关于如何排列 mongodb 文档的建议
我正在使用 Codeigniter 和 MongoDB 构建 API。 我有一些关于如何“建模” mongoDB 的问题。
用户应该拥有姓名等基本数据，并且用户还应该能够 关注其他用户。就像现在每个用户文档都跟踪所有人 那正在跟随他以及他所跟随的一切。这是通过使用数组来完成的 用户_ids。
就像这样：
"following": [323424,2323123,2312312],
"followers": [355656,5656565,5656234234,23424243,234246456],
"fullname": "James Bond"
这是一个好方法吗？也许用户文档应该只包含用户正在关注的人的 ID，而不包含正在关注他的人？我可以想象，在数组中保留潜在的数千个 ID（对于关注者）会使文档变得很大？
欢迎所有意见！
I am building an API using Codeigniter and MongoDB.
I got some questions about how to "model" the mongoDB.
A user should have basic data like name and user should also be able to
follow other users. Like it is now each user document keeps track of all people
that is following him and all that he is following. This is done by using arrays
of user _ids.
Like this:
"following": [323424,2323123,2312312],
"followers": [355656,5656565,5656234234,23424243,234246456],
"fullname": "James Bond"
Is this a good way? Perhaps the user document should only contain ids of peoples that the user is following and not who is following him? I can imaging that keeping potentially thousands of ids (for followers) in an array will make the document to big?
All input is welcome!
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最大文档大小目前限制为 16MB（v1.8.x 及更高版本），这相当大了。但我仍然认为，在这种情况下，将关注者关系转移到自己的集合中是可以的——你永远不知道你的项目有多大。
但是：我建议使用数据库引用来存储关注者关系：从数据库引用解析用户会更容易。看一下：
http://www.mongodb.org/display/DOCS/Database+参考文献
The max-document size is currently limited to 16MB (v1.8.x and up), this is pretty big. But i still think, that it would be ok in this case to move the follower-relations to an own collection -- you never know how big your project gets.
However: i would recommend using database references for storing the follower-relations: it's way easier to resolve the user from a database reference. Have a look at:
http://www.mongodb.org/display/DOCS/Database+References