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from django.contrib.gis.db import models
from ..utils import gisfield_may_be_null
class NamedModel(models.Model):
name = models.CharField(max_length=30)
class Meta:
abstract = True
def __str__(self):
return self.name
class Country(NamedModel):
mpoly = models.MultiPolygonField() # SRID, by default, is 4326
class CountryWebMercator(NamedModel):
mpoly = models.MultiPolygonField(srid=3857)
class City(NamedModel):
point = models.PointField()
class Meta:
app_label = "geoapp"
# This is an inherited model from City
class PennsylvaniaCity(City):
county = models.CharField(max_length=30)
founded = models.DateTimeField(null=True)
class Meta:
app_label = "geoapp"
class State(NamedModel):
poly = models.PolygonField(
null=gisfield_may_be_null
) # Allowing NULL geometries here.
class Meta:
app_label = "geoapp"
class Track(NamedModel):
line = models.LineStringField()
class MultiFields(NamedModel):
city = models.ForeignKey(City, models.CASCADE)
point = models.PointField()
poly = models.PolygonField()
class UniqueTogetherModel(models.Model):
city = models.CharField(max_length=30)
point = models.PointField()
class Meta:
unique_together = ("city", "point")
required_db_features = ["supports_geometry_field_unique_index"]
class Truth(models.Model):
val = models.BooleanField(default=False)
class Feature(NamedModel):
geom = models.GeometryField()
class ThreeDimensionalFeature(NamedModel):
geom = models.GeometryField(dim=3)
class Meta:
required_db_features = {"supports_3d_storage"}
class MinusOneSRID(models.Model):
geom = models.PointField(srid=-1) # Minus one SRID.
class NonConcreteField(models.IntegerField):
def db_type(self, connection):
return None
def get_attname_column(self):
attname, column = super().get_attname_column()
return attname, None
class NonConcreteModel(NamedModel):
non_concrete = NonConcreteField()
point = models.PointField(geography=True)
class ManyPointModel(NamedModel):
point1 = models.PointField()
point2 = models.PointField()
point3 = models.PointField(srid=3857)
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