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from boards.models import Post
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__author__ = 'neko259'
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from django.db import models
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from django.db.models import Count
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TAG_FONT_MULTIPLIER = 0.1
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MAX_TAG_FONT = 10
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OPENING_POST_POPULARITY_WEIGHT = 2
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class TagManager(models.Manager):
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def get_not_empty_tags(self):
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tags = self.annotate(Count('threads')) \
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.filter(threads__count__gt=0).order_by('name')
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return tags
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class Tag(models.Model):
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"""
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A tag is a text node assigned to the post. The tag serves as a board
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section. There can be multiple tags for each message
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"""
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objects = TagManager()
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class Meta:
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app_label = 'boards'
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name = models.CharField(max_length=100)
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threads = models.ManyToManyField('Post', null=True,
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blank=True, related_name='tag+')
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linked = models.ForeignKey('Tag', null=True, blank=True)
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def __unicode__(self):
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return self.name
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def is_empty(self):
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return self.get_post_count() == 0
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def get_post_count(self):
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return self.threads.count()
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def get_popularity(self):
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posts_with_tag = Post.objects.get_threads(tag=self)
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reply_count = 0
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for post in posts_with_tag:
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reply_count += post.get_reply_count()
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reply_count += OPENING_POST_POPULARITY_WEIGHT
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return reply_count
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def get_linked_tags(self):
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tag_list = []
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self.get_linked_tags_list(tag_list)
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return tag_list
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def get_linked_tags_list(self, tag_list=[]):
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"""
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Returns the list of tags linked to current. The list can be got
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through returned value or tag_list parameter
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"""
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linked_tag = self.linked
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if linked_tag and not (linked_tag in tag_list):
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tag_list.append(linked_tag)
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linked_tag.get_linked_tags_list(tag_list)
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def get_font_value(self):
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"""Get tag font value to differ most popular tags in the list"""
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post_count = self.get_post_count()
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if post_count > MAX_TAG_FONT:
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post_count = MAX_TAG_FONT
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font_value = str(1 + (post_count - 1) * TAG_FONT_MULTIPLIER)
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return font_value
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