CODEWITHSUNDEEP
ruby
ted
ted

Reputation: 5329

ruby192: specific method calling

module B
  def stub
    extend()
  end

  def extend
    puts "B:extend"
  end
end

class A
  include B
  def extend
    puts "A:extend"
  end
end

a = A.new

a.stub 
# output: A:extend
# would like to have: B:extend

The question is:
How to make a.stub call extend method from module B without modifying B's code and without renaming A's method extend?

Upvotes: 1

Views: 90

Answers (4)

Pritesh Jain
Pritesh Jain

Reputation: 9146

My just another try.

A.class_eval do
 if self.include? B
   def extend
     super
   end
  end
end

A.new.stub
#=> B:extend

Correct me if this is a wrong approach.

Upvotes: 1

megas
megas

Reputation: 21791

def a.extend
  self.class.ancestors[1].instance_method(:extend).bind(self).call
end

Upvotes: 1

Stefan
Stefan

Reputation: 114218

include B adds B's methods to A so your method definition is overwriting B's implementation.

You could use the alias method to save a reference to B's method and implement your own stub method in A:

class A
  include B
  alias :b_extend :extend

  def stub
    b_extend
  end

  def extend
    puts "A:extend"
  end
end

A.new.stub
# B:extend

Upvotes: 3

halfelf
halfelf

Reputation: 10107

Maybe a monkey patch could solve this.

module B
  alias original_stub stub
  alias b_extend extend
  def stub
    b_extend
  end
end

But if your project does have many calls to original stub... each call should be modified.

Upvotes: 1

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