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c04558fe31
Fixes #34246. Add subscriber_count field to Stream model to track number of non-deactivated users subscribed to the channel.
57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
from django.db import connection, 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 psycopg2 import sql
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def set_stream_subscribe_count(apps: StateApps, schema_editor: BaseDatabaseSchemaEditor) -> None:
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Realm = apps.get_model("zerver", "realm")
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Stream = apps.get_model("zerver", "Stream")
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Subscription = apps.get_model("zerver", "subscription")
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Recipient = apps.get_model("zerver", "recipient")
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# Here we compute per-stream subscriber_count in the sub-query
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# which returns a stream_subscribers_table, then Update it
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# in-place using that computed value. The whole query is then
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# executed by one batch per realm.
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query = sql.SQL(
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"""UPDATE {stream_table} AS stream
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SET subscriber_count = stream_subscribers_table.count
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FROM (
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SELECT recipient.type_id AS stream_id,
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COUNT(subscription.user_profile_id) AS count
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FROM {subscription_table} AS subscription
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JOIN {recipient_table} AS recipient
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ON subscription.recipient_id = recipient.id
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WHERE
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recipient.type = 2
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AND subscription.active = True
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AND subscription.is_user_active = True
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GROUP BY stream_id
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) AS stream_subscribers_table
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WHERE
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stream.realm_id = %(realm_id)s
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AND stream.id = stream_subscribers_table.stream_id;
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"""
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).format(
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stream_table=sql.Identifier(Stream._meta.db_table),
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subscription_table=sql.Identifier(Subscription._meta.db_table),
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recipient_table=sql.Identifier(Recipient._meta.db_table),
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)
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for realm in Realm.objects.all():
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with connection.cursor() as cursor, transaction.atomic(durable=True):
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cursor.execute(query, {"realm_id": realm.id})
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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("zerver", "0704_stream_subscriber_count"),
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]
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operations = [
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migrations.RunPython(set_stream_subscribe_count),
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]
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