#24513: "... has no field named None" with M2MField when migrating
-------------------------------+-----------------------------
Reporter: Kondou-ger | Owner: nobody
Type: Uncategorized | Status: new
Component: Migrations | Version: 1.8rc1
Severity: Normal | Keywords: migrations, bug
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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In Django 1.8c1 migrations from scratch don't work for me anymore, this
effectively prevents testing.
(When you see project I'm talking about an app, btw)
See file traceback.txt for a test-call and a backtrace.
See file 0011_auto_20140914_2032.py for the migration that failed.
And see file user_model.py for the model that should be migrated.
---
I can't provide much code sadly. I tried to simplify my big project, but I
can't get it done without disclosing half of my product (or it would take
me days to do so …).
Instead I did a git-bisect to get the commit that makes my migrations
fail:
{{{
(testenv)kondou:django/ (4e9ecfe) $ git bisect good
a1ba4627931591b80afa46e38e261f354151d91a is the first bad commit
commit a1ba4627931591b80afa46e38e261f354151d91a
Author: Markus Holtermann <[email protected]>
Date: Mon Feb 9 01:11:25 2015 +0100
[1.8.x] Fixed #24225, #24264, #24282 -- Rewrote model reloading in
migration project state
Instead of naively reloading only directly related models (FK, O2O,
M2M
relationship) the project state needs to reload their relations as
well
as the model changes as well. Furthermore inheriting models (and super
models) need to be reloaded in order to keep inherited fields in sync.
To prevent endless recursive calls an iterative approach is taken.
Backport of b29f3b51204d53c1c8745966476543d068c173a2 from master
:040000 040000 2faa54b906f309ddb353a73abbef7db950b18d1c
2eb05be062be72e8a8f4d54961fbe3ec96d0edf1 M django
}}}
Doing a git revert a1ba4627931591b80afa46e38e261f354151d91a on 1.8c1 tag
indeed fixes this problem for me.
--
Ticket URL: <https://code.djangoproject.com/ticket/24513>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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