#22983: Invalid import in a squashed migration of migrations having RunPython
---------------------------------+----------------------------------------
Reporter: riklaunim | Owner: andrewgodwin
Type: Bug | Status: assigned
Component: Migrations | Version: 1.7-rc-1
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by generalov):
I put all data migration functions in separate module
`migrations/datamigrations/__init__.py` then import code from it to
migration module.
{{{
# 0002_some_migration.py
from . import datamigrations
class Migration(migrations.Migration):
operations = [
migrations.RunPython(datamigrations.fix_data),
}}}
In this case the `squashmigrations` builds the following result:
{{{
import project.app.migrations.datamigrations
class Migration(migrations.Migration):
operations = [
migrations.RunPython(
code=project.app.migrations.datamigrations.fill_serial,
reverse_code=None,
atomic=True,
),
}}}
The code looks bit ugly but it works without any modifications.
I create `datamigration` as package instead of just file module beacause
otherwise `manage.py squashmigrations ..` fails with exception
`django.db.migrations.loader.BadMigrationError: Migration datamigrations
in app app has no Migration class`
--
Ticket URL: <https://code.djangoproject.com/ticket/22983#comment:10>
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