Fixed #31751 -- Fixed database introspection with cx_Oracle 8.

1 files changed, 7 insertions, 2 deletions

diff --git a/django/contrib/gis/db/backends/oracle/introspection.py b/django/contrib/gis/db/backends/oracle/introspection.py
index f97f0e1446..493fe74b46 100644
--- a/django/contrib/gis/db/backends/oracle/introspection.py
+++ b/django/contrib/gis/db/backends/oracle/introspection.py
@@ -1,14 +1,19 @@
 import cx_Oracle
 
 from django.db.backends.oracle.introspection import DatabaseIntrospection
+from django.utils.functional import cached_property
 
 
 class OracleIntrospection(DatabaseIntrospection):
     # Associating any OBJECTVAR instances with GeometryField. This won't work
     # right on Oracle objects that aren't MDSYS.SDO_GEOMETRY, but it is the
     # only object type supported within Django anyways.
-    data_types_reverse = DatabaseIntrospection.data_types_reverse.copy()
-    data_types_reverse[cx_Oracle.OBJECT] = 'GeometryField'
+    @cached_property
+    def data_types_reverse(self):
+        return {
+            **super().data_types_reverse,
+            cx_Oracle.OBJECT: 'GeometryField',
+        }
 
     def get_geometry_type(self, table_name, description):
         with self.connection.cursor() as cursor: