+ Recursive search of suitable commission price & delivery price

store/models.py

@@ -85,10 +85,17 @@ class Category(MPTTModel):
     @property
     def delivery_price(self):
         if not self.delivery_price_CN_RU and self.parent_id:
-            return self.parent.delivery_price_CN_RU
+            return self.parent.delivery_price
         else:
             return self.delivery_price_CN_RU
 
+    @property
+    def commission_price(self):
+        if not self.commission and self.parent_id:
+            return self.parent.commission_price
+        else:
+            return self.commission
+
 
 class UserQuerySet(models.QuerySet):
     pass
@@ -474,7 +481,7 @@ class Checklist(models.Model):
 
         if self.category_id:
             # Add commission of bottom-most category
-            category_commission = getattr(self.category, 'commission', 0)
+            category_commission = getattr(self.category, 'commission_price', 0)
             commission = max(commission, category_commission * self.price_rub / 100)
 
         return commission