I am writing a flight planner for android. For the use of a certain REST API I need ICAO identifiers for each airport. I am trying to fetch about 14k documnets from firestore and map them to objects.
Structure of my firestore:
In the result I got exacly 7698 documents in return every time.
val db = Firebase.firestore
val airports = db.collection("airport")
val myColl : ArrayList<AirportDAO> = arrayListOf()
val start = System.currentTimeMillis()
var end : Long
airports.get().addOnSuccessListener {
end = System.currentTimeMillis()
Log.d("firebase", (end - start).toString())
val docs = it.documents
Log.d("size", it.size().toString()) // <-- 7698
for (doc in docs) {
val a = doc.toObject(AirportDAO::class.java)
if (a != null)
myColl.add(a)
}
Log.d("size", myColl.size.toString()) // <-- 7698
}
Method get() should return all DocumentSnapshots. Are there any limitations I am not aware of?
@Edit: End of my collection. "Filtruj" means "Sort" in Polish
Adding a listener on the following reference:
val airports = db.collection("airport")
It means that want to get all AirportDAO objects that exist within your airport collection. If the size of your myColl list is 7698, it means that you'll be charged with 7698 read operation when you access that collection, which in my opinion is pretty much.
I have exactly 14110 documents in my collection.
No, you don't! You have exactly 7698, that's what your code says.
If you want to filter the results, you should use Query. If you'll always need all of them, then you'll create a heavy traffic with Firestore.