#25922: migrate --run-syncdb with ManyToManyFields on 1.9
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Reporter: tkhyn | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.9
Severity: Normal | Keywords: migrate, syncdb, migrations
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Hello,
I've run into an issue with Django 1.9's new {{{migrate --run-syncdb}}}
command, which is supposed to replace {{{syncdb}}}. It does not seem to be
related to #25884.
Basically, the workflow syncdb => makemigrations => migrate --fake-initial
is broken when ManyToManyFields are used in models. Using any other field
(even FKs) work fine.
I found out that when running {{{migrate --fake-initial}}},
{{{MigrationExecutor.detect_soft_applied}}} could not find a matching
column for the M2M field in the existing table, and therefore considers
that the initial migration has not been implicitly applied. My
understanding is that {{{migrate --run-syncdb}}} failed to create that in
the first place.
I have set up a minimal project to expose the issue:
- [https://bitbucket.org/tkhyn/dj19_run_syncdb/src/default not working
with Django 1.9]
- [https://bitbucket.org/tkhyn/dj19_run_syncdb/src/dj18 working like a
charm with Django 1.8]
My use case ? [https://bitbucket.org/tkhyn/django-gm2m django-gm2m]'s test
suite needs to initialize individual apps one by one and sync the db
before each TestCase (and then run migration tests from that state).
Thanks in advance for looking into this, and thanks already for all the
work put in Django so far!
--
Ticket URL: <https://code.djangoproject.com/ticket/25922>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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