diff --git a/core/graphene/object_types.py b/core/graphene/object_types.py
index ea9bad4e..c93c0aef 100644
--- a/core/graphene/object_types.py
+++ b/core/graphene/object_types.py
@@ -396,7 +396,7 @@ class ProductType(DjangoObjectType):
         filter_fields = ["uuid", "name"]
         description = _("products")
 
-    def resolve_price(self, _info) -> float:
+    def resolve_price(self: Product, _info) -> float:
         return self.price or 0.0
 
     def resolve_feedbacks(self: Product, _info):
@@ -404,7 +404,7 @@ class ProductType(DjangoObjectType):
             return Feedback.objects.filter(order_product__product=self)
         return Feedback.objects.filter(order_product__product=self, is_active=True)
 
-    def resolve_feedbacks_count(self, _info) -> int:
+    def resolve_feedbacks_count(self: Product, _info) -> int:
         return self.feedbacks_count or 0
 
     def resolve_attribute_groups(self: Product, info):
@@ -412,7 +412,7 @@ class ProductType(DjangoObjectType):
 
         return AttributeGroup.objects.filter(attributes__values__product=self).distinct()
 
-    def resolve_quantity(self, _info) -> int:
+    def resolve_quantity(self: Product, _info) -> int:
         return self.quantity or 0