rachidcalazans

def save(state, params)
  if state == :in_progress
    return save_in_progress(params)
  elsif state == :done
    return save_done(params)
  elsif state == :on_review
    return save_on_review(params, :some_extra_param)
  end
end

rachidcalazans

def save(state, params)
  state_lambda = {
    in_progress: -> () { save_in_progress(params) },
    done:        -> () { save_done(params) },
    on_review:   -> () { save_on_review(params, :some_extra_param) }
  }

  state_lambda[state].call()
end

rachidcalazans

def index
  if current_user
    @posts = current_user.posts
   else
    @posts = List.public_posts
   end
end

rachidcalazans

class ApplicationController ...
...
  def current_user
    return GuestUser.new unless session[:user_id]
  
    User.find(session[:user_id])
  end
...
end

rachidcalazans

class GuestUser
  def posts
    List.public_posts # Exactly same method that took the Conditional Controller.
  end
end

rachidcalazans

def index
  @posts = current_user.posts
end

rachidcalazans

def index
  render :login unless current_user
end

rachidcalazans

class GuestUser
  def authenticated? 
    false
  end
end

class User
  def authenticated? 
    true
  end

rachidcalazans

def index
  render :login unless current_user.authenticated? 
end

rachidcalazans

Notification = Struct.new(:notifier_strategy, :receivers, :subject_msg, :content_msg) do

 def notify
  # The Notifier Strategy will be Email or iOS.
  notifier_strategy.notify(self)
 end
end