Question

Let’s say we have code looks like this

module TM
  def aa
    puts "aa"
  end

  def bb
    TM::aa
  end

  module_function :bb
end

TM.bb

Why bb cannot access aa by no matter “TM::aa”, “self.aa” or “TM.aa”? They are in the same module. What is the benefit of setting such restriction and how do I solve the “undefined method” error?

Answer 1

Did you mean something like this?

module TM
  class << self
    def aa
      puts "aa"
    end

    def bb
      TM::aa
    end
  end
end

TM.bb

UPDATE: methods as you defined them will be accessible as instance methods when you include your module or class methods if you extend your class

module TM
  def aa
    puts "aa"
  end

  def bb
    aa
  end
end

class A
  include TM
end

class B
  extend TM
end

A.new.bb

B.bb