Recently, I got stuck scratching my head, because of how TypeORM behaves, given entities:

class Event extends BaseEntity {
    location: Address
}

class Address {
    @Column({ type: 'varchar' })
    city: string
}

Now if I want to select the event’s city, apparently I can do it in two ways, which is confusing:

jobEventRepo.createQueryBuilder('jobEvent').select('location.city')
// or 
jobEventRepo.createQueryBuilder('jobEvent').select('city')

Both work the same, the first one was what I was using for long, but the second – shorthand way for doing the same I just discovered accidentally. Why do both work, is there a documentation for that, is one of those preferred?