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retention: Fix migration making archive_transaction field not null. 

DELETing from archive tables and ALTERing ArchivedMessage needs to be
split into separate transactions.

zerver_archivedattachment_messages needs to be cleared out before
zerver_archivedattachment.
This commit is contained in:
Mateusz Mandera 2019-07-05 00:50:38 +02:00 committed by Tim Abbott
parent e14a40675b
commit b8839302c0
1 changed files with 17 additions and 8 deletions
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25
zerver/migrations/0232_make_archive_transaction_field_not_nullable.py
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@ -4,21 +4,30 @@ from __future__ import unicode_literals
from django.db import migrations, models
import django.db.models.deletion
class Migration(migrations.Migration):
"""
Tables cannot have data deleted from them and be altered in a single transaction,
but we need the DELETEs to be atomic together. So we set atomic=False for the migration
in general, and run the DELETEs in one transaction, and AlterField in another.
"""
atomic = False
dependencies = [
('zerver', '0231_add_archive_transaction_model'),
]
operations = [
migrations.RunSQL("DELETE FROM zerver_archivedusermessage"),
migrations.RunSQL("DELETE FROM zerver_archivedreaction"),
migrations.RunSQL("DELETE FROM zerver_archivedsubmessage"),
migrations.RunSQL("DELETE FROM zerver_archivedattachment"),
migrations.RunSQL("DELETE FROM zerver_archivedattachment_messages"),
migrations.RunSQL("DELETE FROM zerver_archivedmessage"),
migrations.RunSQL("DELETE FROM zerver_archivetransaction"),
migrations.RunSQL("""
BEGIN;
DELETE FROM zerver_archivedusermessage;
DELETE FROM zerver_archivedreaction;
DELETE FROM zerver_archivedsubmessage;
DELETE FROM zerver_archivedattachment_messages;
DELETE FROM zerver_archivedattachment;
DELETE FROM zerver_archivedmessage;
DELETE FROM zerver_archivetransaction;
COMMIT;
"""),
migrations.AlterField(
model_name='archivedmessage',
name='archive_transaction',