模式中的递归元素:猫鼬建模 [英] Recursive elements in Schema : Mongoose modelling

问题描述

有什么想法如何在猫鼬模式中对Tree文档进行建模?

Any idea how to model a Tree document in Mongoose Schema?

var TreeSchema = new Schema({
    "Non-leafNode": {
        "children": [
            {
                "type": "NodeElement"
            }
        ]
    },
    "NodeElement": {
        // one of them is required. not both.
        "elem": {
            "type": "LeafNode"
        },
        "elem2": {
            "type": "Non-leafNode"
        }
    },
    "LeafNode": {}
});

一个人该如何建模?整个树是一个文档(理想情况下).

How could one model this? The entire Tree is one document (ideally).

推荐答案

来自 https://groups.google.com/forum/#!topic/mongoose-orm/0yUVXNyprx8 :

通过设计，它可能会起作用.没有为此的测试.为此，我有Schema#add来产生递归引用:

By design, it might work. There's no tests for this. I have Schema#add in there for this purpose, to produce recursive references:

var Tasks = new Schema();
Tasks.add({
   title     : String
 , subtasks  : [Tasks]
});

因此，您需要逐步构建递归.

So you need to construct the recursion step by step.

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