import hashlib from django.template.loader import render_to_string from django.db import models from django.db.models import Count from django.core.urlresolvers import reverse from boards.models.base import Viewable from boards.utils import cached_result import boards __author__ = 'neko259' RELATED_TAGS_COUNT = 5 class TagManager(models.Manager): def get_not_empty_tags(self): """ Gets tags that have non-archived threads. """ return self.annotate(num_threads=Count('thread_tags')).filter(num_threads__gt=0)\ .order_by('-required', 'name') def get_tag_url_list(self, tags: list) -> str: """ Gets a comma-separated list of tag links. """ return ', '.join([tag.get_view() for tag in tags]) class Tag(models.Model, Viewable): """ A tag is a text node assigned to the thread. The tag serves as a board section. There can be multiple tags for each thread """ objects = TagManager() class Meta: app_label = 'boards' ordering = ('name',) name = models.CharField(max_length=100, db_index=True, unique=True) required = models.BooleanField(default=False, db_index=True) description = models.TextField(blank=True) parent = models.ForeignKey('Tag', null=True, related_name='children') def __str__(self): return self.name def is_empty(self) -> bool: """ Checks if the tag has some threads. """ return self.get_thread_count() == 0 def get_thread_count(self, archived=None) -> int: threads = self.get_threads() if archived is not None: threads = threads.filter(archived=archived) return threads.count() def get_active_thread_count(self) -> int: return self.get_thread_count(archived=False) def get_archived_thread_count(self) -> int: return self.get_thread_count(archived=True) def get_absolute_url(self): return reverse('tag', kwargs={'tag_name': self.name}) def get_threads(self): return self.thread_tags.order_by('-bump_time') def is_required(self): return self.required def get_view(self): link = '{}'.format( self.get_absolute_url(), self.name) if self.is_required(): link = '{}'.format(link) return link def get_search_view(self, *args, **kwargs): return render_to_string('boards/tag.html', { 'tag': self, }) @cached_result() def get_post_count(self): return self.get_threads().aggregate(num_posts=Count('multi_replies'))['num_posts'] def get_description(self): return self.description def get_random_image_post(self, archived=False): posts = boards.models.Post.objects.annotate(images_count=Count( 'images')).filter(images_count__gt=0, threads__tags__in=[self]) if archived is not None: posts = posts.filter(thread__archived=archived) return posts.order_by('?').first() def get_first_letter(self): return self.name and self.name[0] or '' def get_related_tags(self): return set(Tag.objects.filter(thread_tags__in=self.get_threads()).exclude( id=self.id).order_by('?')[:RELATED_TAGS_COUNT]) @cached_result() def get_color(self): """ Gets color hashed from the tag name. """ return hashlib.md5(self.name.encode()).hexdigest()[:6] def get_parent(self): return self.parent def get_all_parents(self): parents = list() parent = self.get_parent() if parent and parent not in parents: parents.insert(0, parent) parents = parent.get_all_parents() + parents return parents def get_children(self): return self.children