"唯一验证在 Mongoose 中不起作用"

Question

I recognized this question has been<\/a> asked<\/a> before<\/a> , but none of the solutions seemed to work for me.

const mongoose = require('mongoose')
const { Schema } = mongoose

let subscriberSchema = new Schema({
  firstName: { type: String, required: true },
  email: { type: String, required: true, unique: true }
}, { timestamps: true })

let Subscriber = mongoose.model('Subscriber', subscriberSchema)

Answer 1

This is very complicated thing to solve with node, as you know its async. If you are running both queries parallel, both will check if doc exists as same time and both will try to create the record.

There are two things you could do.

Create Unique Index

YourModel.index({ email: 1}, { unique: true })

OR
Use Update with $setOnInsert

var pk = {email : 'your email'};
YourModel.update(pk, {
        $setOnInsert : data
    }, {upsert : true})

And Make sure the index exists in mongoDB.

Mongoose does not modify index on key set. First try to remove index from mongo shell.

 db.collection.dropIndex({email : 1})

Restart node process and mongoose will now create index with unique constraint.

Answer 2

Actually, unique option for validation working,how?Follow these steps:
1)set unique: true for certain field in schema(example "email")
2)drop whole db
3)restart node server
4)test in postman and you will see than now works

Cheers.

Answer 3

Make autoIndex: true while connecting to the database.

mongoose
.connect('connection url', {
    useUnifiedTopology: true,
    useNewUrlParser: true,
    autoIndex: true, //make this true
})
.then(() => {
    console.log('Connected to mongoDB');
});