lnagel/event-sourced-accounting

require 'esa/associations/amounts_extension'
require 'esa/traits/extendable'

module ESA
  # The Event class represents an event of significance to accounting,
  # which triggers the creation of Flags, which in turn create Transactions.
  #
  # @author Lenno Nagel
  class Event < ActiveRecord::Base
    include ESA::Traits::Extendable
    extend ::Enumerize

    attr_accessible :time, :nature, :accountable, :ruleset
    attr_readonly   :time, :nature, :accountable, :ruleset

    belongs_to :accountable, :polymorphic => true
    belongs_to :ruleset
    has_many   :flags
    has_many   :transactions, :through => :flags
    has_many   :amounts, :through => :transactions, :extend => ESA::Associations::AmountsExtension

    enumerize :nature, in: [:unknown, :adjustment]

    after_initialize :initialize_defaults
    validates_presence_of :time, :nature, :accountable, :ruleset
    validates_inclusion_of :processed, :in => [true, false]

    private

    def initialize_defaults
      self.time ||= Time.zone.now if self.time.nil?
      self.ruleset ||= Ruleset.extension_instance(self.accountable) if self.ruleset_id.nil? and not self.accountable_id.nil?
      self.processed ||= false
    end
  end
end