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Add backwards data migration

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The documents.tests.test_migration_mime_type test suite failes if no
backwards migration is provided. This simple backwards migration sets
the old assign_tag field with a tag if exactly one is set in
assign_tags.
This commit is contained in:
jonasc 2022-03-11 17:02:59 +01:00
parent 37f7ef41f2
commit 5ff304324d
1 changed files with 16 additions and 2 deletions
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18
src/paperless_mail/migrations/0010_auto_20220311_1602.py
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@ -3,7 +3,7 @@
from django.db import migrations
def migrate_tag(apps, schema_editor):
def migrate_tag_to_tags(apps, schema_editor):
# Manual data migration, see
# https://docs.djangoproject.com/en/3.2/topics/migrations/#data-migrations
#
@ -15,6 +15,20 @@ def migrate_tag(apps, schema_editor):
mail_rule.save()
def migrate_tags_to_tag(apps, schema_editor):
# Manual data migration, see
# https://docs.djangoproject.com/en/3.2/topics/migrations/#data-migrations
#
# Copy the unique value in the assign_tags set to the old assign_tag property.
# Do nothing if the tag is not unique.
MailRule = apps.get_model("paperless_mail", "MailRule")
for mail_rule in MailRule.objects.all():
tags = mail_rule.assign_tags.all()
if len(tags) == 1:
mail_rule.assign_tag = tags[0]
mail_rule.save()
class Migration(migrations.Migration):
dependencies = [
@ -22,5 +36,5 @@ class Migration(migrations.Migration):
]
operations = [
migrations.RunPython(migrate_tag),
migrations.RunPython(migrate_tag_to_tags, migrate_tags_to_tag),
]