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c6a06d4684
This commit adds a new `group_size` field to the `DirectMessageGroup` model, and backfills its value to each of the existing direct message groups. Fixes part of #25713
79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
# Generated by Django 5.0.6 on 2024-08-16 06:44
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from django.db import migrations, transaction
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from django.db.backends.base.schema import BaseDatabaseSchemaEditor
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from django.db.migrations.state import StateApps
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from django.db.models import Count, Model, OuterRef, Subquery
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BATCH_SIZE = 1000
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def backfill_group_size_field_for_direct_message_groups(
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apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
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) -> None:
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DirectMessageGroup = apps.get_model("zerver", "DirectMessageGroup")
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Recipient = apps.get_model("zerver", "Recipient")
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Subscription = apps.get_model("zerver", "Subscription")
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RECIPIENT_DIRECT_MESSAGE_GROUP = 3
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direct_message_group_recipient_entries = Recipient.objects.filter(
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type=RECIPIENT_DIRECT_MESSAGE_GROUP
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)
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if not direct_message_group_recipient_entries.exists():
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return
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recipient_id_lower_bound = direct_message_group_recipient_entries.earliest("id").id
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max_recipient_id = Recipient.objects.latest("id").id
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# We would like to set the upper bound significantly past the
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# maximum recipient id, because it is likely that new Direct
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# Message Groups are created during this transaction, and their
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# recipient id is assigned as the one right after the max id.
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max_recipient_id += BATCH_SIZE
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while recipient_id_lower_bound <= max_recipient_id:
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do_backfill_group_size_field_for_direct_message_groups(
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Subscription,
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DirectMessageGroup,
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recipient_id_lower_bound,
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min(recipient_id_lower_bound + BATCH_SIZE, max_recipient_id),
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)
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recipient_id_lower_bound += BATCH_SIZE + 1
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@transaction.atomic
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def do_backfill_group_size_field_for_direct_message_groups(
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subscription_model: type[Model],
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direct_message_group_model: type[Model],
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recipient_id_lower_bound: int,
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recipient_id_upper_bound: int,
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) -> None:
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direct_message_group_sub_size = (
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subscription_model._default_manager.filter(recipient=OuterRef("recipient"))
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.values("recipient")
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.annotate(count=Count("id"))
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.values("count")[:1]
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)
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direct_message_group_model._default_manager.filter(
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recipient__id__range=(recipient_id_lower_bound, recipient_id_upper_bound), group_size=None
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).update(group_size=Subquery(direct_message_group_sub_size))
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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("zerver", "0573_directmessagegroup_group_size"),
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]
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operations = [
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migrations.RunPython(
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backfill_group_size_field_for_direct_message_groups,
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elidable=True,
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reverse_code=migrations.RunPython.noop,
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),
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]
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