implemented __unicode__ for Account, ProductCategory, Product and ProductBarcode

cash/models.py

@@ -8,21 +8,33 @@ class Account(models.Model):
 	daily_digest = models.BooleanField()
 	credit = models.IntegerField()
 
+	def __unicode__(self):
+		return self.user.username
+
 class ProductCategory(models.Model):
 	name = models.CharField(max_length=32, unique=True)
 	comment = models.CharField(max_length=128, blank=True)
 
+	def __unicode__(self):
+		return "%s (%s)" % (self.name, self.comment)
+
 class Product(models.Model):
 	name = models.CharField(max_length=32, unique=True)
 	price = models.IntegerField()
 	deleted = models.BooleanField()
 	category = models.ForeignKey(ProductCategory, blank=True, null=True)
 
+	def __unicode__(self):
+		return self.name
+
 class ProductBarcode(models.Model):
 	barcode = models.CharField(max_length=32, unique=True)
 	comment = models.CharField(max_length=128)
 	product = models.ForeignKey(Product)
 
+	def __unicode__(self):
+		return self.barcode
+
 class Transaction(models.Model):
 	account = models.ForeignKey(Account)
 	timestamp = models.DateTimeField(auto_now_add=True)