Node.js 值“的转换为数字失败”；“南”；（类型编号）位于计算字段Mongoose上的路径

在我的模式中，我添加了3个非必需参数

ratings

和

totalRating

，用于自动计算

平均值。更新现有记录时，一切正常，但单个参数记录创建失败，出现
Product。创建错误：错误：产品验证失败：平均化：路径“平均化”
处的值“NaN”（类型编号）转换为数字失败。
我试图在请求正文中添加
ratings
和
totalRating
，并将它们的默认值设置为0，但没有任何帮助。还是会出错。你知道为什么吗

模式：


const mongoose = require('mongoose');

const productSchema = new mongoose.Schema({
    createdOnDate: { type: Number, required: true },
    name: { type: String, required: true },
    brand: { type: String, required: true },
    price: { type: Number, required: true },
    description: { type: String, required: true },
    category: { type: String, required: true },
    city: { type: String, required: true },
    region: { type: String, required: true },
    country: { type: String, required: true },
    vendor: { type: String, required: true },
    barcode: { type: String, required: true },
    imageUrl: { type: String, required: true },
    fullImages: { type: Array, required: true },
    thumbNails: { type: Array, required: true },
    // productImage: Uint8Array,
    minimumStock: { type: Number, required: true },
    availableQuantity: { type: Number, required: true },
    soldQuantity: { type: Number, required: true },
    totalRating: { type: Number, required: false, default: 0 },
    ratings: { type: Number, required: false, default: 0 },
    averageRating: {
        type: Number, required: false, default: function () {
            return (this.totalRating / this.ratings)
        }
    },

},
    { timestamps: true });

module.exports = mongoose.model('Product', productSchema, 'Products');


已发送json:

Mongoos createProduct req.body:  {
  name: 'someName',
  quantity: 5,
  price: 5.5,
  city: 'Bologna',
  region: 'Emilia-Romagna',
  country: 'Italy',
  category: 'bikes',
  vendor: 'zazza zenigata',
  createdOnDate: 132468754,
  availableQuantity: 5,
  soldQuantity: 0,
  minimumStock: 10,
  imageUrl: 'someUrl',
  barcode: 'someCode',
  description: 'someDescription',
  brand: 'someBrand',
  totalRating: 0,
  ratings: 0
}



错误：

Product.create error: Error: Product validation failed: averageRating: Cast to Number failed for value "NaN" (type number) at path "averageRating"
    at ValidationError.inspect (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/error/validation.js:47:26)
    at formatValue (node:internal/util/inspect:757:19)
    at inspect (node:internal/util/inspect:336:10)
    at formatWithOptionsInternal (node:internal/util/inspect:1999:40)
    at formatWithOptions (node:internal/util/inspect:1881:10)
    at console.value (node:internal/console/constructor:327:14)
    at console.log (node:internal/console/constructor:363:61)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/api/src/controllers/product.controller.js:79:17
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4892:21
    at _done (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3118:16)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3133:18
    at callbackWrapper (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3087:20)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4868:18
    at processTicksAndRejections (node:internal/process/task_queues:76:11) {
  errors: {
    averageRating: CastError: Cast to Number failed for value "NaN" (type number) at path "averageRating"
        at SchemaNumber.cast (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schema/number.js:373:11)
        at SchemaNumber.SchemaType.applySetters (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schematype.js:1106:12)
        at SchemaNumber.SchemaType.getDefault (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schematype.js:1052:25)
        at $__applyDefaults (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/document.js:437:24)
        at model.Document (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/document.js:165:5)
        at model.Model (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:105:12)
        at new model (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4706:15)
        at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3094:22
        at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3130:7
        at Array.forEach (<anonymous>)
        at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3129:15
        at promiseOrCallback (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:9:12)
        at Mongoose._promiseOrCallback (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/index.js:1149:10)
        at Function.create (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3064:23)
        at exports.createProduct (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/api/src/controllers/product.controller.js:42:11)
        at handleReturn (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express-promise-router/lib/express-promise-router.js:24:23) {
      stringValue: '"NaN"',
      messageFormat: undefined,
      kind: 'Number',
      value: NaN,
      path: 'averageRating',
      reason: AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:
      
        assert.ok(!isNaN(val))
      
          at castNumber (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/cast/number.js:28:10)
          at SchemaNumber.cast (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schema/number.js:371:12)
          at SchemaNumber.SchemaType.applySetters (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schematype.js:1106:12)
          at SchemaNumber.SchemaType.getDefault (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/schematype.js:1052:25)
          at $__applyDefaults (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/document.js:437:24)
          at model.Document (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/document.js:165:5)
          at model.Model (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:105:12)
          at new model (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4706:15)
          at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3094:22
          at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3130:7
          at Array.forEach (<anonymous>)
          at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3129:15
          at promiseOrCallback (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:9:12)
          at Mongoose._promiseOrCallback (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/index.js:1149:10)
          at Function.create (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3064:23)
          at exports.createProduct (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/api/src/controllers/product.controller.js:42:11) {
        generatedMessage: true,
        code: 'ERR_ASSERTION',
        actual: false,
        expected: true,
        operator: '=='
      },
      valueType: 'number'
    }
  },
  _message: 'Product validation failed'
}
Product.create: undefined
/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:19
            throw error;
            ^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at new NodeError (node:internal/errors:329:5)
    at ServerResponse.setHeader (node:_http_outgoing:579:11)
    at ServerResponse.header (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express/lib/response.js:771:10)
    at ServerResponse.send (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express/lib/response.js:170:12)
    at ServerResponse.json (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express/lib/response.js:267:15)
    at ServerResponse.send (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express/lib/response.js:158:21)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/api/src/controllers/product.controller.js:85:23
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4892:21
    at _done (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3118:16)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3133:18
    at callbackWrapper (/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3087:20)
    at /Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4868:18
    at processTicksAndRejections (node:internal/process/task_queues:76:11) {
  code: 'ERR_HTTP_HEADERS_SENT'
}

Product.create错误：错误：产品验证失败：平均化：路径“平均化”处的值“NaN”（类型号）转换为数字失败
在ValidationError.inspect（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/error/validation.js:47:26）
at formatValue（节点：internal/util/inspect:757:19）
检查时（节点：内部/util/inspect:336:10）
at formatWithOptionsInternal（节点：internal/util/inspect:1999:40）
at formatWithOptions（节点：internal/util/inspect:1881:10）
at console.value（节点：内部/控制台/构造函数：327:14）
在console.log（节点：internal/console/constructor:363:61）
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/api/src/controllers/product.controller.js:79:17
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:16:11
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4892:21
完成时（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/model.js:3118:16）
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3133:18
在callbackWrapper（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/model.js:3087:20）
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4868:18
在处理和拒绝时（节点：内部/处理/任务队列：76:11）{
错误：{
averageRating:CastError:路径“averageRating”处的值“NaN”（类型编号）转换为数字失败
在SchemaNumber.cast（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/schema/number.js:373:11）
在SchemaNumber.SchemaType.applySetters（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/SchemaType.js:1106:12）
在SchemaNumber.SchemaType.getDefault（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/SchemaType.js:1052:25）
在$\uuuApplyDefaults（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/document.js:437:24）
位于model.Document（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/Document.js:165:5）
位于model.model（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/model.js:105:12）
在新模型中（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4706:15）
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3094:22
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3130:7
在Array.forEach（）处
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3129:15
promiseOrCallback（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/helpers/promiseOrCallback.js:9:12）
在Mongoose.\u promiseOrCallback（/Volumes/ProjectsSSD/FixitServer/FixitServer\u node/node\u modules/Mongoose/lib/index.js:1149:10）
在Function.create（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3064:23）
在exports.createProduct（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/api/src/controllers/product.controller.js:42:11）
在handleReturn（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/express promise router/lib/express promise router.js:24:23）{
stringValue:“‘NaN’”，
messageFormat:未定义，
种类：'编号'，
价值观：楠，
路径：'平均'，
原因：AssertionError[ERR_ASSERTION]：计算为错误值的表达式：
assert.ok（！isNaN（val））
在castNumber（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/cast/number.js:28:10）
在SchemaNumber.cast（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/schema/number.js:371:12）
在SchemaNumber.SchemaType.applySetters（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/SchemaType.js:1106:12）
在SchemaNumber.SchemaType.getDefault（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/SchemaType.js:1052:25）
在$\uuuApplyDefaults（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/document.js:437:24）
位于model.Document（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/Document.js:165:5）
位于model.model（/Volumes/ProjectsSSD/FixitServer/fixit\u server\u node/node\u modules/mongoose/lib/model.js:105:12）
在新模型中（/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:4706:15）
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3094:22
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3130:7
在Array.forEach（）处
at/Volumes/ProjectsSSD/FixitServer/fixit_server_node/node_modules/mongoose/lib/model.js:3129:15
在允诺或回购时（/Volumes/Proj）
productSchema.virtual("numberRatings").get(function() {
    return this.ratings.length;
});

productSchema.virtual("averageRating").get(function() {
    return this.ratings.length > 0 ? this.totalRating / this.ratings.length : 0;
});

const productSchema = new mongoose.Schema({
    createdOnDate: { type: Number, required: true },
    name: { type: String, required: true },
    brand: { type: String, required: true },
    price: { type: Number, required: true },
    description: { type: String, required: true },
    category: { type: String, required: true },
    city: { type: String, required: true },
    region: { type: String, required: true },
    country: { type: String, required: true },
    vendor: { type: String, required: true },
    barcode: { type: String, required: true },
    imageUrl: { type: String, required: true },
    fullImages: { type: Array, required: true },
    thumbNails: { type: Array, required: true },
    // productImage: Uint8Array,
    minimumStock: { type: Number, required: true },
    availableQuantity: { type: Number, required: true },
    soldQuantity: { type: Number, required: true, default: 0 },

    totalRating: { type: Number, required: false, default: 0 },
    ratings: { type: Number, required: false, default: 0 },

    // using .pre => doesn't update averageRating
    averageRating: { type: Number, required: false, default: 0 },
},
    {
        timestamps: true
    });

productSchema.pre('save', function (next) {
    // this.averageRating = this.totalRating > 0 ? this.totalRating / this.ratings : 0;
    this.averageRating = this.totalRating / this.ratings

    next();
});


const productSchema = new mongoose.Schema({
    createdOnDate: { type: Number, required: true },
    name: { type: String, required: true },
    brand: { type: String, required: true },
    price: { type: Number, required: true },
    description: { type: String, required: true },
    category: { type: String, required: true },
    city: { type: String, required: true },
    region: { type: String, required: true },
    country: { type: String, required: true },
    vendor: { type: String, required: true },
    barcode: { type: String, required: true },
    imageUrl: { type: String, required: true },
    fullImages: { type: Array, required: true },
    thumbNails: { type: Array, required: true },
    // productImage: Uint8Array,
    minimumStock: { type: Number, required: true },
    availableQuantity: { type: Number, required: true },
    soldQuantity: { type: Number, required: true, default: 0 },

    totalRating: { type: Number, required: false, default: 0 },
    ratings: { type: Number, required: false, default: 0 },

    // using .pre doesn't update
    // averageRating: { type: Number, required: false, default: 0 },

},
    {
        timestamps: true,
        toObject: { virtuals: true },
        toJSON: { virtuals: true }
    });

productSchema.virtual("averageRating").get(function () {
    return this.totalRating > 0 ? this.totalRating / this.ratings : 0;
});