class ActiveFedora::RelsExtDatastream

def to_solr(solr_doc = Solr::Document.new)
  self.relationships.each_pair do |subject, predicates|
    if subject == :self || subject == "info:fedora/#{self.pid}"
      predicates.each_pair do |predicate, values|
        values.each do |val|
          solr_doc << Solr::Field.new("#{predicate}_s" => val)
        end
      end
    end
  end
  return solr_doc
end