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"""
The GeometryColumns and SpatialRefSys models for the PostGIS backend.
"""
from django.contrib.gis.db.backends.base.models import SpatialRefSysMixin
from django.db import models
class PostGISGeometryColumns(models.Model):
"""
The 'geometry_columns' view from PostGIS. See the PostGIS
documentation at Ch. 4.3.2.
"""
f_table_catalog = models.CharField(max_length=256)
f_table_schema = models.CharField(max_length=256)
f_table_name = models.CharField(max_length=256)
f_geometry_column = models.CharField(max_length=256)
coord_dimension = models.IntegerField()
srid = models.IntegerField(primary_key=True)
type = models.CharField(max_length=30)
class Meta:
app_label = "gis"
db_table = "geometry_columns"
managed = False
def __str__(self):
return "%s.%s - %dD %s field (SRID: %d)" % (
self.f_table_name,
self.f_geometry_column,
self.coord_dimension,
self.type,
self.srid,
)
@classmethod
def table_name_col(cls):
"""
Return the name of the metadata column used to store the feature table
name.
"""
return "f_table_name"
@classmethod
def geom_col_name(cls):
"""
Return the name of the metadata column used to store the feature
geometry column.
"""
return "f_geometry_column"
class PostGISSpatialRefSys(models.Model, SpatialRefSysMixin):
"""
The 'spatial_ref_sys' table from PostGIS. See the PostGIS
documentation at Ch. 4.2.1.
"""
srid = models.IntegerField(primary_key=True)
auth_name = models.CharField(max_length=256)
auth_srid = models.IntegerField()
srtext = models.CharField(max_length=2048)
proj4text = models.CharField(max_length=2048)
class Meta:
app_label = "gis"
db_table = "spatial_ref_sys"
managed = False
@property
def wkt(self):
return self.srtext
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