猫鼬模式引用和未定义类型"ObjectID" [英] Mongoose schema reference and undefined type 'ObjectID'

问题描述

我正在尝试在架构之间建立某种关系，而解决方案存在一些问题. 这是我的设备架构:

I'm trying to do some relations between my schemas and I have some problems with my solution. Here is my device schema:

var deviceSchema = schema({
    name : String,
    type : String,
    room: {type: mongoose.Types.ObjectId,  ref: 'Room'},
    users: [{type:mongoose.Types.ObjectId, ref: 'User'}]
});

这里是房间模式:

var roomSchema = schema({
    name : String,
    image : String,
    devices: [{type: mongoose.Types.ObjectId, ref: 'Device'}]
});

猫鼬抛出错误

TypeError:room处的未定义类型ObjectID您是否尝试过嵌套 模式?您只能使用引用或数组进行嵌套.

TypeError: Undefined type ObjectID at room Did you try nesting Schemas? You can only nest using refs or arrays.

如果我将room: {type: mongoose.Types.ObjectId, ref: 'Room'},更改为room: {type: Number, ref: 'Room'},，则一切正常.您能解释一下为什么会这样吗?

If I change room: {type: mongoose.Types.ObjectId, ref: 'Room'}, to room: {type: Number, ref: 'Room'}, everything works. Could you explain me why this is happening?

推荐答案

mongoose.Types.ObjectId是ObjectId构造函数，要在模式定义中使用的是mongoose.Schema.Types.ObjectId(或mongoose.Schema.ObjectId).

mongoose.Types.ObjectId is the ObjectId constructor function, what you want to use in schema definitions is mongoose.Schema.Types.ObjectId (or mongoose.Schema.ObjectId).

所以deviceSchema应该看起来像这样:

So deviceSchema should look like this instead:

var deviceSchema = schema({
    name : String,
    type : String,
    room: {type: mongoose.Schema.Types.ObjectId,  ref: 'Room'},
    users: [{type:mongoose.Schema.Types.ObjectId, ref: 'User'}]
});

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