Question

我正在播种数据库以进行测试，所以现在我要为每个要插入100门课程的讲师插入15000个讲师数据。所以我跑了循环首先获取所有教师ID，其次为该教师ID存储100门课程，但是在插入课程时出现这种错误

E11000 duplicate key error collection: Courser.courses index: ratings.user_1 dup key: { : null }

这是每个教师进入课程的代码

seedCourse: async (req, res, next) => {
    try {
        const instructors = await Instructor.find();
        //const insrtuctor contains 15000 instructor
        for(let oneInst of instructors) {
            for(let i=0; i<=100; i++) {
                const course = await new Course({
                    title: faker.lorem.sentence(),
                    description: faker.lorem.paragraph(),
                    author: oneInst._id,
                    prise: Math.floor(Math.random()*6 + 4),
                    isPublished: 'true',
                    tags: ["java", "Nodejs", "javascript"]
                });
            const result = await course.save();
            await Instructor.findByIdAndUpdate(oneInst._id, { $push: { courses: result._id } });
            console.log(`Instructor Id ${oneInst._id} Course added ${i}`);
        }             
    } 
    } catch (error) {
        next(error)
    }
}

我的课程模型定义看起来像这样

const mongoose = require('mongoose');

const Course = mongoose.model('courses', new mongoose.Schema({

title: {
    type: String,
    required: true,
    minlength: 3
},
author: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'instructor'
},
description: {
    type: String,
    required: true,
    minlength: 5
},
ratings: [{
    user: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'users',
        required: true,
        unique: true
    },
    rating: {
        type: Number,
        required: true,
        min: 0,
        max: 5
    },
    description: {
        type: String,
        required: true,
        minlength: 5
    }
}],
tags: [String],
rating: {
    type: Number,
    min: 0,
    default: 0
},
ratedBy: {
    type: Number,
    min: 0,
    default: 0
},
prise: {
    type: Number,
    required: function() { this.isPublished },
    min: 0
},
isPublished: {
    type: Boolean,
    default: false
}
}));

module.exports = Course;

Answer 1

在user数组中的课程模式ratings中，是一个唯一字段。在DB中存储课程时，您没有给出任何唯一的值。第一次将工具值设置为null，但是下次尝试为用户保存null值。因此违反了架构。删除unique:true或为用户传递唯一值

E11000重复键错误集合：在mongodb中插入文档

1 个答案: