Firebase DatabaseReference filter by given values
Suppose I have this JSON structure for Firebase:
And I need to get all questions that have a "from" attribute equal to "this".
I know that I can use Volley to create a StringRequest and get all the values from my questions. json. Then on the client side I could iterate over the answer and remove the ones that don't have the correct attribute, but that would only work if I have multiple questions. If I have millions of questions, I will have to iterate over these millions of questions.
Is there some way to put a filter on my query to only get a question with an attribute of my choice? (For example: search questions.json where from == this)
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2 answers
Try this if it might be helpful in your scenario
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference.child("questions").orderByChild("from").equalTo("this");
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
for (DataSnapshot issue : dataSnapshot.getChildren()) {
// do with your result
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
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