How to make "manual" select_related imitation to avoid undesirable DB hits?

we have:

class Country:
    name = CharField()
class City:
    country = models.ForeignKey(Country)
    name = models.CharField()

cities = City.objects.raw("select * from city inner join country on city.country_id = country.id where name = 'london'")

#this will hill hit DB
print cities[0].country.name

How to tell django that related models are already fetched.

django orm django-models
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