Design Pattern: State and Combination Locks

unlocked_state.rb

class UnlockedState
  attr_reader :lock, :state_name
  
  def initialize(lock)
    @lock = lock
    @state_name = 'Unlocked State'
  end
  
  def dial_to(number)
    puts 'The lock is unlocked. Dial does nothing.'
  end
  
  def clear
    puts 'The lock is unlocked. Clear does nothing.'
  end
  
  def pull_to_open
    puts 'The lock is unlocked. Pull does nothing.'
  end
  
  def push_to_lock
    lock.state = lock.cleared_state
  end
end