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我一直在从他们的网站上托管的在线Webinar学习MongoDB,并且我试图将产品链接到一个类别(例如,iPhone属于具有诸如电子的祖先的类别移动设备),但是在嵌套我收到以下错误:嵌套MongoDB架构
MongooseError: Schema hasn't been registered for model "Category".
Use mongoose.model(name, schema)
我看见几个问题,通过编写Schema.ObjectId和Schema.Types.ObjectId,但我得到Cast Error to ObjectId
上发射插入(保存)查询。
有与这些几个问题:
- 如何确保,同时加入了产品,我也添加它挂类别?
- 对于这种情况(添加子文档或引用模式),最佳做法是什么?
PFB型的文件,我已经以执行CRUD操作写在最重要的是控制文件:
category.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var categorySchema = new Schema({
_id: { type: String },
parent: {
type: String,
ref: 'Category'
},
ancestors: [{
type: String,
ref: 'Category'
}]
});
module.exports.categorySchema = categorySchema;
products.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var Category = require('./category');
var fx = require('./fx');
var productSchema = new mongoose.Schema({
name: { type: String, required: true },
// Pictures must start with "http://"
pictures: [{ type: String, match: /^http:\/\//i }],
price: {
amount: {
type: Number,
required: true,
set: function(v) {
this.internal.approximatePriceUSD =
v/(fx()[this.price.currency] || 1);
return v;
}
},
// Only 3 supported currencies for now
currency: {
type: String,
enum: ['USD', 'EUR', 'GBP'],
required: true,
set: function(v) {
this.internal.approximatePriceUSD =
this.price.amount/(fx()[v] || 1);
return v;
}
}
},
category: { type: Schema.ObjectId,ref: 'Category'},
internal: {
approximatePriceUSD: Number
}
});
//var schema = new mongoose.Schema(productSchema);
var currencySymbols = {
'USD': '$',
'EUR': '€',
'GBP': '£'
};
/*
* Human-readable string form of price - "$25" rather
* than "25 USD"
*/
productSchema.virtual('displayPrice').get(function() {
return currencySymbols[this.price.currency] +
'' + this.price.amount;
});
productSchema.set('toObject', { virtuals: true });
productSchema.set('toJSON', { virtuals: true });
module.exports = mongoose.model("Product", productSchema);
示例P输出结构RODUCT:
{
"_id": "**autogeneratedByMongo",
"name":"iPhone",
"category":{
"_id":"Mobiles",
"ancestors":["Electronics","Mobiles"]
}
....
}
但是当我添加mongoose.Schema.Types.ObjectId,我尝试以下列方式插入数据: { \t “名”: “LG G4”, \t “照片”:“HTTP://谷歌”, \t “价格”:{ \t \t “量”:300, \t \t “货币”: “USD” \t}, \t “类别”: “笔记本电脑” }我得到铸造错误到的ObjectId 。我将在此阅读关于填充的内容。 – Hardik
这样做: - category:'{type:mongoose.Schema.Types.ObjectId,ref:'category'}'不要输入_id mannualy,因为mongodb会自动提供_id给数据库,数据库(随机ObjectId) – hardy
,但我仍然收到消息:'铸造ObjectID失败的价值'错误。 – Hardik