#23347: Add --dry-run to migrate
-------------------------------+--------------------------------------
Reporter: Richard Eames | Owner: nobody
Type: New feature | Status: closed
Component: Migrations | Version: 1.7-rc-3
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage: Unreviewed
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 Michael):
The plan option does not help me, it just says `Raw Python operation` for
my custom migration.
I just added a error at the end of the migration, so that it rolls back,
now can run it as many times as desired, then remove the error when
confident:
{{{
from django.db import migrations
def forwards_func(apps, schema_editor):
Meeting = apps.get_model("meetings", "Meeting")
db_alias = schema_editor.connection.alias
for meeting in Meeting.objects.using(db_alias).all():
if meeting.meeting_utc is None:
print(meeting.meeting_date, meeting.meeting_time)
raise ValueError("Don't commit!") # <----------------
class Migration(migrations.Migration):
dependencies = [
('meetings', '0004_meeting_meeting_utc_meeting_time_is_null'),
]
operations = [
migrations.RunPython(forwards_func),
]
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/23347#comment:9>
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