Mongodb mongoose节点js架构关系

Question

你好，我是 mongodb 和 node js 的新手，我有一个问题

这是我的产品架构

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const categorySchema = require('./category');

const ProductSchema = new Schema({
    country: {
        type: String,
        required: [true, "country can't be null"]
    },
    city: {
        type: String,
        default: ""
    },
    name: {
        type: String,
        required: [true, "name can't be null"]
    },
    measureValue: {
        type: Number,
        default: 0
    },
    minPrice: {
        type:Number,
        required: [true, "minPrice can't be null"],
        min: [1,"minPrice must be at least 1"]
    },
    maxPrice: {
        type:Number,
        required: [true, "maxPrice can't be null"],
        min: [1,"maxPrice must be at least 1"]
    },
    photoUrl: {
        type:String,
        default: ""
    },
    explanation: {
        type: String,
        default: ""
    },
    category: [categorySchema.schema],
    userID: {
        type: String,
        required: [true,"userid cant be null"]
    },
    isActive: {
        type: Boolean,
        default: true
    },
    createdDate: {
        type: Date,
        default: Date.now
    },
    deletedDate: {
        type:Date
    }
})

这是我的类别架构

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const CategorySchema = new Schema({
 name: {
        type: String,
        required: [true, "name can't be null"]
    },
    createdDate: {
        type: Date,
        default: Date.now
    },
    deletedDate: {
        type:Date
    }
})

我需要这样做； 每个产品数据都必须有类别

如果有一天，一个类别的名称发生了变化，那么与该类别相关的每个产品都必须更改

我正在尝试将类别 id 设置为产品架构，当我获取数据时，它必须是每个类别名称为 json 的产品

如果你帮助我，我真的很困惑，我真的很感激

Answer 1

您可以将类别设置为：

category: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'category' //your model name
    }

如果需要多个类别，可以将其包装到一个数组中并命名为类别。

然后，当您获取数据时，您将必须执行new Product().populate('category')来检索类别数据，而不仅仅是返回类别 ObjectId。