From 1c50d6ae2bee31ccf605066186d4d48aaf2de7ea Mon Sep 17 00:00:00 2001
From: Anubhav Joshi <anubhav9042@gmail.com>
Date: Fri, 20 Jun 2014 10:30:04 +0530
Subject: [PATCH] Fixed problem introduced with #refs 13711.

---
 django/db/backends/__init__.py            | 4 ++++
 django/db/backends/oracle/base.py         | 1 +
 django/db/models/base.py                  | 2 +-
 tests/invalid_models_tests/test_models.py | 2 +-
 4 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index 8acfde014c..a7252cf57d 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -520,6 +520,10 @@ class BaseDatabaseFeatures(object):
     # at the end of each save operation?
     supports_forward_references = True
 
+    # Does the backend uses proper method like 'truncate_name'
+    # to auto-truncate column names?
+    truncates_name = False
+
     # Is there a REAL datatype in addition to floats/doubles?
     has_real_datatype = False
     supports_subqueries_in_group_by = True
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index 8bd7f04086..3f596ef425 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -107,6 +107,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     supports_bitwise_or = False
     can_defer_constraint_checks = True
     supports_partially_nullable_unique_constraints = False
+    truncates_name = True
     has_bulk_insert = True
     supports_tablespaces = True
     supports_sequence_reset = False
diff --git a/django/db/models/base.py b/django/db/models/base.py
index 74bece1f5c..6c59c0038a 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -1469,7 +1469,7 @@ class Model(six.with_metaclass(ModelBase)):
                 continue
             connection = connections[db]
             max_name_length = connection.ops.max_name_length()
-            if max_name_length is None:
+            if max_name_length is None or connection.features.truncates_name:
                 continue
             else:
                 if allowed_len is None:
diff --git a/tests/invalid_models_tests/test_models.py b/tests/invalid_models_tests/test_models.py
index 8550dc3065..6bce3f9a26 100644
--- a/tests/invalid_models_tests/test_models.py
+++ b/tests/invalid_models_tests/test_models.py
@@ -18,7 +18,7 @@ def get_max_column_name_length():
     for db in settings.DATABASES.keys():
         connection = connections[db]
         max_name_length = connection.ops.max_name_length()
-        if max_name_length is None:
+        if max_name_length is None or connection.features.truncates_name:
             continue
         else:
             if allowed_len is None: