# File lib/aws/ec2/network_interface_collection.rb, line 71
      def groups_options options

        # accept this option a variety of different ways
        groups = options[:security_groups]
        groups ||= options[:security_group_ids]
        groups ||= options[:security_group]
        groups ||= options[:security_group_id]

        if groups
          [groups].flatten.map{|sg| sg.is_a?(SecurityGroup) ? sg.id : sg }
        else
          nil
        end

      end