can I do unscoped inside filter

I override self.records methods

def self.records(options = {})
  Course.index_page
end

which return courses that have index flag.

in a filter, I'd like to return all courses that I've purchased.

  filter :paid, apply: ->(records, _value, _options) {
    records.unscoped.where(id:  some_ids)
  }

an error was returned if some_ids includes course that doesn't have index flag.

Internal Server Error: undefined method id' for nil:NilClass /../../gems/jsonapi-resources-ad12cbab49cf/lib/jsonapi/resource_serializer.rb:59:in block in serialize_to_hash'

do I implement it in a wrong way, or some issues here?

Start with the custom records method and the filter :paid callback, then inspect jsonapi/resource_serializer.rb at line 59. Reproduce the failure with some_ids containing a course without the index flag and determine whether the unscoped result matches the serializer's expectations; done means the behavior is clarified and covered by an appropriate regression test or documented as unsupported.