require "date" require_relative "db" Sequel::Model.plugin :timestamps class Entity < Sequel::Model one_to_many :notes one_to_many :sources one_to_one :title many_to_many :tags one_to_one :url def add_tag(tag) DB[:entities_tags].insert(entity_id: self.id, tag_id: tag.id, created_at: DateTime.now) end end class Note < Sequel::Model many_to_one :entity end class Source < Sequel::Model many_to_one :entity many_to_one :source, class: :Entity end class Title < Sequel::Model many_to_one :entity end class Tag < Sequel::Model many_to_many :entities end class Url < Sequel::Model one_to_one :entity end