Thanks for answer. When I in request object I send id of premises it works
fine.
Request which led to error contained only id of order and one additional
field.
W dniu poniedziałek, 18 maja 2020 23:48:17 UTC+2 użytkownik Xavier Ordoquy
napisał:
>
> You probably have a queryset somewhere that is evaluated with the print
> and isn’t without.
> Point is, it may delay synchronous DB requests in an asynchronous code
> which would raise the error.
>
> Regards,
> Xavier O.
> Le 18 mai 2020 à 22:47 +0200, sebastian wrzalek <stia...@gmail.com
> <javascript:>>, a écrit :
>
> Hello,
> I have found very strange behaviour.
> In my app I have one serializer for partial update and one for data with
> nested representations.
> This block of code:
> @database_sync_to_async
> def _update_order(self, content):
> instance = Order.objects.get(id=content.get('id'))
> serializer = UpdateOrderSerializer(data=content, partial=True)
> serializer.is_valid(raise_exception=True)
> order = serializer.update(instance, serializer.validated_data)
> #if u remove print u get an error ???
> print(order)
> return order
>
> Couses error
>
>
> 1. app_1 | Exception inside application: You cannot call this from an
> async context - use a thread or sync_to_async.
> 2. app_1 | Traceback (most recent call last):
> 3. app_1 | File
>
> "/usr/local/lib/python3.7/site-packages/django/db/models/fields/related_descriptors.py"
> , line 172, in __get__
> 4. app_1 | rel_obj = self.field.get_cached_value(instance)
> 5. app_1 | File
> "/usr/local/lib/python3.7/site-packages/django/db/models/fields/mixins.py"
> , line 13, in get_cached_value
> 6. app_1 | return instance._state.fields_cache[cache_name]
> 7. app_1 | KeyError: 'premises'
>
>
> But when I uncomment print(order)
> Evertything as it should.
> I have no idea why if u know im looking forward to hear.
>
> Full code:
> https://github.com/swrzalek/onboard/blob/master/app/orders/consumers.py
>
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