猫鼬填充新实例

问题描述

我将Node and Express与Mongoose结合使用，并且试图在其中填充'product'属性

const item = new CartItem({ _pId: id,product: id });

所以我想做的基本上是这样，但它不起作用

   const item = new CartItem({ _pId: id,product: id });

    item.populate({
      path: 'cart.products.product',model: 'Product',select: '-inStock -_userId -__v',});

    this.markModified('cart.products');

    this.cart.products.push(item);
    return this.save();

我也不确定这部分是否是“ this.markModified（'cart.products'）;”是必需的。

这是整个方法

schema.methods.addUpdateRemoveCartItem = function (id,newQuantity) {
  let productsIndex;

  const productIsInCart = this.cart.products.some((el) => {
    productsIndex = this.cart.products.indexOf(el);
    return el._pId._id.equals(id);
  });

  if (productIsInCart) {
    if (newQuantity > 0) {
      this.cart.products[productsIndex].qty = +newQuantity;
    } else if (newQuantity == 0) {
      this.cart.products.splice(productsIndex,1);
    } else {
      this.cart.products[productsIndex].qty += 1;
    }

    this.markModified('cart.products');
  } else {
    /* doesnt populate */
    const item = new CartItem({ _pId: id,});

    this.markModified('cart.products');

    this.cart.products.push(item);
    return this.save();
  }

这是模型

const mongoose = require('mongoose');
const CartItem = require('../models/cart.model');
const Product = require('../models/product.model');

const schema = new mongoose.Schema(
  {
    name: {
      type: String,trim: true,required: true,maxLength: 30,minlength: 2,},email: {
      type: String,cart: {
      products: { type: Array,of: CartItem },totalQuantity: { type: Number,min: 0,default: 0 },totalPrice: { type: Number,{
    toJSON: { virtuals: true },toObject: { virtuals: true },}
);

schema.methods.addUpdateRemoveCartItem = function (id,newQuantity) {// specified above}

const User = mongoose.model('User',schema);

module.exports = User;

const mongoose = require('mongoose');

const schema = new mongoose.Schema({
  _id: false,_pId: {
    type: mongoose.Schema.Types.ObjectId,ref: 'Product',product: {
    type: mongoose.Schema.Types.ObjectId,qty: {
    type: Number,max: 10000,default: 1,});

const Cart = mongoose.model('Cart',schema);

module.exports = Cart;

解决方法

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