如何定义猫鼬模式中对象数组的最小长度？

Posted 2023-03-10

【中文标题】如何定义猫鼬模式中对象数组的最小长度？

【英文标题】：How to define the minimum length of array of objects in mongoose schema?

【发布时间】：2021-06-23 00:02:26

【问题描述】：

我有我的问题Model.js 本身

const mongoose = require('mongoose');
const validator = require('validator');

const questionSchema = new mongoose.Schema(
  question: 
      type: String,
      required: [true, 'Question Required'],
      trim: true
  ,
  options: [  // this array should atleast have two objects meaning two options
    
        optionNo: Number,
        optionValue:
            type: String,
            required: [true,'Option required'],
            trim: true
        
    ,
  ]
);

const Question = mongoose.model('Question', questionSchema);
module.exports = Question;

我希望每个问题至少有两个选项，如何在上面的“选项”字段中实现这一点。

【参考方案1】：

解决方案 1

const questionSchema = new mongoose.Schema(
  question: 
      type: String,
      required: [true, 'Question Required'],
      trim: true
  ,
  options: 
    type: [
        optionNo: Number,
        optionValue:
            type: String,
            required: [true,'Option required'],
            trim: true
        
    ],
    validate: [(val) -> val.length > 1, 'Must have minimum two options']
  
);

解决方案 2

questionSchema.path('options')
    .validate((val) -> val.length > 1, 'Must have minimum two options');

参考

SchemaType.prototype.validate()

Array size in Mongoose schema