Added models for offers

oscar/offer/models.py

 from django.db import models
 from django.utils.translation import ugettext as _
 
+class ConditionalOffer(models.Model):
+    name = models.CharField(max_length=128)
+    description = models.TextField(blank=True)
+    condition = models.ForeignKey('offer.Condition')
+    benefit = models.ForeignKey('offer.Benefit')
+    start_date = models.DateField()
+    # Offers can be open-ended
+    end_date = models.DateField(blank=True)
+    priority = models.IntegerField()
+    created_date = models.DateTimeField(auto_now_add=True)
+
+class Condition(models.Model):
+    COUNT, VALUE = ("Count", "Value")
+    TYPE_CHOICES = (
+        (COUNT, _("Depends on number of items in basket that are in condition range")),
+        (VALUE, _("Depends on value of items in basket that are in condition range")),
+    )
+    range = models.ForeignKey('offer.Range')
+    type = models.CharField(max_length=128, choices=TYPE_CHOICES)
+    value = models.FloatField()
+
+class Benefit(models.Model):
+    PERCENTAGE, FIXED = ("Percentage", "Absolute")
+    TYPE_CHOICES = (
+        (PERCENTAGE, _("Discount is a % of the product's value")),
+        (FIXED, _("Discount is a fixed amount off the product's value")),
+    )
+    range = models.ForeignKey('offer.Range')
+    type = models.CharField(max_length=128, choices=TYPE_CHOICES)
+    value = models.FloatField()
+
+class Range(models.Model):
+    name = models.CharField(max_length=128)
+
 class Voucher(models.Model):
+    """
+    A voucher
+    """
     code = models.CharField(max_length=128)
     start_date = models.DateField()
     end_date = models.DateField()
+    offers = models.ManyToManyField('offer.ConditionalOffer')
     created_date = models.DateTimeField(auto_now_add=True)

oscar/product/models.py

     def __unicode__(self):
         return self.name
 
+
 class AttributeTypeMembership(models.Model):
     RELATIONSHIP_CHOICES = (
         ('optional', 'optional'),
 
         return 0 == len(required_attribute_names)
 
+
 class Attribute(models.Model):
     """An individual product attribute"""
     attribute_type = models.ForeignKey('product.AttributeType')

settings.py

     'oscar.payment',
     'oscar.order',
     'oscar.product',
+    'oscar.basket',
+    'oscar.offer',
 )
 
 # Local overrides