Firebase multiple WHERE clause in query [duplicate]

Answer 1

The Realtime Database does not support multiple where clauses but you can create an extra key to make it possible.

A "flight" in your "flight" list can have a combined key for "arrivalDate" and "code".

"1ddf3c02-1f2e-4eb7-93d8-3d8d4f9e3da2" : {
  "airport" : "Gothenburg, Sweden - Landvetter (GOT)",
  "arrivalDate" : "2016-06-21",
  "arrivalTime" : "20:58",
  "arrivalDate_code": "2016-06-21_GOT", // combined key
  "code" : "GOT",
  "departureDate" : "2016-06-23",
  "departureTime" : "20:58"
}

Then you can query for that key.

Firebase ref = mFirebaseRef.child(FirebaseReference.CHILD_FLIGHTS);
Query queryRef = ref.orderByChild("arrivalDate_code").equalTo("2016-06-21_GOT");
queryRef.addListenerForSingleValueEvent(new ValueEventListener() {
   @Override
   public void onDataChange(DataSnapshot dataSnapshot) {

   }
});

Another option is to key off of a field in the data structure:

/ flights
  / $code
    / $flight_id

This means your data would look like this:

"flight" : {
  "GOT": {
    "1ddf3c02-1f2e-4eb7-93d8-3d8d4f9e3da2" : {
      "airport" : "Gothenburg, Sweden - Landvetter (GOT)",
      "arrivalDate" : "2016-06-21",
      "arrivalTime" : "20:58",
      "code" : "GOT",
      "departureDate" : "2016-06-23",
      "departureTime" : "20:58"
    }
  }
}

And then you could formulate a query like this:

Firebase ref = mFirebaseRef.child(FirebaseReference.CHILD_FLIGHTS);
Query queryRef = ref.child("GOT").orderByChild("arrivalTime").equalTo("2016-06-21_GOT");
queryRef.addListenerForSingleValueEvent(new ValueEventListener() {
   @Override
   public void onDataChange(DataSnapshot dataSnapshot) {

   }
});