[1.1.X] Fixed #11827: Can now calculate extent in Oracle on tables with one point.

    def convert_extent(clob):

        if clob:

            # Oracle returns a polygon for the extent, we construct

            # the 4-tuple from the coordinates in the polygon.

            poly = SpatialBackend.Geometry(clob.read())

            shell = poly.shell

            ll, ur = shell[0], shell[2]

            # Generally, Oracle returns a polygon for the extent -- however,

            # it can return a single point if there's only one Point in the

            # table.

            ext_geom = SpatialBackend.Geometry(clob.read())

            gtype = str(ext_geom.geom_type)

            if gtype == 'Polygon':

                # Construct the 4-tuple from the coordinates in the polygon.

                shell = ext_geom.shell

                ll, ur = shell[0][:2], shell[2][:2]

            elif gtype == 'Point':

                ll = ext_geom.coords[:2]

                ur = ll

            else:

                raise Exception('Unexpected geometry type returned for extent: %s' % gtype)

            xmin, ymin = ll

            xmax, ymax = ur

            return (xmin, ymin, xmax, ymax)

import os, unittest

from django.contrib.gis.db.backend import SpatialBackend

from django.contrib.gis.tests.utils import no_mysql, no_oracle, no_postgis

from django.contrib.gis.tests.utils import no_mysql, no_oracle, no_postgis, no_spatialite

from django.contrib.gis.shortcuts import render_to_kmz

from models import City

                  }]

        kmz = render_to_kmz('gis/kml/placemarks.kml', {'places' : places})

    @no_spatialite

    def test03_extent(self):

        "Testing `extent` on a table with a single point, see #11827."

        pnt = City.objects.get(name='Pueblo').point

        ref_ext = (pnt.x, pnt.y, pnt.x, pnt.y)

        self.assertEqual(ref_ext, City.objects.filter(name='Pueblo').extent())