# File lib/mongoid/fields/mappings.rb, line 23
      def for(klass, foreign_key = false)
        return Serializable::Object unless klass
        if foreign_key
          return "#{MODULE}::ForeignKeys::#{klass.to_s.demodulize}".constantize
        end
        begin
          "#{MODULE}::#{klass.to_s.demodulize}".constantize
        rescue NameError
          klass
        end
      end