To give you a better example, let's start with this snippet:

class Document
    ...
  @@riddle=Riddle::Client.new

  scope :search, ->(query){
    where(:document_id.in => sphinx_get_ids(query))
  }

  def self.sphinx_get_ids(query)
    @@riddle.query(query)[:matches].collect {|match| match[:attributes]["doc_id"]}
  end

end

Don't mind class variable just for now.

What I would like to do is pass precise values of skip and limit that are present at the moment to Riddle selector before actually passing the critera to Moped.

So I can

# do this
Document.search('graceful aubergine').page(5).per(10)
# exactly like this, without any unnecessary fetching
Document.where(:field.gt => 10).page(5).per(10)

Latter call is paginated perfectly, but former one will require some overhead, because Sphinx will return all IDs and only after that they will be paginated. Creating a query having "in" clause with thousands of IDs to select 10 of them seems inappropriate, to say the least.

Is it possible in current version of Mongoid/Origin, and if it's not, does it look like something to be implemented somewhere soon?