Module: ErpWorkEffort::Extensions::ActiveRecord::ActsAsRoutable::ClassMethods

Defined in:
lib/erp_work_effort/extensions/active_record/acts_as_routable.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_routable ⇒ Object 



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# File 'lib/erp_work_effort/extensions/active_record/acts_as_routable.rb', line 11

def acts_as_routable
  extend ActsAsRoutable::SingletonMethods
  include ActsAsRoutable::InstanceMethods

  # If we knew the models that would be routable, we could use Russell's has_many_polymorphic plugin
  # to define the relationship between those models and TransportationRoutes. Since acts_as_routable
  # is used on demand, we have to mimic the behavior of the plugin, but from the opposite direction,
  # to properly form the bidirectional many-to-many relationship we want.

  inheriting_class_name = self.name

  # Add has_many_through association to the Routes table
  TransportationRoute.class_exec do
    has_many inheriting_class_name.tableize.to_sym,
        :through => :associated_transportation_routes,
        :source => inheriting_class_name.tableize.singularize.to_sym,
        :conditions => ["associated_transportation_routes.associated_record_type = ?", inheriting_class_name],
        :dependent => :destroy

    @associated_models << inheriting_class_name.tableize
  end

  # Add linking association to the polymorphic join table
  AssociatedTransportationRoute.class_exec do
    belongs_to inheriting_class_name.tableize.singularize.to_sym,
        :class_name => inheriting_class_name,
        :foreign_key => "associated_record_id"
  end

  # Add associations back to routes to the class using this mixin
  has_many :associated_transportation_routes, :as => "associated_record", :dependent => :destroy
  has_many :routes, :through => :associated_transportation_routes, :source => :transportation_route, :dependent => :destroy
end