Javascript 我的静态方法没有运行

这是我的

recipe.js

文件

const express = require('express');
const mongoose = require('mongoose');
const User = require('../model/user');
require('mongoose-currency').loadType(mongoose);
const Currency = mongoose.Types.Currency;
const Schema = mongoose.Schema;
const reviewSchema = require('../model/review');



let recipeSchema = new Schema({

  name: {
    type: String,
    required: true
  },

  description: {
    type: String,
  },

  steps: {
    type: String,
    required: true,
  },

  ingredients: {
    type: Array,
    default: ['1', '2', '3', '4']
  },

  category: {
    type: String,
    required: true,
    index: true
  },

  postedBy: {
    type: String,
    required: true,
  },


  reviewsOfRecipe: [reviewSchema],

  numberOfRatings: {
    type: Number,
    default: 0
  },

  totalAddedRatings: {
      type: Number,
      default: 0
  },

  reviewAverage: {
      type: Number,
      default: 0
  },

  postersCreationDate: {
    type: Number,
    index: true
  },

  likedBy: {
      type: Array

  },

  reviewedBy: {
      type: Array
  }


});

// Here is my static method

recipeSchema.methods.calculateAverage = function(){

  let recipe = this;

  if (recipe.numberOfRatings === 0  && recipe.totalAddedRatings === 0){
    recipe.reviewAverage = 0;
  }
  else {


    recipe.reviewAverage = recipe.totalAddedRatings / recipe.numberOfRatings


  }


};



let Recipe = mongoose.model('Recipe', recipeSchema);

module.exports = Recipe;

在我的路由器文件中，每次用户提交配方审核时，

numberOfRatings

和

totalAddedRatings

字段都会增加。在它们增加之后，我的静态方法

calculateAverage

应该运行并更新文档

以下是我的代码中的内容：

Recipe.findOneAndUpdate({_id: recipe._id, postersCreationDate: recipe.postersCreationDate},{$inc: {numberOfRatings: 1, totalAddedRatings: reviewScore}}, {returnNewDocument: true}).then((recipe) => {

               recipe.calculateAverage();
});

但是，每次用户提交评论时，尽管

numberOfRatings

和

numberOfRatings

会相应增加，但

reviewAverage

不会增加

---

我正在考虑将

reviewAverage

设置为一个虚拟字段；但我担心这样做会使按照最高和最低审查平均数对食谱进行排序变得更加困难和低效

首先，关于您的FindOn和DupDate的一些事情可能会发生变化。Id应足以查找，并且“returnNewDocument”不是选项。在猫鼬中，它只是“新的”

Recipe.findOneAndUpdate({_id: recipe._id},{$inc: {numberOfRatings: 1, totalAddedRatings: reviewScore}}, {new: true}).then((recipe) => {
    recipe.calculateAverage();
});

问题是你没有将平均值保存到配方中

recipeSchema.methods.calculateAverage = function(callback) {
  let recipe = this;
  if (recipe.numberOfRatings === 0  && recipe.totalAddedRatings === 0) {
      recipe.reviewAverage = 0;
  }
  else {
      recipe.reviewAverage = recipe.totalAddedRatings / recipe.numberOfRatings
  }
  recipe.save(callback);
};

---

我正在修补它，它总是假设

numberOfRatings

和

totalAddedRatings

都是零，尽管是递增的，所以我得到的“reviewAverage”仍然是零。事实证明，预保存挂钩不会在findOneAndUpdate（）上执行。我将更改我的答案