Mongoose: how to define a combination of fields to be unique?

Question

If I had a schema like this:

var person = new Schema({
  firstName:  String,
  lastName: String,
});

I'd like to ensure that there is only one document with the same firstName and lastName.

How can I accomplish this?

Answer 1

You can define a unique compound index using an index call on your schema:

person.index({ firstName: 1, lastName: 1}, { unique: true });