How does Django admin determine which fields are shown
from jobs.models import *
from django.contrib import admin

admin.site.register(Country)
admin.site.register(City)

class Mymodel(Model)
    field1 = CharField()
    field3 = CharField()
    field3 = CharField()

    def __unicode__(self):
        return self.field1

>>> Mymodel.objects.get(pk=1)
"contents of field1 that will show up for all related fields in admin"

admin.site.register(Country, CountryAdmin)
admin.site.register(City, CityAdmin)