Can't get Mongoose virtuals to be part of the result object
Because you're using JSON.stringify in your console.log call, that invokes the toJSON method on the model instance, not toObject.
So either omit the JSON.stringify in your call:
console.log(results[0]);Or set the toJSON option on the schema like you're currently setting the toObject option.
...{ toObject: { virtuals: true }, toJSON: { virtuals: true }});