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df001db1a9
Black 23 enforces some slightly more specific rules about empty line counts and redundant parenthesis removal, but the result is still compatible with Black 22. (This does not actually upgrade our Python environment to Black 23 yet.) Signed-off-by: Anders Kaseorg <anders@zulip.com>
39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
from django.db import migrations
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from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
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from django.db.migrations.state import StateApps
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from django.db.models import Count
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def clear_duplicate_reactions(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
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"""Zulip's data model for reactions has enforced via code,
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nontransactionally, that they can only react with one emoji_code
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for a given reaction_type. This fixes any that were stored in the
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database via a race; the next migration will add the appropriate
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database-level unique constraint.
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"""
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Reaction = apps.get_model("zerver", "Reaction")
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duplicate_reactions = (
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Reaction.objects.all()
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.values("user_profile_id", "message_id", "reaction_type", "emoji_code")
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.annotate(Count("id"))
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.filter(id__count__gt=1)
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)
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for duplicate_reaction in duplicate_reactions:
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duplicate_reaction.pop("id__count")
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to_cleanup = Reaction.objects.filter(**duplicate_reaction)[1:]
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for reaction in to_cleanup:
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reaction.delete()
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class Migration(migrations.Migration):
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dependencies = [
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("zerver", "0286_merge_0260_0285"),
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]
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operations = [
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migrations.RunPython(
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clear_duplicate_reactions, reverse_code=migrations.RunPython.noop, elidable=True
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),
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]
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