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mongodbvalidationindexingmongooseunique

Are field level uniqueness constraints still supported in Mongo(ose)?

It looks like mongoose supported field level uniqueness constraints in earlier versions as follows (seen in 2.7.x here):

var SomeSchema = new Schema ({
  field: {index: {unique: true}} // field level
})

I can't find any reference to it in the 4.4.x docs. Is the preferred way to do this on the schema level now, like so (seen in 4.4.x here):

SomeSchema.index({field: 1}, {unique: true}) // schema level
Solution

  • Yes, unique indexes are still supported in Mongoose; see here and here in the current docs.

    Examples from the linked docs:

    var s = new Schema({ date: { type: Date, index: { unique: true, expires: '1d' }});
var s = new Schema({ name: { type: String, unique: true }});

Schema.path('my.path').index({ unique: true, sparse: true });
Schema.path('name').index({ unique: true });