Module: RailsExtensions::HabtmList::ClassMethods

Defined in:
lib/webpulser-habtm_list.rb

Instance Method Summary collapse

Instance Method Details

#has_and_belongs_to_many_with_list_handling(name, options = {}, &extension) ⇒ Object



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# File 'lib/webpulser-habtm_list.rb', line 15

def has_and_belongs_to_many_with_list_handling(name, options={}, &extension)
  if options.delete(:list)
    options[:extend] = RailsExtensions::HabtmList::AssociationListMethods

    after_add_callback_symbol = "maintain_list_after_add_for_#{name}".to_sym
    before_remove_callback_symbol = "maintain_list_before_remove_for_#{name}".to_sym
    name_ids = "#{name.to_s.singularize}_ids"
    name_ids_symbol = ":#{name_ids}"

    options[:after_add] ||= []
    options[:after_add] << after_add_callback_symbol

    options[:before_remove] ||= []
    options[:before_remove] << before_remove_callback_symbol

    class_eval <<-EOV
      def #{after_add_callback_symbol}(added)
        self.#{name}.add_to_list_bottom(added)
      end

      def #{before_remove_callback_symbol}(removed)
        self.#{name}.remove_from_list(removed)
      end

      def update_attributes_with_#{name_ids}(params)
        if params[#{name_ids_symbol}].kind_of?(Array)
          @list_ids ||= {}
          @list_ids[#{name_ids_symbol}] = params[#{name_ids_symbol}].reject(&:blank?)
        end

        update_attributes_without_#{name_ids}(params)
      end

      alias_method_chain :update_attributes, #{name_ids_symbol}
      after_save :reset_#{name}_position

      def reset_#{name}_position
        if @list_ids && @list_ids[#{name_ids_symbol}]
          self.#{name}.reset_positions_by_ids @list_ids[#{name_ids_symbol}]
        end
      end
    EOV
  end

  has_and_belongs_to_many_without_list_handling(name, options, &extension)
end