+
−from django.contrib.gis.db import models
+
−from django.contrib.gis.tests.utils import mysql
+
−
+
−# MySQL spatial indices can't handle NULL geometries.
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−null_flag = not mysql
+
−
+
−class Country(models.Model):
+
−    name = models.CharField(max_length=30)
+
−    mpoly = models.MultiPolygonField() # SRID, by default, is 4326
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−    objects = models.GeoManager()
+
−    def __unicode__(self): return self.name
+
−
+
−class City(models.Model):
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−    name = models.CharField(max_length=30)
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−    point = models.PointField() 
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−    objects = models.GeoManager()
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−    def __unicode__(self): return self.name
+
−
+
−class State(models.Model):
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−    name = models.CharField(max_length=30)
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−    poly = models.PolygonField(null=null_flag) # Allowing NULL geometries here.
+
−    objects = models.GeoManager()
+
−    def __unicode__(self): return self.name
+
−
+
−class Feature(models.Model):
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−    name = models.CharField(max_length=20)
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−    geom = models.GeometryField()
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−    objects = models.GeoManager()
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−    def __unicode__(self): return self.name
+
−
+
−class MinusOneSRID(models.Model):
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−    geom = models.PointField(srid=-1) # Minus one SRID.
+
−    objects = models.GeoManager()