Question

我正在尝试设计数据库模型，但是我不知道如何将array的{{1}}和strings的{{1}}放入其中。我当前的模型是：

array

objects数据结构为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的示例数据结构为：

['234', '564', '213', '782']

如何将其作为配置添加到cart模型中？

Answer 1

收藏夹必须是这样的String数组：favorites: [String]

对于购物车数组，我们有两个主要选择：

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 }
    }
  }
});

或者我们可以将cart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 }
    }
  }
});

对于这两个文件，当您创建文档时，它看起来都是这样，请注意，猫鼬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"
}

如果您不希望购物车数组中有_id个字段，则可以添加_id: false选项，如下所示：

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

以下是一些有用的文档：

Arrays

Subdocuments

猫鼬模型，字符串数组，对象结构数组

1 个答案: