app/django/contrib/gis/db/backend/postgis/models.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Tue, 14 Oct 2008 16:00:59 +0000
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"""
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 The GeometryColumns and SpatialRefSys models for the PostGIS backend.
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"""
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from django.db import models
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from django.contrib.gis.models import SpatialRefSysMixin
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# Checking for the presence of GDAL (needed for the SpatialReference object)
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from django.contrib.gis.gdal import HAS_GDAL
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if HAS_GDAL:
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    from django.contrib.gis.gdal import SpatialReference
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class GeometryColumns(models.Model):
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    """
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    The 'geometry_columns' table from the PostGIS. See the PostGIS
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    documentation at Ch. 4.2.2.
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    """
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    f_table_catalog = models.CharField(max_length=256)
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    f_table_schema = models.CharField(max_length=256)
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    f_table_name = models.CharField(max_length=256)
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    f_geometry_column = models.CharField(max_length=256)
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    coord_dimension = models.IntegerField()
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    srid = models.IntegerField(primary_key=True)
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    type = models.CharField(max_length=30)
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    class Meta:
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        db_table = 'geometry_columns'
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    @classmethod
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    def table_name_col(cls):
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        """
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        Returns the name of the metadata column used to store the 
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        the feature table name.
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        """
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        return 'f_table_name'
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    @classmethod
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    def geom_col_name(cls):
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        """
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        Returns the name of the metadata column used to store the 
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        the feature geometry column.
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        """
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        return 'f_geometry_column'
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    def __unicode__(self):
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        return "%s.%s - %dD %s field (SRID: %d)" % \
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               (self.f_table_name, self.f_geometry_column,
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                self.coord_dimension, self.type, self.srid)
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class SpatialRefSys(models.Model, SpatialRefSysMixin):
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    """
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    The 'spatial_ref_sys' table from PostGIS. See the PostGIS
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    documentaiton at Ch. 4.2.1.
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    """
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    srid = models.IntegerField(primary_key=True)
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    auth_name = models.CharField(max_length=256)
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    auth_srid = models.IntegerField()
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    srtext = models.CharField(max_length=2048)
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    proj4text = models.CharField(max_length=2048)
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    class Meta:
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        db_table = 'spatial_ref_sys'
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    @property
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    def wkt(self):
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        return self.srtext
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    @classmethod
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    def wkt_col(cls):
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        return 'srtext'