Module: StateMachineHistory

Included in:
StateMachine::Machine
Defined in:
lib/state_machine_history.rb

Defined Under Namespace

Classes: InvalidState

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/state_machine_history.rb', line 11

def self.included(base)
  base.class_eval do
    
    def track_history
      self.owner_class.class_eval do
        has_one :machine_log, :as => :loggable
      end
      
      before_transition(any => any) do |object, transition|
        MachineHistory.create(:loggable => object,
          :from_state=>transition.from_name.to_s, :to_state=>transition.to_name.to_s,
          :event=>transition.event.to_s )
      end
    end
    
    alias_method :define_event_helpers_original, :define_event_helpers

    def define_event_helpers
      define_event_helpers_original

      # Define the method which determines whether we visited a state before current or particular one
      define_instance_method(:was_there?) do |machine, object, from_state, to_state|
        to_state ||= object.state
        from_state = from_state.to_s
        to_state = to_state.to_s

        is_from_state = machine.states.detect {|item| item.name.to_s == from_state}
        raise InvalidState, "\"#{from_state}\" is an unknown state machine state" unless is_from_state
        
        is_to_state = machine.states.detect {|item| item.name.to_s == to_state}
        raise InvalidState, "\"#{to_state}\" is an unknown state machine state" unless is_to_state
        
        history = MachineHistory.find(:last, :conditions => {:loggable_id => object.id,
          :to_state => to_state})

        next false if history.nil?

        date = history.created_at
        is_state = MachineHistory.find(:last,
          :conditions => ["loggable_id = ? and from_state = ? and created_at <= ?",
          object.id, from_state, date])
        
        is_state ? true : false
      end
    end

  end
end