更改猫鼬模式视图模型答案

【问题标题】：Change mongoose schema viewModel更改猫鼬模式视图模型
【发布时间】：2017-09-23 01:33:38
【问题描述】：

我对 mongoose 中的相关架构有疑问：我有 3 个架构：

var recipeProductSchema = new mongoose.Schema({
    product: { type: mongoose.Schema.Types.ObjectId, ref: 'Product' },
    productWeight: Number
}, {toJSON: {virtuals: true}});

var recipeSchema = new mongoose.Schema({
    name: String,
    products: [RecipeProduct]
})

var productSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    weight: {
        type: Number,
        required: true
    },
    price: {
        type: Number,
        required: true
    }
})

当我想用我发送的产品创建配方时：

{
    "name": "Cake",
    "products": [
        {
            "product": "597a517b7c2e8508c8cc3f3a",
            "productWeight": 50
        }
    ]
}

但是当我得到有关食谱的详细信息时，我得到了这个：

{
    "_id": "597f7d0ce25d1413149aa30d",
    "name": "Cake",
    "products": [
        {
            "product": {
                "_id": "597a517b7c2e8508c8cc3f3a",
                "name": "Sugar",
                "weight": 400,
                "price": 40
            },
            "productWeight": 50,
            "_id": "597b825a61736b1adcb0ed0f",
            "productPrice": "5.00",
            "id": "597b825a61736b1adcb0ed0f"
        }
    ]
}

是否有可能使这两个json彼此相似？因为在编辑配方视图中我不想在发送数据之前更改配方的产品对象；

我想发送这个 json：

{
    "name": "Cake",
    "products": [
        {
            "product": {
                "id": "597a517b7c2e8508c8cc3f3a" // or "_id"
            },
            "productWeight": 50
        }
    ]
}

我想得到：

{
    "_id": "597f7d0ce25d1413149aa30d",
    "name": "Cake",
    "products": [
        {
            "product": {
                "_id": "597a517b7c2e8508c8cc3f3a",
                "name": "Sugar",
                "weight": 400,
                "price": 40
            },
            "productWeight": 50,
            "_id": "597f7d0ce25d1413149aa30e",
            "productPrice": "5.00",
            "id": "597f7d0ce25d1413149aa30e"
        }
    ]
}

【问题讨论】：

标签： node.js mongodb mongoose

【解决方案1】：

尝试建立子/父关系

var recipeProductSchema = new mongoose.Schema({
    product: [productSchema],
    productWeight: Number
}, {toJSON: {virtuals: true}});

var recipeSchema = new mongoose.Schema({
    name: String,
    products: [recipeProductSchema]
})

var productSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    weight: {
        type: Number,
        required: true
    },
    price: {
        type: Number,
        required: true
    }
})

并在您的创建函数中执行$push。

您也可以在 get 函数中使用 mongoose populate

【讨论】：