DocumentSnapshot snap, FirestoreException fe) {
                        if (snap.exists()) {
                            //exists
                        for (DocumentChange dc : snap.getDocumentChanges()) {
                            //Store exist information to your Object model.
                            UserInfo userinfo = dc.getDocument().toObject(UserInfo.class);
                         Log.e(TAG, "userinfo: "+userinfo.getCompany);
                        }
                        } else {
                            //not exists
                        }
                    }
    
                });

    Hope its work..

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  2. 0

    According to this comment:

    I want to to check in Users collection is ReferCode "ABC123" exists if exists who is the user then I fetch the mobile or other details

    And this comment:

    I want to fetch all the documents to check where ABC123 exists or not to give him refferal amount.

    To solve this, you have to use a query that looks like this:

    FirebaseFirestore db = FirebaseFirestore.getInstance();
CollectionReference usersRef = db.collection("Users");
usersRef.whereEqualTo("ReferCode", "ABC123").get()
    .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
        @Override
        public void onComplete(@NonNull Task<QuerySnapshot> task) {
            if (task.isSuccessful()) {
                for (QueryDocumentSnapshot document : task.getResult()) {
                    String mobile = document.getString("Mobile");
                    Log.d("TAG", mobile);

                    //Do what you need to do with the phone number
                }
            } else {
                Log.d(TAG, "Error getting documents: ", task.getException());
            }
        }
    });

    The result in the logcat will be:

    9876543210
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