Post deletion when the thread is deleted is already handled by django. No need to implement it manually

boards/models/thread.py

@@ -1,237 +1,227 b''
 import logging
 from adjacent import Client
 
 from django.db.models import Count, Sum, QuerySet
 from django.utils import timezone
 from django.db import models
 
 from boards import settings
 import boards
 from boards.utils import cached_result, datetime_to_epoch
 from boards.models.post import Post
 from boards.models.tag import Tag
 
 
 __author__ = 'neko259'
 
 
 logger = logging.getLogger(__name__)
 
 
 WS_NOTIFICATION_TYPE_NEW_POST = 'new_post'
 WS_NOTIFICATION_TYPE = 'notification_type'
 
 WS_CHANNEL_THREAD = "thread:"
 
 
 class ThreadManager(models.Manager):
     def process_oldest_threads(self):
         """
          Preserves maximum thread count. If there are too many threads,
          archive or delete the old ones.
          """
 
         threads = Thread.objects.filter(archived=False).order_by('-bump_time')
         thread_count = threads.count()
 
         max_thread_count = settings.get_int('Messages', 'MaxThreadCount')
         if thread_count > max_thread_count:
             num_threads_to_delete = thread_count - max_thread_count
             old_threads = threads[thread_count - num_threads_to_delete:]
 
             for thread in old_threads:
                 if settings.get_bool('Storage', 'ArchiveThreads'):
                     self._archive_thread(thread)
                 else:
                     thread.delete()
 
             logger.info('Processed %d old threads' % num_threads_to_delete)
 
     def _archive_thread(self, thread):
         thread.archived = True
         thread.bumpable = False
         thread.last_edit_time = timezone.now()
         thread.update_posts_time()
         thread.save(update_fields=['archived', 'last_edit_time', 'bumpable'])
 
 
 def get_thread_max_posts():
     return settings.get_int('Messages', 'MaxPostsPerThread')
 
 
 class Thread(models.Model):
     objects = ThreadManager()
 
     class Meta:
         app_label = 'boards'
 
     tags = models.ManyToManyField('Tag')
     bump_time = models.DateTimeField(db_index=True)
     last_edit_time = models.DateTimeField()
     archived = models.BooleanField(default=False)
     bumpable = models.BooleanField(default=True)
     max_posts = models.IntegerField(default=get_thread_max_posts)
 
     def get_tags(self) -> QuerySet:
         """
         Gets a sorted tag list.
         """
 
         return self.tags.order_by('name')
 
     def bump(self):
         """
         Bumps (moves to up) thread if possible.
         """
 
         if self.can_bump():
             self.bump_time = self.last_edit_time
 
             self.update_bump_status()
 
             logger.info('Bumped thread %d' % self.id)
 
     def has_post_limit(self) -> bool:
         return self.max_posts > 0
 
     def update_bump_status(self, exclude_posts=None):
         if self.has_post_limit() and self.get_reply_count() >= self.max_posts:
             self.bumpable = False
             self.update_posts_time(exclude_posts=exclude_posts)
 
     def _get_cache_key(self):
         return [datetime_to_epoch(self.last_edit_time)]
 
     @cached_result(key_method=_get_cache_key)
     def get_reply_count(self) -> int:
         return self.get_replies().count()
 
     @cached_result(key_method=_get_cache_key)
     def get_images_count(self) -> int:
         return self.get_replies().annotate(images_count=Count(
             'images')).aggregate(Sum('images_count'))['images_count__sum']
 
     def can_bump(self) -> bool:
         """
         Checks if the thread can be bumped by replying to it.
         """
 
         return self.bumpable and not self.archived
 
     def get_last_replies(self) -> QuerySet:
         """
         Gets several last replies, not including opening post
         """
 
         last_replies_count = settings.get_int('View', 'LastRepliesCount')
 
         if last_replies_count > 0:
             reply_count = self.get_reply_count()
 
             if reply_count > 0:
                 reply_count_to_show = min(last_replies_count,
                                           reply_count - 1)
                 replies = self.get_replies()
                 last_replies = replies[reply_count - reply_count_to_show:]
 
                 return last_replies
 
     def get_skipped_replies_count(self) -> int:
         """
         Gets number of posts between opening post and last replies.
         """
         reply_count = self.get_reply_count()
         last_replies_count = min(settings.get_int('View', 'LastRepliesCount'),
                                  reply_count - 1)
         return reply_count - last_replies_count - 1
 
     def get_replies(self, view_fields_only=False) -> QuerySet:
         """
         Gets sorted thread posts
         """
 
         query = Post.objects.filter(threads__in=[self])
         query = query.order_by('pub_time').prefetch_related('images', 'thread', 'threads')
         if view_fields_only:
             query = query.defer('poster_ip')
         return query.all()
 
     def get_top_level_replies(self) -> QuerySet:
         return self.get_replies().exclude(refposts__threads__in=[self])
 
     def get_replies_with_images(self, view_fields_only=False) -> QuerySet:
         """
         Gets replies that have at least one image attached
         """
 
         return self.get_replies(view_fields_only).annotate(images_count=Count(
             'images')).filter(images_count__gt=0)
 
     def get_opening_post(self, only_id=False) -> Post:
         """
         Gets the first post of the thread
         """
 
         query = self.get_replies().order_by('pub_time')
         if only_id:
             query = query.only('id')
         opening_post = query.first()
 
         return opening_post
 
     @cached_result()
     def get_opening_post_id(self) -> int:
         """
         Gets ID of the first thread post.
         """
 
         return self.get_opening_post(only_id=True).id
 
     def get_pub_time(self):
         """
         Gets opening post's pub time because thread does not have its own one.
         """
 
         return self.get_opening_post().pub_time
 
-    def delete(self, using=None):
-        """
-        Deletes thread with all replies.
-        """
-
-        for reply in self.get_replies().all():
-            reply.delete()
-
-        super(Thread, self).delete(using)
-
     def __str__(self):
         return 'T#{}/{}'.format(self.id, self.get_opening_post_id())
 
     def get_tag_url_list(self) -> list:
         return boards.models.Tag.objects.get_tag_url_list(self.get_tags())
 
     def update_posts_time(self, exclude_posts=None):
         last_edit_time = self.last_edit_time
 
         for post in self.post_set.all():
             if exclude_posts is None or post not in exclude_posts:
                 # Manual update is required because uids are generated on save
                 post.last_edit_time = last_edit_time
                 post.save(update_fields=['last_edit_time'])
 
                 post.get_threads().update(last_edit_time=last_edit_time)
 
     def notify_clients(self):
         if not settings.get_bool('External', 'WebsocketsEnabled'):
             return
 
         client = Client()
 
         channel_name = WS_CHANNEL_THREAD + str(self.get_opening_post_id())
         client.publish(channel_name, {
             WS_NOTIFICATION_TYPE: WS_NOTIFICATION_TYPE_NEW_POST,
             })
         client.send()
 
     def get_absolute_url(self):
         return self.get_opening_post().get_absolute_url()