module ::Mongoid
  module Document
    def remove_logo
      logo=self.logo
      unless logo.blank?
        id = BSON::ObjectId.from_string(logo['grid_id'])
        MongoGrid.grid.delete(id)
      end
    end

    def remove_avatar
      attach=self.avatar
      unless attach.blank?
        id = BSON::ObjectId.from_string(attach['grid_id'])
        MongoGrid.grid.delete(id)
      end
    end
    def remove_attach 
      attach=self.attach
      unless attach.blank?
        id = BSON::ObjectId.from_string(attach['grid_id'])
        MongoGrid.grid.delete(id)
      end
    end
  end
end