conflicting prince

conflictiingprince.rb

class SessionsController
  def create
    user = log_in_user
    user.send_current_notifications!
  end
  
  def log_in_user
    account = #sign in with params
    UserFactory.user_for_account(account)
  end
end

class Account < ActiveRecord::Base
end

class User
  attr_accessor :account
  
  def initialize(accout)
    self.account = account
  end
  
  def has_access?
    true
  end
  
  def send_current_notifications!
    #blank here, but probably delegating to something
    #else in a more complex example
  end
end

class DisabledUser < User
  def has_access?
    false
  end
  
  def send_current_notifications!
    account.send_disabled_notification!
  end
end

class UserFactory
  def self.user_for_account(account)
    class_for_account(account).send(:new, account)
  end
  
  private 
  def self.class_for_account(account)
    account.all_cards_invalid? ? DisabledUser : User
  end  
end