在Ruby中，我怎样才能找到方法所在的类？

我怎样才能知道在Ruby中定义了一个方法的类

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例如，假设我想知道哪些类实现了

to\s

方法。如何使用

ri

命令进行编辑？

编辑|由于您编辑了您的问题，此答案毫无意义；）断章取义

~$ ri

Enter the method name you want to look up.
You can use tab to autocomplete.
Enter a blank line to exit.

>> to_s

= .to_s

(from gem actionpack-3.1.0.rc6)
=== Implementation from ActionDispatch::RemoteIp::RemoteIpGetter
------------------------------------------------------------------------------
  to_s()

------------------------------------------------------------------------------


(from gem actionpack-3.1.0.rc6)
=== Implementation from ActionView::FileSystemResolver
------------------------------------------------------------------------------
  to_s()

------------------------------------------------------------------------------


(from gem actionpack-3.1.0.rc6)
=== Implementation from ActionView::FixtureResolver
------------------------------------------------------------------------------
  to_s()

非常有效的方法。我个人不明白你为什么需要这个：

class ClassEnumerator
  def each(&block)
    ObjectSpace.each_object(Class, &block)
  end

  include Enumerable
end

ClassEnumerator.new.select { |klass| klass.instance_methods.include?(:merge) }

这应该可以找到所有实现

#merge

的类

pry(main)> ClassEnumerator.new.select { |klass| klass.instance_methods.include?(:merge) }
=> [OptionParser::CompletingHash,
 OptionParser::OptionMap,
 Hash,
 Gem::Dependency,
 Psych::Omap,
 Psych::Set,
 URI::MailTo,
 URI::LDAPS,
 URI::LDAP,
 CodeRay::CaseIgnoringWordList,
 CodeRay::WordList,
 URI::HTTPS,
 URI::HTTP,
 URI::FTP,
 URI::Generic]
pry(main)> 

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您也可以键入

ri方法\u NAME

参见

man ri

您能举个例子说明您想做什么吗？