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1 """
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2 Models for the banners application.
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3
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4 """
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5 import datetime
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6
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7 from django.db import models
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8
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9
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10 class Campaign(models.Model):
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11 """
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12 A model to represent an ad or banner campaign.
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13
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14 """
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15 name = models.CharField(max_length=128)
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16 slug = models.SlugField()
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17 creation_date = models.DateTimeField(blank=True)
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18
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19 def __unicode__(self):
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20 return self.name
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21
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22 class Meta:
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23 ordering = ['name']
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24
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25 def save(self, *args, **kwargs):
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26 if not self.pk and not self.creation_date:
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27 self.creation_date = datetime.datetime.now()
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28
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29 super(Campaign, self).save(*args, **kwargs)
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30
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31
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32 def banner_upload_to(instance, filename):
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33 """
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34 An "upload_to" function for the Banner model.
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35
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36 """
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37 return "banners/%s/%s" % (instance.campaign.slug, filename)
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38
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39
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40 class Banner(models.Model):
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41 """
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42 A model to represent a banner.
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43
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44 """
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45 campaign = models.ForeignKey(Campaign)
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46 image = models.ImageField(upload_to=banner_upload_to)
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47 description = models.CharField(max_length=128)
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48 creation_date = models.DateTimeField(blank=True)
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49
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50 def __unicode__(self):
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51 return self.description
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52
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53 class Meta:
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54 ordering = ['-creation_date']
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55
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56 def save(self, *args, **kwargs):
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57 if not self.pk and not self.creation_date:
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58 self.creation_date = datetime.datetime.now()
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59
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60 super(Banner, self).save(*args, **kwargs)
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