1 from django.contrib.gis.db import models

     2 from django.contrib.localflavor.us.models import USStateField

     3 

     4 class Location(models.Model):

     5     name = models.CharField(max_length=50)

     6     point = models.PointField()

     7     objects = models.GeoManager()

     8 

     9 class City(models.Model):

    10     name = models.CharField(max_length=50)

    11     state = USStateField()

    12     location = models.ForeignKey(Location)

    13     objects = models.GeoManager()