Fix products not available for purchased anymore

shop/models.py

@@ -282,6 +282,16 @@ class Product(CreatedUpdatedModel, UUIDModel):
         now = timezone.now()
         return now in self.available_in
 
+    def is_old(self):
+        now = timezone.now()
+        if hasattr(self.available_in, 'upper') and self.available_in.upper:
+            return self.available_in.upper < now
+        return False
+
+    def is_upcoming(self):
+        now = timezone.now()
+        return self.available_in.lower >  now
+
 
 class OrderProductRelation(CreatedUpdatedModel):
     order = models.ForeignKey('shop.Order')

shop/templates/product_detail.html

@@ -40,8 +40,12 @@
     {% else %}
 
     <p>
+    {% if product.is_old %}
+      This product is not available anymore.
+    {% elif product.is_upcoming %}
       This product is available from
       {{ product.available_in.lower|date:"Y-m-d H:i T" }}
+    {% endif %}
     </p>
 
     {% endif %}