Mongoose：Coffeescript中的递归嵌入文档

问题描述

根据（其工作原理）：

  var Comment = new Schema（）; 
 
 Comment.add（{
 title：{type：String，index：true} 
，date：Date 
，body：String 
，comments ：[Comment] 
}）; 
  

我想创建一个CoffeeScript版本

  mongoose = require'mongoose'
 Schema = mongoose.Schema 
 
 Person = new Schema 
 Person.add 
 mother： Person 
 father：Person 
  

但是它返回一个错误， / p>

  TypeError：undefined不是函数
在CALL_NON_FUNCTION_AS_CONSTRUCTOR（native）
 Function.interpretAsType /node_modules/mongoose/lib/schema.js:202:10）
在Schema.path（/path/node_modules/mongoose/lib/schema.js:162:29）
在Schema.add /path/node_modules/mongoose/lib/schema.js:110:12）
 at Object。< anonymous> （/path/Models/test.coffee:6:10）
 at Object。< anonymous> （/path/Models/test.coffee:10:4）
在Module._compile（module.js：411：26）
在Object.run（/ usr / local / lib / node_modules / coffee -script / lib / coffee-script.js：57：25）
在/usr/local/lib/node_modules/coffee-script/lib/command.js:147:29 
在/ usr / local / lib / node_modules / coffee-script / lib / command.js：115：26 
  

解决方案

嵌入的文档只能作为数组中的项存在。这是根据设计，您可以询问的原因：）

您可能想使用 DBRef ：

  Person = new Schema 
 mother：{type：Schema.ObjectId，ref：'Person'} 
 father：{type：Schema.ObjectId，ref：'Person'} 
  pre> 
 
 
（注意您不需要添加调用）
 
 
 
请参见。
 
Based on this example (which works):
var Comment = new Schema();

Comment.add({
    title : { type: String, index: true }
  , date : Date
  , body : String
  , comments : [Comment]
});
I wanted to create a CoffeeScript version
mongoose = require 'mongoose'
Schema = mongoose.Schema

Person = new Schema
Person.add
  mother: Person
  father: Person
However it returns an error and I don't understand why
TypeError: undefined is not a function
    at CALL_NON_FUNCTION_AS_CONSTRUCTOR (native)
    at Function.interpretAsType (/path/node_modules/mongoose/lib/schema.js:202:10)
    at Schema.path (/path/node_modules/mongoose/lib/schema.js:162:29)
    at Schema.add (/path/node_modules/mongoose/lib/schema.js:110:12)
    at Object.<anonymous> (/path/Models/test.coffee:6:10)
    at Object.<anonymous> (/path/Models/test.coffee:10:4)
    at Module._compile (module.js:411:26)
    at Object.run (/usr/local/lib/node_modules/coffee-script/lib/coffee-script.js:57:25)
    at /usr/local/lib/node_modules/coffee-script/lib/command.js:147:29
    at /usr/local/lib/node_modules/coffee-script/lib/command.js:115:26
EDIT: Okay, I found out that it doesn't work when Person isn't an array (in brackets), but why?
 解决方案 
Embedded documents can only exist as items in an array. That is by design, you can ask the authors for their reasons :)
You might want to use a DBRef:
Person = new Schema
  mother: { type: Schema.ObjectId, ref: 'Person' }
  father: { type: Schema.ObjectId, ref: 'Person' }
(notice you don't need the add call)
See the docs for populate/DBRef.
                        
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