snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

zerver/migrations/0574_backfill_directmessagegroup_group_size.py

@@ -0,0 +1,79 @@
+# Generated by Django 5.0.6 on 2024-08-16 06:44
+
+from django.db import connection, migrations
+from django.db.backends.base.schema import BaseDatabaseSchemaEditor
+from django.db.migrations.state import StateApps
+
+BATCH_SIZE = 1000
+
+
+def backfill_group_size_field_for_direct_message_groups(
+    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
+) -> None:
+    Recipient = apps.get_model("zerver", "Recipient")
+
+    RECIPIENT_DIRECT_MESSAGE_GROUP = 3
+
+    direct_message_group_recipient_entries = Recipient.objects.filter(
+        type=RECIPIENT_DIRECT_MESSAGE_GROUP
+    )
+
+    if not direct_message_group_recipient_entries.exists():
+        return
+
+    recipient_id_lower_bound = direct_message_group_recipient_entries.earliest("id").id
+    max_recipient_id = Recipient.objects.latest("id").id
+
+    # We would like to set the upper bound significantly past the
+    # maximum recipient id, because it is likely that new Direct
+    # Message Groups are created during this transaction, and their
+    # recipient id is assigned as the one right after the max id.
+    max_recipient_id += BATCH_SIZE
+
+    while recipient_id_lower_bound <= max_recipient_id:
+        do_backfill_group_size_field_for_direct_message_groups(
+            recipient_id_lower_bound,
+            min(recipient_id_lower_bound + BATCH_SIZE, max_recipient_id),
+        )
+        recipient_id_lower_bound += BATCH_SIZE + 1
+
+
+def do_backfill_group_size_field_for_direct_message_groups(
+    recipient_id_lower_bound: int,
+    recipient_id_upper_bound: int,
+) -> None:
+    with connection.cursor() as cursor:
+        update_query = """
+        UPDATE zerver_huddle
+        SET group_size = (
+            SELECT COUNT(*)
+            FROM zerver_subscription
+            WHERE zerver_subscription.recipient_id = zerver_huddle.recipient_id
+        )
+        WHERE zerver_huddle.recipient_id BETWEEN %(lower_bound)s AND %(upper_bound)s
+        AND zerver_huddle.group_size IS NULL
+        """
+
+        cursor.execute(
+            update_query,
+            {
+                "lower_bound": recipient_id_lower_bound,
+                "upper_bound": recipient_id_upper_bound,
+            },
+        )
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ("zerver", "0573_directmessagegroup_group_size"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            backfill_group_size_field_for_direct_message_groups,
+            elidable=True,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]