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1 """
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2 Models for the contest application.
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3
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4 """
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5 import random
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6 import datetime
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7
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8 from django.db import models
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9 from django.contrib.auth.models import User
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10
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11
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12 class PublicContestManager(models.Manager):
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13 """
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14 The manager for all public contests.
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15
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16 """
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17 def get_query_set(self):
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18 return super(PublicContestManager, self).get_query_set().filter(is_public=True)
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19
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20
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21 class Contest(models.Model):
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22 """
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23 A model to represent contests where users sign up to win something.
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24
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25 """
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26 title = models.CharField(max_length=64)
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27 slug = models.SlugField(max_length=64)
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28 description = models.TextField()
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29 is_public = models.BooleanField(db_index=True)
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30 creation_date = models.DateTimeField(blank=True)
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31 end_date = models.DateTimeField()
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32 contestants = models.ManyToManyField(User, related_name='contests',
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33 null=True, blank=True)
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34 winner = models.ForeignKey(User, null=True, blank=True,
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35 related_name='winning_contests')
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36 win_date = models.DateTimeField(null=True, blank=True)
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37 meta_description = models.TextField()
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38
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39 objects = models.Manager()
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40 public_objects = PublicContestManager()
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41
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42 class Meta:
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43 ordering = ['-creation_date']
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44
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45 def __unicode__(self):
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46 return self.title
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47
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48 @models.permalink
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49 def get_absolute_url(self):
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50 return ('contests-contest', [], {'slug': self.slug})
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51
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52 def save(self, *args, **kwargs):
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53 if not self.pk and not self.creation_date:
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54 self.creation_date = datetime.datetime.now()
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55
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56 super(Contest, self).save(*args, **kwargs)
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57
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58 def is_active(self):
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59 """
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60 Returns True if the contest is still active.
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61
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62 """
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63 now = datetime.datetime.now()
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64 return self.creation_date <= now < self.end_date
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65
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66 def can_enter(self):
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67 """
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68 Returns True if the contest is still active and does not have a winner.
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69
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70 """
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71 return not self.winner and self.is_active()
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72
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73 def pick_winner(self):
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74 """
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75 This function randomly picks a winner from all the contestants.
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76
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77 """
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78 user_ids = self.contestants.values_list('id', flat=True)
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79 winner_id = random.choice(user_ids)
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80 self.winner = User.objects.get(id=winner_id)
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81 self.win_date = datetime.datetime.now()
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82
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83 def ogp_tags(self):
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84 """
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85 Returns a dict of Open Graph Protocol meta tags.
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86
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87 """
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88 return {
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89 'og:title': self.title,
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90 'og:type': 'article',
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91 'og:url': self.get_absolute_url(),
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92 'og:description': self.meta_description,
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93 }
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