1 from django.contrib.gis.db import models

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

     3 

     4 class Location(models.Model):

     5     point = models.PointField()

     6     objects = models.GeoManager()

     7     def __unicode__(self): return self.point.wkt

     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()

    14     def __unicode__(self): return self.name

    15 

    16 class AugmentedLocation(Location):

    17     extra_text = models.TextField(blank=True)

    18     objects = models.GeoManager()

    19     

    20 class DirectoryEntry(models.Model):

    21     listing_text = models.CharField(max_length=50)

    22     location = models.ForeignKey(AugmentedLocation)

    23     objects = models.GeoManager()

    24 

    25 class Parcel(models.Model):

    26     name = models.CharField(max_length=30)

    27     city = models.ForeignKey(City)

    28     center1 = models.PointField()

    29     # Throwing a curveball w/`db_column` here.

    30     center2 = models.PointField(srid=2276, db_column='mycenter') 

    31     border1 = models.PolygonField()

    32     border2 = models.PolygonField(srid=2276)

    33     objects = models.GeoManager()

    34     def __unicode__(self): return self.name

    35 

    36 # These use the GeoManager but do not have any geographic fields.

    37 class Author(models.Model):

    38     name = models.CharField(max_length=100)

    39     objects = models.GeoManager()

    40 

    41 class Book(models.Model):

    42     title = models.CharField(max_length=100)

    43     author = models.ForeignKey(Author, related_name='books', null=True)

    44     objects = models.GeoManager()