Mongoid查找嵌入式文档 [英] Mongoid find embedded document

问题描述

我正在尝试通过其ID搜索嵌入式文档，然后将其返回.据我所知，这可能是可行的，但是只能通过使用mongo查找嵌入该文档的文档，然后在ruby中搜索该文档来寻找我想要的嵌入式文档.像这样:

I'm trying to search for an embedded document by its id, and return it. This is possible, but only, as far as I see, by using mongo to find the document which embeds it, and then searching that document in ruby for the embedded document I'm after. Like this:

# commenter.rb
  def post
    # todo: find syntax do avoid double query
    if user = User.any_of({'posts.commenter_ids' => self.id}).last
      user.posts.where('commenter_ids' => self.id).last
    end
  end

看起来很简单，但是我没有在Google/SO搜索中找到我喜欢的东西.

Seems simple, but I haven't found anything I like obviously on google/SO search.

有想法吗?

推荐答案

class Order
  embeds_many Products
end

class Product
  embedded_in Order
end

prod_id = "1234" # the embedded doc's _id you request
o = Order.find(product_ids: prod_id)
p = o.products.find(prod_id)

另请参见是否查询Mongoid加载父文档后，嵌入式文档将命中数据库服务器

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