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retention: Add a quick comment explaining how deletion works.

This commit is contained in:
Tim Abbott 2019-06-06 11:41:07 -07:00
parent 323be57151
commit 065575debf
1 changed files with 4 additions and 0 deletions
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zerver/lib/retention.py
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@ -166,6 +166,10 @@ def move_attachments_message_rows_to_archive(msg_ids: List[int]) -> None:
cursor.execute(query.format(message_ids=ids_list_to_sql_query_format(msg_ids))) cursor.execute(query.format(message_ids=ids_list_to_sql_query_format(msg_ids)))
def delete_messages(msg_ids: List[int]) -> None: def delete_messages(msg_ids: List[int]) -> None:
# Important note: This also deletes related objects with a foreign
# key to Message (due to `on_delete=CASCADE` in our models
# configuration), so we need to be sure we've taken care of
# archiving the messages before doing this step.
Message.objects.filter(id__in=msg_ids).delete() Message.objects.filter(id__in=msg_ids).delete()
def delete_expired_attachments() -> None: def delete_expired_attachments() -> None: