ruby - 覆盖方法然后还原

Question

我正在尝试找到一种方法，我可以覆盖一个方法，做一些事情，然后在不留下任何工件的情况下恢复。

我已经使用 mocha 实现了这个，但显然这不会在生产应用程序中运行。请注意，新方法有参数，而旧方法没有。

例子如下

require 'rubygems'
require 'mocha'

class Example

  def to_something
    self.stubs(:attribs => other(1))
    r = attribs_caller
    self.unstub(:attribs)
    r
  end

  def other(int)
    {"other" => int }
  end

  def attribs_caller
    attribs
  end

  def attribs
    {"this" => 1 }
  end

end

a1 = Example.new

puts a1.attribs_caller  #=> this1
puts a1.to_something    #=> other1
puts a1.attribs_caller  #=> this1

Answer 1

class String
  alias orig_reverse reverse
  def reverse(n)
    'fooled you. '*n
  end
end

puts "ab".reverse(2)
#=> fooled you fooled you

# clean up:
class String
  alias reverse orig_reverse
  remove_method(:orig_reverse)
end

puts "ab".reverse #=> ba