sample.rb

class User < Ohm::Model

  set :requests, :Request

end

class Request < Ohm::Model

  attribute :path
  attribute :processed
  attribute :origin

  index :path
  index :processed

end

search = Custom::Search.new("string to search")
ids_found = search.ids
# ids_found == ["1", "3", "5"]

user = User[1]
requests = user.requests
# requests.map(&:id) == ["1", "2", "3", "5", "6", "7"]

#here I would need to remove from requests the ones that DOESN'T match the ids in ids_found
#code continues and I need to apply more filters

if processed
  requests.find(processed: true)
end

if path
  requests.find(path: path)
end

found = requests.sort(:limit => [0, 50])