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Code Issues 30 Releases Wiki Activity

[1.8.x] Fixed #24307: Avoided redundant column nullability modifications on Oracle

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Thanks Joris Benschop for the report, and Tim Graham for the tests.

Backport of ceadc94f09 from master
This commit is contained in:
Shai Berger 2015-02-18 00:50:45 +02:00
parent e2a3be1e4d
commit 66d37e593c
2 changed files with 37 additions and 2 deletions
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6
django/db/backends/base/schema.py
View File

@ -593,7 +593,11 @@ class BaseDatabaseSchemaEditor(object):
))
# Nullability change?
if old_field.null != new_field.null:
if new_field.null:
if (self.connection.features.interprets_empty_strings_as_nulls and
new_field.get_internal_type() in ("CharField", "TextField")):
# The field is nullable in the database anyway, leave it alone
pass
elif new_field.null:
null_actions.append((
self.sql_alter_column_null % {
"column": self.quote_name(new_field.column),

33
tests/schema/tests.py
View File

@ -1,6 +1,7 @@
import datetime
import itertools
import unittest
from copy import copy
from django.db import (
DatabaseError, IntegrityError, OperationalError, connection,
@ -411,7 +412,7 @@ class SchemaTests(TransactionTestCase):
# Ensure the field is right afterwards
columns = self.column_classes(Author)
self.assertEqual(columns['name'][0], "TextField")
self.assertEqual(bool(columns['name'][1][6]), False)
self.assertEqual(bool(columns['name'][1][6]), bool(connection.features.interprets_empty_strings_as_nulls))
def test_alter_text_field(self):
# Regression for "BLOB/TEXT column 'info' can't have a default value")
@ -454,6 +455,36 @@ class SchemaTests(TransactionTestCase):
self.assertEqual(Author.objects.get(name='Not null author').height, 12)
self.assertEqual(Author.objects.get(name='Null author').height, 42)
def test_alter_charfield_to_null(self):
"""
#24307 - Should skip an alter statement on databases with
interprets_empty_strings_as_null when changing a CharField to null.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Author)
# Change the CharField to null
old_field = Author._meta.get_field('name')
new_field = copy(old_field)
new_field.null = True
with connection.schema_editor() as editor:
editor.alter_field(Author, old_field, new_field)
def test_alter_textfield_to_null(self):
"""
#24307 - Should skip an alter statement on databases with
interprets_empty_strings_as_null when changing a TextField to null.
"""
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Note)
# Change the TextField to null
old_field = Note._meta.get_field('info')
new_field = copy(old_field)
new_field.null = True
with connection.schema_editor() as editor:
editor.alter_field(Note, old_field, new_field)
@unittest.skipUnless(connection.features.supports_combined_alters, "No combined ALTER support")
def test_alter_null_to_not_null_keeping_default(self):
"""