added 'image' field to Product, uploaded images get scaled automatically (can be configured through THUMBNAIL_SIZE in settings.py)

cash/models.py

@@ -1,3 +1,5 @@
+
+from django.conf import settings
 from django.db import models
 from django.contrib.auth.models import User
 from django.db.models.signals import post_save
@@ -6,6 +8,7 @@ from django.dispatch import receiver
 from django_auth_ldap.backend import populate_user
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext_noop
+import PIL
 
 class Account(models.Model):
 	user = models.OneToOneField(User)
@@ -109,6 +112,8 @@ class Product(models.Model):
 	active = models.BooleanField(default = True, verbose_name = _('active'))
 	category = models.ForeignKey(ProductCategory, blank=True, null=True,
 	                             verbose_name = _('category'))
+	image = models.ImageField(upload_to="products", verbose_name = _('image'),
+	                          blank=True, null=True)
 
 	def __unicode__(self):
 		return self.name
@@ -117,6 +122,21 @@ class Product(models.Model):
 		verbose_name = _('product')
 		verbose_name_plural = _('products')
 
+@receiver(post_save, sender=Product)
+def product_post_save_handler(sender, instance, **kwargs):
+	img = instance.image
+	if img:
+		img.open(mode='r')
+		with img:
+			scaled = PIL.Image.open(img)
+			thumbnail_size = getattr(settings, 'THUMBNAIL_SIZE', (150, 150))
+			scaled.thumbnail(thumbnail_size, PIL.Image.ANTIALIAS)
+
+		img.open(mode='w')
+		with img:
+			scaled.save(img)
+
+
 class ProductBarcode(models.Model):
 	barcode = models.CharField(max_length=32, unique=True,
 	                           verbose_name = _('barcode'))