best deal price fields added to product serialzier

backend/product/models.py

@@ -210,6 +210,9 @@ class ProductModel(models.Model):
         if not self.slug:
             self.slug = slugify(self.name, allow_unicode=True)
         super().save(*args, **kwargs)
+        
+    def get_best_deal_variant(self):
+        return self.variants.order_by("price", "-discount").first()
 
     class Meta:
         verbose_name = 'محصول'