def method_missing(name, *args, &block)
      getter_name = name[0..-2]

      if name =~ /^[a-z]+=$/ && !respond_to?(getter_name)
        define_accessor(getter_name, args.first)
      else
        super
      end
    end
def method_missing(name, *args, &block)
      getter_name = name[0..-2]

      if name =~ /^[a-z]+=$/ && !respond_to?(getter_name)
        define_accessor(getter_name, args.first)
      else
        super
      end
    end
New values can be assigned to context on-the-fly,
 but it's not possible to change anything.