Module: DataMapper::Is::StateMachine

Defined in:
lib/dm-is-state_machine/is/data/event.rb,
lib/dm-is-state_machine/is/data/state.rb,
lib/dm-is-state_machine/is/data/machine.rb,
lib/dm-is-state_machine/is/dsl/event_dsl.rb,
lib/dm-is-state_machine/is/dsl/state_dsl.rb,
lib/dm-is-state_machine/is/state_machine.rb

Defined Under Namespace

Modules: Data, EventDsl, InstanceMethods, StateDsl Classes: DuplicateStates, EventConfusion, InvalidContext, InvalidEvent, InvalidState, NoInitialState

Instance Method Summary collapse

Instance Method Details

#inherited(base) ⇒ Object 



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# File 'lib/dm-is-state_machine/is/state_machine.rb', line 71

def inherited(base)
  super
  base.class_eval do
    @is_state_machine = superclass.instance_variable_get(:@is_state_machine)
  end
end

#is_state_machine(options = {}, &block) ⇒ Object

Makes a column (‘state’ by default) act as a state machine. It will define the property if it does not exist.

Examples:

Usage 

is :state_machine
is :state_machine, :initial => :internal
is :state_machine, :column => :availability
is :state_machine, :column => :availability, :initial => :external

Parameters:

  • options (Hash) (defaults to: {}) —

    a hash of options

  • :column<Symbol> (Hash) —

    a customizable set of options



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# File 'lib/dm-is-state_machine/is/state_machine.rb', line 26

def is_state_machine(options = {}, &block)
  extend DataMapper::Is::StateMachine::EventDsl
  extend DataMapper::Is::StateMachine::StateDsl
  include DataMapper::Is::StateMachine::InstanceMethods

  # ===== Setup context =====
  options = { :column => :state, :initial => nil }.merge(options)
  column  = options[:column]
  initial = options[:initial].to_s
  unless properties.detect { |p| p.name == column }
    property column, String, :default => initial
  end
  machine = Data::Machine.new(column, initial)
  @is_state_machine = { :machine => machine }

  class_eval <<-RUBY, __FILE__, __LINE__ + 1
    def #{column}=(value)
      value = value.to_s if value.kind_of?(Symbol)
      attribute_set(#{column.inspect}, value)
    end
  RUBY

  # ===== Define callbacks =====
  # TODO: define callbacks
  # before :save do
  #   if self.new_record?
  #     # ...
  #   else
  #     # ...
  #   end
  # end

  before :destroy do
    # Do we need to do anything here?
  end

  # ===== Setup context =====
  push_state_machine_context(:is)

  yield if block_given?

  # ===== Teardown context =====
  pop_state_machine_context
end