Question

这一实例似乎都使用过(included),以使某一类别成为一种持久性模式,但不清楚何时我应使用一种或另一种模式。

Answer 1

www.un.org/chinese/ga/president http://www.ohchr.org。例如,我要说的是,我有博客申请。缩略语他们可以这样看待:

require  mongo_mapper 
MongoMapper.database =  test 

class Post
  include MongoMapper::Document

  key :title
  key :body
  key :comments

  many :comments
end

class Comment
  include MongoMapper::EmbeddedDocument

  key :author
  key :body
end

p = Post.new(:title =>  Some post , :body =>  About something )
p.comments << Comment.new(:author =>  Emily , :body =>  A comment )

p.save

puts Post.all.map(&:inspect)

将在贵族数据库中编制一份文件,其中研究:

{ "_id" : ObjectId("4c4dcf4b712337464e000001"),
  "title" : "Some post",
  "body" : "About something",
  "comments" : [
        {
                "body" : "A comment",
                "author" : "Emily",
                "_id" : ObjectId("4c4dcf4b712337464e000002")
        }
] }

就通过MongoMapper与他们互动而言,只有MongoMapper:Document对find和save等方法的答复。缩略语只能通过上级文件查阅。其含义是,你只应使用<代码>MongoMapper:EmbeddedDocument,用于明显与其母体模型相配套的模型,而且只能用于母体。

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