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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

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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()) } }); }
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  • Please Read Description to Understand What I'm trying to say Commented Nov 10, 2021 at 2:46
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    I'm not sure I understand. What is the exact data you want to check for existence? Commented Nov 10, 2021 at 6:07
  • The question seems to be unclear. Can you describe the question in detail and state clearly what you want to achieve? Commented Nov 10, 2021 at 8:19
  • @AlexMamo I want to to check in Users collection is Refferal "ABC123" exists if exists who is the user then i fetch the mobile or other details Commented Nov 10, 2021 at 13:34
  • I want to fetch all the documents to check where ABC123 exists or not to give him refferal amount Commented Nov 10, 2021 at 13:35

2 Answers 2

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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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7 Comments

how you reply with my comment is that any inbuilt feature of Stackoverflow of Manually Copy and paste the text
I only used > in front of your comments, that were added as copy/paste.
what will i do when someone enters the wrong ReferCode that was not exists in the database because i tried addOnFailureLister but that was not executed when enters the wrong code. ? ? ?
No, onFailure will be called only if Firebase servers reject the request. It will not be triggered if no documents will be returned
so what i used to check if no documents will be returned i want to set error in edit text by binding.referEd.setError("Wrong refer code")
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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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i don't have the document id

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