CODEWITHSUNDEEP
ruby
TieDad
TieDad

Reputation: 9939

How to overwrite extended method?

Sample code:

module B
  def f2
    puts "B::f2"
  end
end

class C
  def initialize
    extend B
  end

  def f2
    puts "C::f2"
  end
end

c = C.new
c.f2

Above sample code is an abstraction of my problem. Class C extends module B on fly (B is actually extended to instance of C). Method f2 from B doesn't meet my needs, so I want to overwrite f2. How to implement that?

Upvotes: 2

Views: 179

Answers (1)

Pavel Mikhailyuk
Pavel Mikhailyuk

Reputation: 2877

I actually don't like extending in initialize. There are many reasons to implement "plugin" in different way. But if you want to "shoot in the foot" this way, ok, just do one more extend:

module B
  def f2
    puts 'B::f2'
  end
end

class C
  attr_reader :parent_state

  def initialize
    extend B
    extend BOverrides

    @parent_state = 'Parent State'
  end

  module BOverrides
    def f2
      puts 'C::f2'
      puts 'Yes, I have access to %s' % parent_state
    end
  end
end

c = C.new
c.f2

Upvotes: 2

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