Making expireable a abstract model

django_lostplaces/lostplaces/models/abstract_models.py

@@ -1,4 +1,5 @@
 
+from django.utils import timezone
 from django.db import models
 from django.core.validators import MaxValueValidator, MinValueValidator
 
@@ -55,7 +56,14 @@ class Submittable(models.Model):
 
 class Expireable(models.Model):
     """
-    Base class for things that can expire, i.e. VouchersAv
+    Base class for things that can expire, i.e. Vouchers
     """
+    class Meta:
+	    abstract = True
+        
     created_when = models.DateTimeField(auto_now_add=True)
-    expires_when = models.DateTimeField()
+    expires_when = models.DateTimeField()
+    
+    @property
+    def is_expired(self):
+        return timezone.now() > self.expires_when