forum/models/tag.py

   1 import datetime
   2 from base import *
   3
   4 from django.utils.translation import ugettext as _
   5 import django.dispatch
   6
   7 class ActiveTagManager(models.Manager):
   8     def get_query_set(self):
   9         return super(ActiveTagManager, self).get_query_set().exclude(used_count__lt=1)
  10
  11
  12 class Tag(BaseModel):
  13     name            = models.CharField(max_length=255, unique=True)
  14     created_by      = models.ForeignKey(User, related_name='created_tags')
  15     created_at      = models.DateTimeField(default=datetime.datetime.now, blank=True, null=True)
  16     marked_by       = models.ManyToManyField(User, related_name="marked_tags", through="MarkedTag")
  17     # Denormalised data
  18     used_count = models.PositiveIntegerField(default=0)
  19
  20     active = ActiveTagManager()
  21
  22     class Meta:
  23         ordering = ('-used_count', 'name')
  24         app_label = 'forum'
  25
  26     def __unicode__(self):
  27         return u'%s' % self.name
  28
  29     def add_to_usage_count(self, value):
  30         if self.used_count + value < 0:
  31             self.used_count = 0
  32         else:
  33             self.used_count = models.F('used_count') + value
  34
  35     @models.permalink
  36     def get_absolute_url(self):
  37         return ('tag_questions', (), {'tag': self.name})
  38
  39 class MarkedTag(models.Model):
  40     TAG_MARK_REASONS = (('good', _('interesting')), ('bad', _('ignored')))
  41     tag = models.ForeignKey(Tag, related_name='user_selections')
  42     user = models.ForeignKey(User, related_name='tag_selections')
  43     reason = models.CharField(max_length=16, choices=TAG_MARK_REASONS)
  44
  45     class Meta:
  46         app_label = 'forum'
  47