javascript - How to set user accounts not to be duplicated in mongodb?

Question

User registration has two attributes, name and address. How to set up the database so that these two attributes are equal without duplication.
What I mean is that I don’t want one address to correspond to multiple usernames

Thank you

Answer 1

If I understand correctly, create a unique matching index:

.createIndex( { name: 1, address: 1 }, { unique: true } )

It is recommended to check the official MongoDB manual to improve work efficiency.

Love MongoDB, Have Fun!

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Answer 2

var studentSchema = new Schema({
  school:String,
  nickname:String,
  username:{
    type:String,
    unique:true
  },.....
}

Mine schema is like that, you can try the following and see if it works

name:{
type:String,
unique:true
},
address:{
type:String,
unique:true
}