Nsryjdtyk

I am trying to update a field of existing document in my collection in FireBase Firestore. I want to search that document using one of its field.
My collection name is "complaints",
My document's structure looks like --

complainant_Name: "XYZ"

complaint_Details : "some random details"

e_Mail: "xyz@gmail.com"

id: 5

phone_No: "1234567890" 

I want to search documents and if "id" field of a document is say 5, I want to update it say change "complainant_Name" field to "ABC". How to write the code for this query in java android? I couldn't find any code source which tells how to update after searching in Firebase Firestore.

To solve this, please use the following lines of code:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();

CollectionReference complaintsRef = rootRef.coolection("complaints");

complaintsRef.whereEqualTo("id", 5).get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {

    @Override

    public void onComplete(@NonNull Task<QuerySnapshot> task) {

        if (task.isSuccessful()) {

            for (QueryDocumentSnapshot document : task.getResult()) {

                Map<Object, String> map = new HashMap<>();

                map.put("complainant_Name", "ABC");

                complaintsRef.document(document.getId()).set(map, SetOptions.merge());

            }

        }

    }

});

After using this code, the property complainant_Name will hold the value of ABC.