ruby-on-rails - MongoMapper + 级联删除？

Question

MongoMapper with Identity Map 是否支持级联删除？它似乎并不是真的，但我可能在文档中的某处遗漏了一些东西。请考虑以下事项:

class User
  include MongoMapper::Document
  many :comments
end

class Comment
  include MongoMapper::Document
  belongs_to :user
end

user = User.create!
user.comments.create!
user.destroy

我希望 user.destroy 也能级联到评论——或者至少能够配置它这样做。有什么想法吗？

Answer 1

为此，您需要使用嵌入式文档:

class User
  include MongoMapper::Document
  many :comments
end

class Comment
  include MongoMapper::EmbeddedDocument
  belongs_to :user
end

user = User.create!
user.comments.create!
user.destroy

不过这也有一些缺点......