ticket.rb

gistfile1.rb

# -*- coding: utf-8 -*-
class Ticket
  # Дложно выполняться условие:
  # Пары Edges[0], Edges[2] должны быть уникальны.
  Edges = [ [ :new,      :open,      'confirm'    ],
            [ :new,      :closed,    'throw_away' ],
            [ :open,     :assigned,  'assign'     ],
            [ :assigned, :solved,    'solve'      ],
            [ :solved,   :closed,    'close'      ],
            [ :solved,   :assigned,  'assign'     ],
            [ :closed,   :open,      'reopen'     ] ]

  def initialize
    @state = Edges[0].first
  end

  def available_actions
    Edges.select{ |e| e.first == @state }
  end

  def method_missing method_name, *args
    # Проверяем имя метода. Если 'do_*****', то дергаем +do_action+
    action = method_name.to_s[3..-1]
    if available_actions.map{ |a| a.last }.include? action
      self.send 'do_action', action
    else
      super
    end
  end

  private
  
  def do_action action_name
    puts "Performing '#{action_name}'"
    @state = Edges.find{ |e| e.last == action_name }[1]
  end
end