Create Unique Index in ref Mongoose

Question

I have these schema:

var userSchema = new mongoose.Schema({
    username: {type: String,unique: true}
});

mongoose.model( 'User', userSchema );


var fooSchema = new mongoose.Schema({
    title : {type: String,trim: true},
    owner : {type: mongoose.Schema.Types.ObjectId, ref: 'User'}
});

fooSchema.index({ title: 1, owner: 1 }, { unique: true }); //does not work
mongoose.model( 'Foo', fooSchema);

I Want Use Validation, then each foo can have unique title with unique user

I try did

fooSchema.index({ title: 1, owner: 1 }, { unique: true });

But I Have an error also if another user create new foo with same title

UPDATE: I added unique: true to username, but i have the same issue

Answer 1

For new viewers to this dormant thread:

mySchema.index({field1: 1, field2: 1}, {unique: true});

See this thread:

Creating Multifield Indexes in Mongoose / MongoDB