Module: DataMapper::Tags::ClassMethods

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# File 'lib/dm-tags/dm_tags.rb', line 22

def has_tags_on(*associations)
  associations.flatten!
  associations.uniq!

  has n, :taggings, Tagging, :child_key => [ :taggable_id ], :taggable_type => self

  before :destroy, :destroy_taggings

  unless instance_methods(false).include?('destroy_taggings')
    class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def destroy_taggings
        taggings.destroy!
      end
    RUBY
  end

  private :taggings, :taggings=, :destroy_taggings

  extend(DataMapper::Tags::SingletonMethods)

  associations.each do |association|
    association = association.to_s
    singular    = DataMapper::Inflector.singularize(association)

    class_eval <<-RUBY, __FILE__, __LINE__ + 1
      property :frozen_#{singular}_list, Text

      has n, :#{singular}_taggings, Tagging, :child_key => [ :taggable_id ], :taggable_type => self, :tag_context => '#{association}'
      has n, :#{association},       Tag,     :through => :#{singular}_taggings, :via => :tag, :order => [ :name ]

      before :save, :update_#{association}

      def #{singular}_list
        @#{singular}_list ||= #{association}.map { |tag| tag.name }
      end

      def #{singular}_list=(string)
        @#{singular}_list = string.to_s.split(',').map { |name| name.gsub(/[^\\w\\s_-]/i, '').strip }.uniq.sort
      end

      alias_method :#{singular}_collection=, :#{singular}_list=

      def update_#{association}
        self.#{association} = #{singular}_list.map do |name|
          Tag.first_or_new(:name => name)
        end

        self.frozen_#{singular}_list = #{singular}_collection
      end

      ##
      # Helper methods to make setting tags easier
      #
      def #{singular}_collection
        #{association}.map { |tag| tag.name }.join(', ')
      end

      ##
      # Like tag_collection= except it only add's tags
      #
      def add_#{singular}(string)
        tag_names = string.to_s.split(',').map { |name| name.gsub(/[^\\w\\s_-]/i, '').strip }
        @#{singular}_list = tag_names.concat(#{singular}_list).uniq.sort
      end
    RUBY
  end
end

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# File 'lib/dm-tags/dm_tags.rb', line 94

def taggable?
  false
end