diff --git a/app/models.py b/app/models.py
index 5bec32f..9db3526 100644
--- a/app/models.py
+++ b/app/models.py
@@ -110,6 +110,12 @@ class Order(db.Model):
 
         return group
 
+    def len(self):
+        size = 0
+        for _ in self.items:
+            size = size + 1
+        return size
+
     def group_by_product(self):
         group = dict()
         for item in self.items:
diff --git a/app/templates/order.html b/app/templates/order.html
index a0064b2..4ee0619 100644
--- a/app/templates/order.html
+++ b/app/templates/order.html
@@ -78,7 +78,7 @@
         </table>
     </div>
     <div class="col-md-push-2 col-md-4 darker" id="items-ordered">
-        <h3>Ordered products: {% len(order.items) %}</h3>
+        <h3>Ordered products: {{ order.len() }}</h3>
         {% for key, value in order.group_by_product().items() -%}
             <div class="product">
                 {{ key }}: {{ value["count"] }}