/Javascript/Node.js/How to create alias in populate moongoose + nodejs

How to create alias in populate moongoose + nodejs

var countrySchema = new mongoose.Schema({
    capitalId: {type:String}
});

countrySchema.virtual('capital',{
    ref: 'City',
    localField: 'capitalId',
    foreignField: '_id',
    justOne: true
});

countrySchema.set('toObject', { virtuals: true });
countrySchema.set('toJSON', { virtuals: true });

Source: github.com

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