Is there any possible way I can order the Cloud Firestore documents of a collection based on a number at a value of a specific field. For example in the collection
ids there are documents and in each one there is a field called
idNumber. The value of that idNumber is 0 then in the next document is 1 then 2 etc. Is it possible?
Thanks in advance!
Is it possible?
Yes it is! To order the documents within a collection by a specific numeric property, please use the following query:
FirebaseFirestore rootRef = FirebaseFirestore.getInstance(); CollectionReference idsRef = rootRef.collection("ids"); Query query = idsRef.orderBy("idNumber", Query.Direction.ASCENDING);
This query will order your documents according to the
idNumber property ascending. If you want a reverse order just change the direction to
DESCENDING. That’s it!
According to the official documentation of Query’s orderBy(String field) method:
Creates and returns a new Query that’s additionally sorted by the specified field.
And according to Query’s orderBy(String field, Query.Direction direction) method:
Creates and returns a new Query that’s additionally sorted by the specified field, optionally in descending order instead of ascending.