Question

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?

Answer 1

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