Filter included resources or way around it

Hi,

Is there currently a way of filtering resources that are included to our response?

ie: I want to get and include books with that response I'll just do

address/shelves?include=books

but what if I would like to filter by only available books?

ie: address/shelves/?include=books&filter[books.available]=true

books.available is just a scope in this case

or is the preffered method to do this by declaring additional relationships in the shelf resource?
like below

class ShelfResource < JSONAPI::Resource
  has_many :books
  has_many :available_books
  ...
end

If the latter, how do I exactly specify the method for finding resources for this relationship?

I've tried that already by adding

def records_for_available_books
  _model.books.available
end

to the shelf resource but I keep getting errors when doing that.

Inizia dalla relazione has_many :books di ShelfResource e dal metodo records_for_available_books, quindi segui come vengono gestiti include e filter[books.available]. Riproduci gli errori segnalati e confronta la dichiarazione della relazione con la risposta filtrata richiesta. Il lavoro è completato quando è stato stabilito il modo supportato per filtrare i libri inclusi e l'esempio funziona, oppure quando vengono documentati il limite e l'approccio alla relazione preferito.