如何在ruby中调用一系列模块中定义的超级方法

Question

是否可以让c1.say显示“lalala”而不改变M1，M2，C1？即，使用额外的模块来覆盖M2的方法？谢谢，

module M1
  def word
    "lalala"
  end
end

module M2
  def word
    super + 'wawawa'
  end
end

class C1
  include M1
  include M2
  def say
    puts word
  end
end

c1 = C1.new
c1.say # lalalawawawa

Answer 1

您可以随时修改任何类，而无需更改其原始代码。

module M1
  def word
    "lalala"
  end
end

module M2
  def word
    super + 'wawawa'
  end
end

class C1
  include M1
  include M2
  def say
    puts word
  end
end

# patch M2
M2.class_eval do
  def word
    super
  end
end

# or patch C1
# C1.class_eval do
#   def word
#     'lalala'
#   end
# end


c1 = C1.new
c1.say
# >> lalala