# Imagine we have this logic on stackoverflow:
# A user can post a question on a stackoverflow, after posting an email notification is sent to
# all users have interest in the question topic, a post is shared on the user profile with a link to the question he posted

class SOFQuestionNotifier
  def initialize(question)
    @question = question
  end

  def save
    @question.save && post_to_wall && queue_emails
  end 

private

  def post_to_wall
  end
  def queue_emails
  end
end

# app/controllers/questions_controller
def create
  @question = SOFQuestionNotifier.new(Question.new(params[:question]))
  if @question.save
    # Success
  else
    # Error
  end
end