mirror of https://github.com/zulip/zulip.git
36 lines
1.3 KiB
Python
36 lines
1.3 KiB
Python
from django.db import migrations
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from django.db.backends.postgresql.schema import DatabaseSchemaEditor
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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: DatabaseSchemaEditor) -> 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 = Reaction.objects.all().values(
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"user_profile_id", "message_id", "reaction_type", "emoji_code").annotate(
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Count('id')).filter(id__count__gt=1)
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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(clear_duplicate_reactions,
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reverse_code=migrations.RunPython.noop,
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elidable=True),
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]
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