Added feature flag for geometry_field_introspection; refs #22632 and #23504.

django/contrib/gis/db/backends/base.py

@@ -18,6 +18,8 @@ class BaseSpatialFeatures(object):
 
     # Does the backend support the django.contrib.gis.utils.add_srs_entry() utility?
     supports_add_srs_entry = True
+    # Does the backend introspect GeometryField to its subtypes?
+    supports_geometry_field_introspection = True
 
     # Reference implementation of 3D functions is:
     # http://postgis.net/docs/PostGIS_Special_Functions_Index.html#PostGIS_3D_Functions

django/contrib/gis/db/backends/oracle/base.py

@@ -10,6 +10,7 @@ from django.contrib.gis.db.backends.oracle.operations import OracleOperations
 
 class DatabaseFeatures(BaseSpatialFeatures, OracleDatabaseFeatures):
     supports_add_srs_entry = False
+    supports_geometry_field_introspection = False
 
 
 class DatabaseWrapper(OracleDatabaseWrapper):

django/contrib/gis/tests/inspectapp/tests.py

@@ -5,7 +5,7 @@ import re
 from unittest import skipUnless
 
 from django.core.management import call_command
-from django.db import connections
+from django.db import connection, connections
 from django.test import TestCase, skipUnlessDBFeature
 from django.contrib.gis.gdal import HAS_GDAL
 from django.contrib.gis.geometry.test_data import TEST_DATA
@@ -30,8 +30,12 @@ class InspectDbTests(TestCase):
                  table_name_filter=lambda tn: tn.startswith('inspectapp_'),
                  stdout=out)
         output = out.getvalue()
-        self.assertIn('geom = models.PolygonField()', output)
-        self.assertIn('point = models.PointField()', output)
+        if connection.features.supports_geometry_field_introspection:
+            self.assertIn('geom = models.PolygonField()', output)
+            self.assertIn('point = models.PointField()', output)
+        else:
+            self.assertIn('geom = models.GeometryField(', output)
+            self.assertIn('point = models.GeometryField(', output)
         self.assertIn('objects = models.GeoManager()', output)