mygpo/podcastlists/models.py

   1 from django.db import models
   2 from django.core.urlresolvers import reverse
   3 from django.conf import settings
   4 from django.contrib.contenttypes.models import ContentType
   5 from django.contrib.contenttypes import generic
   6
   7 from uuidfield import UUIDField
   8
   9 from mygpo.core.models import UpdateInfoModel, OrderedModel, UUIDModel
  10 from mygpo.podcasts.models import Podcast
  11 from mygpo.flattr import FlattrThing
  12 from mygpo.votes.models import VoteMixin
  13
  14
  15 class PodcastList(UUIDModel, VoteMixin):
  16     """ A user-curated collection of podcasts """
  17
  18     # the user that created (and owns) the list
  19     user = models.ForeignKey(settings.AUTH_USER_MODEL,
  20                              on_delete=models.CASCADE)
  21
  22     # the user-assigned title of the list
  23     title = models.CharField(max_length=512)
  24
  25     # the slug (unique for the user) that is derived from the title
  26     slug = models.SlugField(max_length=128)
  27
  28     # overwrites UpdateInfoModel.created/modified during the migration; this
  29     # can be removed after the migration, to use the shadowed field with
  30     # auto_add_now
  31     created = models.DateTimeField()
  32     modified = models.DateTimeField()
  33
  34     class Meta:
  35         unique_together = [
  36             # a slug is unique for a user
  37             ('user', 'slug'),
  38         ]
  39
  40     @property
  41     def max_order(self):
  42         return max([-1] + [e.order for e in self.entries.all()])
  43
  44     @property
  45     def num_entries(self):
  46         return self.entries.count()
  47
  48     def add_entry(self, obj):
  49         entry, created = PodcastListEntry.objects.get_or_create(
  50             podcastlist=podcastlist,
  51             content_type=ContentType.objects.get_for_model(obj),
  52             object_id=obj.id,
  53             defaults={
  54                 'order': self.max_order + 1,
  55             },
  56         )
  57
  58     def get_flattr_thing(self, domain, username):
  59         """ Returns a "Thing" which can be flattred by other Flattr users """
  60         return FlattrThing(
  61                 url = reverse('list-show', args=[username, self.slug]),
  62                 title = self.title,
  63                 description = u'A collection of podcasts about "%s" by %s user %s' % (self.title, domain, username),
  64                 category = u'audio',
  65                 hidden = None,
  66                 tags = None,
  67                 language = None,
  68             )
  69
  70
  71
  72 class PodcastListEntry(UpdateInfoModel, OrderedModel):
  73     """ An entry in a Podcast List """
  74
  75     # the list that the entry belongs to
  76     podcastlist = models.ForeignKey(PodcastList,
  77                                     related_name='entries',
  78                                     on_delete=models.CASCADE,
  79                                    )
  80
  81     # the object (Podcast or PodcastGroup) that is in the list
  82     content_type = models.ForeignKey(ContentType, on_delete=models.PROTECT)
  83     object_id = UUIDField()
  84     content_object = generic.GenericForeignKey('content_type', 'object_id')
  85
  86     class Meta:
  87         unique_together = [
  88             ('podcastlist', 'order'),
  89             ('podcastlist', 'content_type', 'object_id'),
  90         ]