Selecting only one column in mongo db using morphia

Question

I have 2 columns String id, String Name and long age.

As we would have done in sql - select id FROM USERDETAILS Where Age > 5 would give me arrayList of primary keys that is "Id".

can anyone tell me how to do the same for mongo db using morphia.

I tried with query.retrieveFields(true,"id").get();

but it returns a USERDETAILS Model in return , i need only array of ids. how can i do this please help

Answer 1

You're going to get back your model class with morphia. That's what it does. If you want the raw list of IDs, you'll need to use the driver directly.