Module: Reactor::Attributes::LinkListExtender

Defined in:
lib/reactor/attributes/link_list_extender.rb

Class Method Summary collapse

Class Method Details

.extend_given_linklist!(klass) ⇒ Object 



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# File 'lib/reactor/attributes/link_list_extender.rb', line 12

def self.extend_given_linklist!(klass)
  unless klass.instance_methods(false).include?("changed?")
    klass.class_eval do
      def <<(link_data)
        super(transform_into_link(link_data))
      end

      def []=(idx, value)
        super(idx, transform_into_link(value))
      end

      # install #size_changed callback
      Array.instance_methods(false).each do |meth|
        old = instance_method(meth)
        define_method(meth) do |*args, &block|
          detect_modification do
            old.bind(self).call(*args, &block)
          end
        end if meth.to_sym != :map
      end

      def changed?
        @changed == true || temporary_links_present?
      end

      def change!
        @changed = true
      end

      def original_link_ids
        @original_link_ids ||= link_ids
      end

      protected
      def link_ids
        self.map(&:id).compact
      end

      def temporary_links_present?
        self.any? {|l| l.kind_of? Reactor::Link::TemporaryLink }
      end

      def detect_modification(&block)
        original_link_ids
        yield.tap do
          @changed = @changed || original_link_ids != link_ids
        end
      end

      def transform_into_link(link_data)
        if (link_data.respond_to?(:external?) && link_data.respond_to?(:internal?))
          link_data
        else
          Reactor::Link::TemporaryLink.new(link_data)
        end
      end
    end
  end
end

.extend_linklist! ⇒ Object 



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# File 'lib/reactor/attributes/link_list_extender.rb', line 7

def self.extend_linklist!
  # this will trigger rails autoload
  extend_given_linklist!(RailsConnector::LinkList)
end