How to Add/Update/Remove array elements in firebase firestore android using Hashmap? A Store Database
Good news guys, with the latest improvement to arrays you can add, update and remove an array element.
Check out this blog post: Better Arrays in Cloud Firestore!
You can do it like this
//Map to add user to array
final Map<String, Object> addUserToArrayMap = new HashMap<>();
addUserToArrayMap.put("arrayOfUsers", FieldValue.arrayUnion(mAuth.getCurrentUser().getUid()));
//Map to remove user from array
final Map<String, Object> removeUserFromArrayMap = new HashMap<>();
removeUserFromArrayMap.put("arrayOfUsers", FieldValue.arrayRemove(mAuth.getCurrentUser().getUid()));
//use either maps to add or remove user
db.collection("REFERENCE").document("mDocumentId")
.update(addUserToArrayMap);
Edit: September 12, 2018
Starting with August 28, 2018
, now it's possible to update array members. More informations here.
How to Add/Update/Remove array elements in firebase firestore?
The short answer is that you cannot! As in the official documentation regarding arrays:
Although Cloud Firestore can store arrays,
it does not support
querying array members or updating single array elements.
So there is currently no way to add, update or remove a single array element in a Cloud Firestore database.
Seeing your database schema I can say that you don't have any arrays. The availableProducts
is an object, beneath it there is a map named 0
which holds two String properties, spName
and spPrice
. If you want to update, let's say the price, please use the following code:
FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
DocumentReference ref = rootRef.collection("gdgsghs.cok").document("Shsheg");
Map<String, Object> availableProducts = new HashMap<>();
Map<String, Object> zeroMap = new HashMap<>();
Map<String, Object> product = new HashMap<>();
product.put("spPrice", 63.121);
zeroMap.put("0", product);
availableProducts.put("availableProducts", zeroMap);
ref.set(availableProducts, SetOptions.merge());
Your price will be updated from 67.368
to 63.121
.