node.js - 用于多项选择题和答案的 MongoDB 模式设计

Question

我不擅长 MongoDB 设计，我在设计数据库方面需要帮助。存储有答案选择的问题和候选人的答案的最佳结构是什么？

-每位考生将获得一组 12 个问题，如果考生在第一次考试中失败，他们可以再参加 2 次考试。因此，在每次考试中，考生每次都应该得到不同的问题集。

-由于每个问题集为 12，因此必须记录每个考生对每个测试的答案，分数为 12 分。

Answer 1

我为每个必需的详细信息创建了一个 mongoose 模式。你可以从中得到帮助。我已经分析了一些您的要求并为许多模式添加了模型，第一个问题模式，导出为模型

import { Schema } from 'mongoose';
import { AnswerOptionSchema } from './answer-option-schema';
const mongoose = require('mongoose');

export const QuestionSchema: Schema = new Schema({
  question: {
    type: String,
    minlength: 10,
    maxlength: 1000,
  },
  answerOptions: {
    type: [AnswerOptionSchema],
    default: undefined,
    validate: {
      validator: function(value: any) {
        return value && value.length === 4;
      },
      message: 'Answer options should be 4.'
    }
  }
}, {
  timestamps: true
});

export const Question = mongoose.model('Question', QuestionSchema);

在 QuestionSchema 中，我嵌入了一个 AnswerOptionSchema 作为

import { Schema } from 'mongoose';

export const AnswerOptionSchema: Schema = new Schema({
  optionNumber: {
    type: Number
  },
  answerBody: {
    type: String,
    minlength: 1,
    maxlength: 200,
  },
  isCorrectAnswer: { // you can store the correct answer with question id in another model.
    type: Boolean,
    default: false
  }
}, {
  _id: false
});

在这些模式的帮助下，我创建了一个 QuestionSetSchema 来添加一组问题模式作为

import { Schema } from "mongoose";
import { QuestionSchema } from "./question-schema";
const mongoose = require('mongoose');

export const QuestionSetSchema: Schema = new Schema({
  questionSet: {
    type: [QuestionSchema],
    validate: {
      validator: function(value: any) {
        return value.length === 12;
      },
      message: 'Question set must be 12.'
    }
  },
}, {
  timestamps: true
});

export const QuestionSet = mongoose.model('QuestionSet', QuestionSetSchema);

现在准备好了问题、答案选项和集合，现在需要设计候选模式，

import { Schema } from "mongoose";
const mongoose = require('mongoose');

export const CandidateSchema: Schema = new Schema({
  name: String,
  email: String, // you can store other candidate related information here.
  totalAttempt: {
    type: Number,
    default: 0,
    validate: {
      validator: function(value: number) {
        return value === 3;
      },
      message: 'You have already done three attempts.'
    }
  },
  candidateQuestionAnswers: {
    type: [Schema.Types.ObjectId],
    ref: 'CandidateQuesAnswer'
  }
}, {
  timestamps: true
});

export const Candidate = mongoose.model('Candidate', CandidateSchema);

在这里，您会注意到，我还在计算候选人的总尝试次数以及他在 CandidateQuesAnswer 模型中给出的每组答案。该模型的结构如下

import { Schema } from "mongoose";

export const CandidateQuesAnswerSchema = new Schema({
  candidate: {
    type: Schema.Types.ObjectId,
    ref: 'Candidate'
  },
  questionSet: {
    type: Schema.Types.ObjectId,
    ref: 'QuestionSet'
  },
  questionAnswers: {
    type: [Number] // You can add answer schema
  },
  totalScore: {
    type: Number
  },
  isPassed: {
    type: Boolean,
    default: false
  }
}, {
  timestamps: true
});

CandidateQuesAnswerSchema.pre('save', function updateTotalScore(next) {
  // update total score of the candidate here based on the correct questionAnswers and
  // questionSet.
  next();
});

CandidateQuesAnswerSchema.pre('save', function updateIsPassed(next) {
  // update the isPassed based on the totalScore obtained by the candidate.
  next();
});

export const CandidateQuesAnswer = mongoose.model('CandidateAnswer', CandidateQuesAnswerSchema);

在保存文档和计算值以声明候选通过或失败之前，我使用了 mongoose 提供的预 save Hook 。