小编dyn*_*nex的帖子

在本文的启发下,我正在使用Ruby方法调用层次结构并注意到一些奇怪的东西.

鉴于:

class B
  def foo  
    "- Instance method defined by B"
  end  

  def method_missing(method)
    puts "- method_missing (#{method}) on b. Redirecting to b.foo\n"
    foo
  end
end

b = B.new

def b.foo  
  "- Method defined directly on an instance of B\n" + super  
end

def b.method_missing(method)
  "- method_missing (#{method}) on b. Calling super\n" + super
end

puts "Calling 'bar' on b of type #{b.class}:"
puts b.bar

运行它给出:

Calling 'bar' on b of type B:
- method_missing (bar) on …