猫鼬方法不是函数

Question

我正在使用猫鼬，每次我尝试使用我为模式创建的方法时，它都会抛出以下错误消息：

UnhandledPromiseRejectionWarning: TypeError: findItem.updatePrice is not a function

模型定义和实例创建：

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/shopApp')
.then(()=>{
    console.log('Working!');
})
.catch(err=>{
    console.log('Error');
    console.log(err);
})

const productSchema = new mongoose.Schema({
 name: {
     type: String,
     required: true
 },
 price: {
     type: Number
 }
}) 
const product = mongoose.model('product', productSchema);
const bike = new product({name:'MTB', price: 599});

productSchema.methods.updatePrice = function(newprice){
    this.price = newprice;
    return this.save();
}

const updatedPrice = async ()=>{
    const findItem = await product.findOne({name:'MTB'});
    await findItem.updatePrice(500);
}
updatedPrice();

Answer 1

docs 中的示例在创建实例之前定义了实例方法。

productSchema.methods.updatePrice = function(newprice){
    this.price = newprice;
    return this.save();
}

const product = mongoose.model('product', productSchema);
const bike = new product({name:'MTB', price: 599});

猫鼬方法不是函数

Mongose method is not a function

javascript

methods

mongoose

mongodb

node.js