1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
from django.contrib.gis.db import models
from django.utils.encoding import python_2_unicode_compatible
class SimpleModel(models.Model):
objects = models.GeoManager()
class Meta:
abstract = True
app_label = 'relatedapp'
@python_2_unicode_compatible
class Location(SimpleModel):
point = models.PointField()
def __str__(self):
return self.point.wkt
@python_2_unicode_compatible
class City(SimpleModel):
name = models.CharField(max_length=50)
state = models.CharField(max_length=2)
location = models.ForeignKey(Location)
def __str__(self):
return self.name
class AugmentedLocation(Location):
extra_text = models.TextField(blank=True)
objects = models.GeoManager()
class Meta:
app_label = 'relatedapp'
class DirectoryEntry(SimpleModel):
listing_text = models.CharField(max_length=50)
location = models.ForeignKey(AugmentedLocation)
@python_2_unicode_compatible
class Parcel(SimpleModel):
name = models.CharField(max_length=30)
city = models.ForeignKey(City)
center1 = models.PointField()
# Throwing a curveball w/`db_column` here.
center2 = models.PointField(srid=2276, db_column='mycenter')
border1 = models.PolygonField()
border2 = models.PolygonField(srid=2276)
def __str__(self):
return self.name
# These use the GeoManager but do not have any geographic fields.
class Author(SimpleModel):
name = models.CharField(max_length=100)
dob = models.DateField()
class Article(SimpleModel):
title = models.CharField(max_length=100)
author = models.ForeignKey(Author, unique=True)
class Book(SimpleModel):
title = models.CharField(max_length=100)
author = models.ForeignKey(Author, related_name='books', null=True)
|
