Refs #29444 -- Removed redundant DatabaseFeatures.can_return_multiple_columns_from_insert.

Unnecessary since b31e63879eb5d9717e9f890401f7222e4f00c910.

django/db/backends/base/features.py

@@ -23,7 +23,6 @@ class BaseDatabaseFeatures:
 
     can_use_chunked_reads = True
     can_return_columns_from_insert = False
-    can_return_multiple_columns_from_insert = False
     can_return_rows_from_bulk_insert = False
     has_bulk_insert = True
     uses_savepoints = True

django/db/backends/oracle/features.py

@@ -10,7 +10,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     has_select_for_update_of = True
     select_for_update_of_column = True
     can_return_columns_from_insert = True
-    can_return_multiple_columns_from_insert = True
     can_introspect_autofield = True
     supports_subqueries_in_group_by = False
     supports_transactions = True

django/db/backends/postgresql/features.py

@@ -8,7 +8,6 @@ from django.utils.functional import cached_property
 class DatabaseFeatures(BaseDatabaseFeatures):
     allows_group_by_selected_pks = True
     can_return_columns_from_insert = True
-    can_return_multiple_columns_from_insert = True
     can_return_rows_from_bulk_insert = True
     has_real_datatype = True
     has_native_uuid_field = True

django/db/models/sql/compiler.py

@@ -1334,14 +1334,6 @@ class SQLInsertCompiler(SQLCompiler):
             if self.connection.features.can_return_rows_from_bulk_insert and len(self.query.objs) > 1:
                 return self.connection.ops.fetch_returned_insert_rows(cursor)
             if self.connection.features.can_return_columns_from_insert:
-                if (
-                    len(self.returning_fields) > 1 and
-                    not self.connection.features.can_return_multiple_columns_from_insert
-                ):
-                    raise NotSupportedError(
-                        'Returning multiple columns from INSERT statements is '
-                        'not supported on this database backend.'
-                    )
                 assert len(self.query.objs) == 1
                 return self.connection.ops.fetch_returned_insert_columns(cursor, self.returning_params)
             return [self.connection.ops.last_insert_id(

tests/queries/test_db_returning.py

@@ -1,7 +1,7 @@
 import datetime
 
-from django.db import NotSupportedError, connection
-from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
+from django.db import connection
+from django.test import TestCase, skipUnlessDBFeature
 from django.test.utils import CaptureQueriesContext
 
 from .models import DumbCategory, NonIntegerPKReturningModel, ReturningModel
@@ -25,7 +25,6 @@ class ReturningValuesTests(TestCase):
         self.assertTrue(obj.created)
         self.assertIsInstance(obj.created, datetime.datetime)
 
-    @skipUnlessDBFeature('can_return_multiple_columns_from_insert')
     def test_insert_returning_multiple(self):
         with CaptureQueriesContext(connection) as captured_queries:
             obj = ReturningModel.objects.create()
@@ -42,19 +41,7 @@ class ReturningValuesTests(TestCase):
         self.assertTrue(obj.pk)
         self.assertIsInstance(obj.created, datetime.datetime)
 
-    @skipIfDBFeature('can_return_multiple_columns_from_insert')
-    def test_insert_returning_multiple_not_supported(self):
-        msg = (
-            'Returning multiple columns from INSERT statements is '
-            'not supported on this database backend.'
-        )
-        with self.assertRaisesMessage(NotSupportedError, msg):
-            ReturningModel.objects.create()
-
-    @skipUnlessDBFeature(
-        'can_return_rows_from_bulk_insert',
-        'can_return_multiple_columns_from_insert',
-    )
+    @skipUnlessDBFeature('can_return_rows_from_bulk_insert')
     def test_bulk_insert(self):
         objs = [ReturningModel(), ReturningModel(pk=2 ** 11), ReturningModel()]
         ReturningModel.objects.bulk_create(objs)