#25247: makemigrations unable to generate necessary migration for making a
superclass abstract
-------------------------------------+-------------------------------------
Reporter: rapilabs | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Migrations | Version: 1.8
Severity: Normal | Resolution:
Keywords: abstract | Triage Stage: Accepted
makemigrations |
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by charettes):
@MarkusH, I think it shouldn't be an issue if the sequence is started at
the referenced field's serial current value:
{{{#!sql
CREATE TABLE foo (
id serial primary key
);
CREATE TABLE bar (
foo_ptr_id integer primary key REFERENCES foo (id)
);
INSERT INTO foo DEFAULT VALUES;
INSERT INTO foo DEFAULT VALUES;
INSERT INTO foo DEFAULT VALUES;
SELECT * FROM foo;
id
----
1
2
3
(3 rows)
INSERT INTO bar SELECT id FROM foo;
SELECT * FROM bar;
foo_ptr_id
------------
1
2
3
(3 rows)
CREATE SEQUENCE bar_id_seq;
SELECT setval('bar_id_seq', currval('foo_id_seq'));
ALTER TABLE bar RENAME COLUMN foo_ptr_id TO id;
ALTER TABLE bar ALTER COLUMN id SET DEFAULT nextval('bar_id_seq');
ALTER TABLE bar DROP CONSTRAINT bar_foo_ptr_id_fkey;
INSERT INTO bar DEFAULT VALUES;
INSERT INTO bar DEFAULT VALUES;
SELECT * FROM bar;
id
----
1
2
3
4
5
(5 rows)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25247#comment:4>
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