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import logging
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from django.db.models import Count, Sum
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from django.utils import timezone
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from django.db import models
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from boards import settings
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from boards.utils import cached_result
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from boards.models.post import Post
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__author__ = 'neko259'
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logger = logging.getLogger(__name__)
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class ThreadManager(models.Manager):
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def process_oldest_threads(self):
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"""
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Preserves maximum thread count. If there are too many threads,
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archive or delete the old ones.
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"""
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threads = Thread.objects.filter(archived=False).order_by('-bump_time')
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thread_count = threads.count()
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if thread_count > settings.MAX_THREAD_COUNT:
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num_threads_to_delete = thread_count - settings.MAX_THREAD_COUNT
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old_threads = threads[thread_count - num_threads_to_delete:]
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for thread in old_threads:
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if settings.ARCHIVE_THREADS:
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self._archive_thread(thread)
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else:
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thread.delete()
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logger.info('Processed %d old threads' % num_threads_to_delete)
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def _archive_thread(self, thread):
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thread.archived = True
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thread.bumpable = False
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thread.last_edit_time = timezone.now()
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thread.save(update_fields=['archived', 'last_edit_time', 'bumpable'])
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class Thread(models.Model):
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objects = ThreadManager()
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class Meta:
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app_label = 'boards'
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tags = models.ManyToManyField('Tag')
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bump_time = models.DateTimeField()
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last_edit_time = models.DateTimeField()
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archived = models.BooleanField(default=False)
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bumpable = models.BooleanField(default=True)
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def get_tags(self):
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"""
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Gets a sorted tag list.
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"""
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return self.tags.order_by('name')
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def bump(self):
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"""
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Bumps (moves to up) thread if possible.
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"""
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if self.can_bump():
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self.bump_time = timezone.now()
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if self.get_reply_count() >= settings.MAX_POSTS_PER_THREAD:
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self.bumpable = False
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logger.info('Bumped thread %d' % self.id)
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def get_reply_count(self):
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return self.get_replies().count()
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def get_images_count(self):
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return self.get_replies().annotate(images_count=Count(
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'images')).aggregate(Sum('images_count'))['images_count__sum']
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def can_bump(self):
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"""
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Checks if the thread can be bumped by replying to it.
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"""
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return self.bumpable
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def get_last_replies(self):
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"""
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Gets several last replies, not including opening post
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"""
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if settings.LAST_REPLIES_COUNT > 0:
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reply_count = self.get_reply_count()
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if reply_count > 0:
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reply_count_to_show = min(settings.LAST_REPLIES_COUNT,
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reply_count - 1)
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replies = self.get_replies()
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last_replies = replies[reply_count - reply_count_to_show:]
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return last_replies
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def get_skipped_replies_count(self):
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"""
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Gets number of posts between opening post and last replies.
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"""
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reply_count = self.get_reply_count()
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last_replies_count = min(settings.LAST_REPLIES_COUNT,
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reply_count - 1)
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return reply_count - last_replies_count - 1
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def get_replies(self, view_fields_only=False):
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"""
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Gets sorted thread posts
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"""
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query = Post.objects.filter(thread_new=self)
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query = query.order_by('pub_time').prefetch_related('images')
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if view_fields_only:
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query = query.defer('poster_user_agent')
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return query.all()
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def get_replies_with_images(self, view_fields_only=False):
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"""
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Gets replies that have at least one image attached
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"""
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return self.get_replies(view_fields_only).annotate(images_count=Count(
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'images')).filter(images_count__gt=0)
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def add_tag(self, tag):
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"""
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Connects thread to a tag and tag to a thread
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"""
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self.tags.add(tag)
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def get_opening_post(self, only_id=False):
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"""
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Gets the first post of the thread
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"""
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query = self.get_replies().order_by('pub_time')
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if only_id:
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query = query.only('id')
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opening_post = query.first()
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return opening_post
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@cached_result
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def get_opening_post_id(self):
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"""
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Gets ID of the first thread post.
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"""
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return self.get_opening_post(only_id=True).id
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def __unicode__(self):
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return str(self.id)
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def get_pub_time(self):
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"""
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Gets opening post's pub time because thread does not have its own one.
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"""
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return self.get_opening_post().pub_time
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def delete(self, using=None):
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"""
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Deletes thread with all replies.
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"""
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for reply in self.replies.all():
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reply.delete()
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super(Thread, self).delete(using)
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def __str__(self):
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return 'T#{}/{}'.format(self.id, self.get_opening_post_id())
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