add: add save method to Inventory model

core/apps/wherehouse/models/inventory.py

@@ -31,6 +31,11 @@ class Inventory(BaseModel):
 
     def __str__(self):
         return f'{self.product} in {self.wherehouse}'
+    
+    def save(self, *args, **kwargs):
+        if self.quantity == 0:
+            self.is_invalid = True
+        return super().save()
 
     class Meta:
         verbose_name = _('inventar')

core/apps/wherehouse/serializers/invalid_product.py

@@ -52,7 +52,6 @@ class InvalidProductCreateSerializer(serializers.Serializer):
                 wherehouse=validated_data.get('inventory').wherehouse
             )
             invalid_product.witnesses.set(witnesses_ids)
-            invalid_product.inventory.is_invalid = True
             invalid_product.inventory.quantity -= validated_data.get('amount')
             invalid_product.inventory.save()
             invalid_product.save()