Named Scope Example with Lambda and Group By Having

  named_scope :linked_to, 
  lambda { |ovs| { :select => "domain_objects.*, count(links.from_id) AS object_count", 
                   :conditions => [ "links.object_value_id IN (?)", ovs ], 
                   :joins => "INNER JOIN links ON links.from_id = domain_objects.id", 
                   :group => "links.from_id HAVING object_count >= #{ovs.size}" } }