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annotate potd/models.py @ 628:c6292e46e617

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author Brian Neal <bgneal@gmail.com>
date Mon, 12 Nov 2012 16:40:54 -0600
parents ee87ea74d46b
children 2d35e5f97a99
rev   line source
gremmie@1 1 """
gremmie@1 2 Models for the Photo Of The Day (POTD) application.
bgneal@515 3
gremmie@1 4 """
bgneal@535 5 import datetime
gremmie@1 6 import os
gremmie@1 7 from PIL import ImageFile
gremmie@1 8 from PIL import Image
gremmie@1 9 try:
gremmie@1 10 from cStringIO import StringIO
gremmie@1 11 except:
gremmie@1 12 from StringIO import StringIO
gremmie@1 13
gremmie@1 14 from django.db import models
gremmie@1 15 from django.contrib.auth.models import User
gremmie@1 16 from django.core.files.base import ContentFile
gremmie@1 17
gremmie@1 18 POTD_THUMB_WIDTH = 120
gremmie@1 19
gremmie@1 20 def scale_image(image):
gremmie@1 21 (w, h) = image.size
gremmie@1 22 if w <= POTD_THUMB_WIDTH:
gremmie@1 23 return image
gremmie@1 24 scale_factor = float(POTD_THUMB_WIDTH) / w
gremmie@1 25 new_height = int(scale_factor * h)
gremmie@1 26 return image.resize((POTD_THUMB_WIDTH, new_height), Image.ANTIALIAS)
gremmie@1 27
gremmie@1 28
gremmie@1 29 class Photo(models.Model):
gremmie@1 30 """Model to represent a POTD"""
gremmie@1 31 photo = models.ImageField(upload_to='potd/%Y/%m/%d')
gremmie@1 32 thumb = models.ImageField(upload_to='potd/%Y/%m/%d/thumbs', blank=True, null=True)
gremmie@1 33 caption = models.CharField(max_length=128)
gremmie@1 34 description = models.TextField()
gremmie@1 35 user = models.ForeignKey(User)
bgneal@535 36 date_added = models.DateField()
gremmie@1 37 potd_count = models.IntegerField(default=0)
gremmie@1 38
bgneal@14 39 class Meta:
bgneal@14 40 ordering = ('-date_added', '-caption')
bgneal@14 41
gremmie@1 42 def __unicode__(self):
gremmie@1 43 return u'%s (%s)' % (self.caption, self.pk)
gremmie@1 44
bgneal@14 45 @models.permalink
bgneal@14 46 def get_absolute_url(self):
bgneal@14 47 return ('potd-archive', [str(self.id)])
gremmie@1 48
bgneal@182 49 def save(self, *args, **kwargs):
bgneal@330 50 if not self.pk:
bgneal@330 51 self.generate_thumb()
bgneal@535 52 self.date_added = datetime.datetime.now()
gremmie@1 53
bgneal@330 54 super(Photo, self).save(*args, **kwargs)
bgneal@330 55
bgneal@330 56 def can_comment_on(self):
bgneal@330 57 return Current.objects.get_current_id() == self.id
bgneal@330 58
bgneal@330 59 def generate_thumb(self):
gremmie@1 60 if self.thumb:
gremmie@1 61 self.thumb.delete(save=False)
gremmie@1 62
gremmie@1 63 parser = ImageFile.Parser()
gremmie@1 64 for chunk in self.photo.chunks():
gremmie@1 65 parser.feed(chunk)
gremmie@1 66 image = parser.close()
gremmie@1 67 format = image.format
gremmie@1 68 image = scale_image(image)
gremmie@1 69 s = StringIO()
gremmie@1 70 image.save(s, format)
gremmie@1 71 thumb_name = os.path.basename(self.photo.path)
gremmie@1 72 self.thumb.save(thumb_name, ContentFile(s.getvalue()), save=False)
gremmie@1 73
bgneal@491 74 def ogp_tags(self):
bgneal@491 75 """
bgneal@491 76 Returns a dict of Open Graph Protocol meta tags.
bgneal@491 77
bgneal@491 78 """
bgneal@491 79 desc = "Photo of the day: %s." % self.caption
bgneal@491 80 return {
bgneal@491 81 'og:title': self.caption,
bgneal@491 82 'og:type': 'article',
bgneal@491 83 'og:url': self.get_absolute_url(),
bgneal@491 84 'og:image': self.photo.url,
bgneal@491 85 'og:description': desc,
bgneal@491 86 }
bgneal@491 87
gremmie@1 88
gremmie@1 89 class CurrentManager(models.Manager):
bgneal@515 90 """
bgneal@515 91 Manager for the Current model.
bgneal@515 92
bgneal@515 93 """
gremmie@1 94 def get_current_photo(self):
bgneal@515 95 """
bgneal@515 96 Retrieves the current photo object from the current record.
bgneal@515 97
bgneal@515 98 """
gremmie@1 99 try:
gremmie@1 100 c = self.get(pk=1)
gremmie@1 101 return c.potd
gremmie@1 102 except Current.DoesNotExist:
gremmie@1 103 return None
gremmie@1 104
gremmie@1 105 def get_current_id(self):
bgneal@515 106 """
bgneal@515 107 Returns the ID of the current POTD from the current record.
bgneal@515 108
bgneal@515 109 """
gremmie@1 110 potd = self.get_current_photo()
gremmie@1 111 if potd is not None:
gremmie@1 112 return potd.pk
gremmie@1 113 return None
gremmie@1 114
gremmie@1 115
gremmie@1 116 class Current(models.Model):
gremmie@1 117 """This model simply stores the current POTD."""
gremmie@1 118 potd = models.ForeignKey(Photo)
gremmie@1 119
gremmie@1 120 objects = CurrentManager()
gremmie@1 121
gremmie@1 122 def __unicode__(self):
gremmie@1 123 return self.potd.__unicode__()
gremmie@1 124
gremmie@1 125 class Meta:
gremmie@1 126 verbose_name_plural = 'Current'
gremmie@1 127
gremmie@1 128
gremmie@1 129 class SequenceManager(models.Manager):
bgneal@515 130 """
bgneal@515 131 Manager for the Sequence model.
bgneal@515 132
bgneal@515 133 """
gremmie@1 134 def insert_photo(self, photo_id):
bgneal@515 135 """
bgneal@515 136 Inserts the given photo_id just after the current photo so it
bgneal@515 137 will appear as tomorrow's POTD.
bgneal@515 138
bgneal@515 139 """
gremmie@1 140 current = Current.objects.get_current_id()
gremmie@1 141 if current is not None:
bgneal@330 142 s = self.get(pk=1)
bgneal@330 143 seq = [int(x) for x in s.seq.split(',')]
bgneal@330 144 if photo_id not in seq:
bgneal@330 145 i = seq.index(current)
bgneal@330 146 seq.insert(i + 1, photo_id)
bgneal@330 147 s.seq = ','.join([str(x) for x in seq])
bgneal@330 148 s.save()
gremmie@1 149
gremmie@1 150 def remove_photo(self, photo_id):
bgneal@515 151 """
bgneal@515 152 Removes a given photo id from the sequence of photos.
bgneal@515 153
bgneal@515 154 """
gremmie@1 155 try:
gremmie@1 156 s = self.get(pk=1)
bgneal@330 157 except Sequence.DoesNotExist:
bgneal@330 158 pass
bgneal@330 159 else:
gremmie@1 160 seq = [int(x) for x in s.seq.split(',')]
gremmie@1 161 if photo_id in seq:
gremmie@1 162 seq.remove(photo_id)
gremmie@1 163 s.seq = ','.join([str(x) for x in seq])
gremmie@1 164 s.save()
gremmie@1 165
gremmie@1 166
gremmie@1 167 class Sequence(models.Model):
gremmie@1 168 """This model stores the sequence of photos for the POTD."""
gremmie@1 169 seq = models.CommaSeparatedIntegerField(max_length=4096)
gremmie@1 170
gremmie@1 171 objects = SequenceManager()
gremmie@1 172
gremmie@1 173 def __unicode__(self):
bgneal@535 174 return u'POTD Sequence %d' % self.id
gremmie@1 175
gremmie@1 176 class Meta:
gremmie@1 177 verbose_name_plural = 'Sequence'