1 from django.contrib.gis.db import models

     2 from django.contrib.gis.tests.utils import mysql, spatialite

     3 

     4 # MySQL spatial indices can't handle NULL geometries.

     5 null_flag = not mysql

     6 

     7 class Country(models.Model):

     8     name = models.CharField(max_length=30)

     9     mpoly = models.MultiPolygonField() # SRID, by default, is 4326

    10     objects = models.GeoManager()

    11     def __unicode__(self): return self.name

    12 

    13 class City(models.Model):

    14     name = models.CharField(max_length=30)

    15     point = models.PointField()

    16     objects = models.GeoManager()

    17     def __unicode__(self): return self.name

    18 

    19 # This is an inherited model from City

    20 class PennsylvaniaCity(City):

    21     county = models.CharField(max_length=30)

    22     objects = models.GeoManager() # TODO: This should be implicitly inherited.

    23 

    24 class State(models.Model):

    25     name = models.CharField(max_length=30)

    26     poly = models.PolygonField(null=null_flag) # Allowing NULL geometries here.

    27     objects = models.GeoManager()

    28     def __unicode__(self): return self.name

    29 

    30 if not spatialite:

    31     class Feature(models.Model):

    32         name = models.CharField(max_length=20)

    33         geom = models.GeometryField()

    34         objects = models.GeoManager()

    35         def __unicode__(self): return self.name

    36 

    37     class MinusOneSRID(models.Model):

    38         geom = models.PointField(srid=-1) # Minus one SRID.

    39         objects = models.GeoManager()