Pros of missing_method()

question_answer.rb

class Question
  def get_question_title
    puts "get_question_title called"
  end
  
  def get_question_content
    puts "get_question_content called"
  end
end


class Answer
  def initialize
    @question = Question.new
  end
  
  def get_question_title
    @question.get_question_title
  end
  
  def get_question_content
    @question.get_question_content
  end
  
  # Methods above is duplicate with methods in class Question.
  # It look like copy-paste the existing methods and then modifying them
end

question_answer_refactored.rb

class Question
  def get_question_title
    puts "get_question_title called"
  end
  
  def get_question_content
    puts "get_question_content called"
  end
end


class Answer
  def initialize
    @question = Question.new
  end
  
  def method_missing(name, *args)
    @question.send(name, *args)
  end
  
  # Answer now is Dynamic Proxy, it forward each method inner Question class. If you add any method into Question
  # then Answer will work without any changes.
end