猫鼬模型，字符串数组，对象数组结构

Question

我正在尝试设计我的数据库模型，但我不知道如何将 array 的 strings 和 array 的 objects 放入其中。我目前的模型是：

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

const schema = new Schema({
    email: { type: String, unique: true, required: true },
    hash: { type: String, required: true },
    createdDate: { type: Date, default: Date.now },
    settings: {
        favorites: { /* ??? */ },
        cart: { /* ??? */ },
        states: {
            favorites: { type: Boolean, default: true },
            search: { type: Boolean, default: false },
            category: { type: Schema.Types.Mixed, default: false }
        }
    }
});

schema.set("toJSON", { virtuals: true });

module.exports = mongoose.model("User", schema);

favorites数据结构为['234', '564', '213', '782']

cart示例数据结构为：

[
    { quantity: 5, marketId: '234' },
    { quantity: 2, marketId: '564' },
    { quantity: 7, marketId: '213' },
    { quantity: 3, marketId: '782' }
]

如何将此作为配置添加到mongoose 模型？

Answer 1

Favorites 必须是这样的字符串数组：favorites: [String]

对于购物车数组，我们有两个主要选项：

1. 我们可以将购物车定义为subdocuments 的数组。

const schema = new Schema({
  email: { type: String, unique: true, required: true },
  hash: { type: String, required: true },
  createdDate: { type: Date, default: Date.now },
  settings: {
    favorites: [String],
    cart: [
      {
        quantity: Number,
        marketId: String
      }
    ],
    states: {
      favorites: { type: Boolean, default: true },
      search: { type: Boolean, default: false },
      category: { type: Schema.Types.Mixed, default: false }
    }
  }
});

1. 或者我们可以将购物车声明为schema types 的数组。

const schema = new Schema({
  email: { type: String, unique: true, required: true },
  hash: { type: String, required: true },
  createdDate: { type: Date, default: Date.now },
  settings: {
    favorites: [String],
    cart: [
      new Schema({
        quantity: Number,
        marketId: String
      })
    ],
    states: {
      favorites: { type: Boolean, default: true },
      search: { type: Boolean, default: false },
      category: { type: Schema.Types.Mixed, default: false }
    }
  }
});

对于他们两个，当你创建一个文档时，它会是这样的，注意mongoose在卡片项目中添加了_id字段。

{
    "settings": {
        "states": {
            "favorites": true,
            "search": false,
            "category": false
        },
        "favorites": [
            "234",
            "564",
            "213",
            "782"
        ],
        "cart": [
            {
                "_id": "5e6cd0bd53feb32d50699b79",
                "quantity": 5,
                "marketId": "234"
            },
            {
                "_id": "5e6cd0bd53feb32d50699b78",
                "quantity": 2,
                "marketId": "564"
            },
            {
                "_id": "5e6cd0bd53feb32d50699b77",
                "quantity": 7,
                "marketId": "213"
            },
            {
                "_id": "5e6cd0bd53feb32d50699b76",
                "quantity": 3,
                "marketId": "782"
            }
        ]
    },
    "_id": "5e6cd0bd53feb32d50699b75",
    "email": "abc@def.net",
    "hash": "hash...",
    "createdDate": "2020-03-14T12:40:29.969Z",
    "__v": 0,
    "id": "5e6cd0bd53feb32d50699b75"
}

如果您不想在购物车数组中添加 _id 字段，您可以在购物车架构中添加 _id: false 选项，如下所示：

    cart: [
      new Schema(
        {
          quantity: Number,
          marketId: String
        },
        { _id: false }
      )
    ],

这里有一些有用的文档：

Arrays

Subdocuments