špatná reference

showroom/catalog/models.py

@@ -43,13 +43,13 @@ class Product(Page):
     content_panels = Page.content_panels + [
         FieldPanel('price'),
         FieldPanel('description', classname="full"),
-        InlinePanel('gallery_images', label="Obrázky"),
+        InlinePanel('product_images', label="Obrázky"),
     ]
 
 
 
 class ProductImage(Orderable):
-    page = ParentalKey(BlogPage, on_delete=models.CASCADE, related_name='product_images')
+    page = ParentalKey(Product, on_delete=models.CASCADE, related_name='product_images')
     image = models.ForeignKey(
         'wagtailimages.Image', on_delete=models.CASCADE, related_name='+'
     )