1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
From: Simon Charette <charette.s@gmail.com>
Date: Thu, 6 Dec 2018 11:37:43 -0500
Subject: Fixed #29182 -- Adjusted SQLite schema table alteration to support
3.26.
SQLite 3.26 repoints foreign key constraints on table renames even when
foreign_keys pragma is off which breaks every operation that requires
a table rebuild to simulate unsupported ALTER TABLE statements.
Fortunately the newly introduced legacy_alter_table pragma allows one to disable
this behavior and restore the previous schema editor assumptions.
Thanks Florian Apolloner, Christoph Trassl, Chris Lamb for the report and
troubleshooting assistance.
---
django/db/backends/sqlite3/schema.py | 2 ++
1 file changed, 2 insertions(+)
diff --git a/django/db/backends/sqlite3/schema.py b/django/db/backends/sqlite3/schema.py
index 36adb22..1cfec35 100644
--- a/django/db/backends/sqlite3/schema.py
+++ b/django/db/backends/sqlite3/schema.py
@@ -24,6 +24,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
c.execute('PRAGMA foreign_keys')
self._initial_pragma_fk = c.fetchone()[0]
c.execute('PRAGMA foreign_keys = 0')
+ c.execute('PRAGMA legacy_alter_table = ON')
return super(DatabaseSchemaEditor, self).__enter__()
def __exit__(self, exc_type, exc_value, traceback):
@@ -31,6 +32,7 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
with self.connection.cursor() as c:
# Restore initial FK setting - PRAGMA values can't be parametrized
c.execute('PRAGMA foreign_keys = %s' % int(self._initial_pragma_fk))
+ c.execute('PRAGMA legacy_alter_table = OFF')
def quote_value(self, value):
# The backend "mostly works" without this function and there are use
|
