Mongo模式，具有唯一值的字符串数组 [英] Mongo schema, array of string with unique values

问题描述

我正在为mongo文档创建架构，除了防止在非对象数组中重复之外，我可以做所有事情.

I'm creating the schema for a mongo document and I can do everything except prevent duplicates in a non-object array.

我知道addToSet，但是我指的是Mongo Schema.

I'm aware of the addToSet, but I'm referring to Mongo Schema.

我不想使用$ addToSet来检查Update，而是希望它成为我的模式验证的一部分.

I don't want to check on Update using $addToSet, rather I want this to be part of my schema validation.

下面的例子.

let sampleSchema = {
   name: { type: 'String', unique: true },
   tags: [{ type: 'String', unique: true }]
}

以上代码段可防止名称重复值.它允许将标签存储为字符串数组.

The above snippet prevents name from having duplicate values. It allows tags to be stored as a string array.

但是..我不能将数组限制为唯一的字符串.

But.. I cannot limit the array to be unique strings.

{ name: 'fail scenario', tags: ['bad', 'bad', 'array']}

我可以插入此记录，这应该是失败的情况.

I'm able to insert this record which should be a fail scenario.

推荐答案

const express = require('express');
const router = express.Router();
const mongoose = require('mongoose');
const _ = require('underscore');

let sampleSchema = new mongoose.Schema({
  name: {
    type: 'String',
    unique: true
  },
  tags: [{
    type: 'String'
  }]
})
sampleSchema.pre('save', function (next) {
  this.tags = _.unique(this.tags);
  next();
});
const Sample = mongoose.model('sample', sampleSchema, 'samples');


router.post('/sample', function (req, res, next) {
  const sample = new Sample(req.body);

  sample.save()
    .then((sample) => {
      return res.send(sample);
    })
    .catch(err => {
      return res.status(500).send(err.message);
    })
});

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