Bien Le lun. 25 sept. 2023 à 17:44, Aivars Kalvāns <aivars.kalv...@gmail.com> a écrit :
> Hi! > > I want to implement these changes and I have a PR in the ticket > https://code.djangoproject.com/ticket/32406 > At the moment I have a new `update_returning` method but I can easily > replace it with ` (updates=None, *, returning:bool=None, **kwargs)` if you > decide to add functionality to the existing method instead. I did a search > on github and found only a single project with `returning` as model field. > However the returned value in my implementation is a `QuerySet` and I can > do `.get()`, `.only()`, `.defer()` and `.values()` or `.values_list()` on > that. Mainly because my use case is updating and refreshing the model in a > single database operation. The ticket has more examples. What do you think, > do you see any issues with this approach? > > trešdiena, 2021. gada 12. maijs 15:18:50 UTC+3 Tom Carrick rakstīja: > >> Apologies, I had totally forgotten about this, but I'm still interested >> in working on it, but still not sure about a few things. >> >> I've been thinking about the return value a bit. I can foresee cases >> where you wouldn't want the id returned. You might want the user to update >> something by slug, username, or some other identifier without revealing the >> IDs. Of course the user could reformat the return value however they like, >> but I don't see a reason to ask for something that isn't necessary. >> >> So I think a list of some kind of object (namedtuple or dict probably) >> makes the most sense to me. As for also adding the count, I am not sure. >> The return value would then be e.g. (1, [<data>]). I'm guessing this count >> would remain as the number of matched rows, rather than the updated ones - >> I am not sure if returning only gives back rows that were modified or not, >> the Postgres docs are at least unclear on this. If they're always going to >> be the same, I'm not sure there is much reason for returning the count when >> len(return_value) will do. >> >> I'm also not really sure on the data structure though. Namedtuples make >> the most sense to me but a dict might be useful for those wanting to shove >> this directly into JsonResponse, without needing _asdict(), for example. >> >> Cheers, >> Tom >> >> On Wed, 27 Jan 2021 at 10:45, Florian Apolloner <f.apo...@gmail.com> >> wrote: >> >>> Hi Simon, >>> >>> On Wednesday, January 27, 2021 at 5:54:42 AM UTC+1 charettes wrote: >>> >>>> I think that's the best option here if we want to elegantly add support >>>> for this feature while maintaining backward compability. Something along >>>> the lines of ... >>>> >>> >>> That is certainly an interesting approach. It kinda breaks the "there >>> should be one way of doing things" rule, but… >>> >>> The usage of `returning` bring another set of questions though. Since >>>> UPDATE are not ordered RETURNING data has little value without the primary >>>> key associated with the updated rows. Maybe the return value of >>>> `returning=[f1, ..., fn]` should be a dict mapping the primary key to list >>>> of returning values. >>>> >>> >>> I am not sure I like that. For things where you update just one row and >>> want to know the new values the primary key doesn't make much sense. >>> Granted for multiple rows it would maybe easier to have it automatically >>> keyed by the pk, but returning something always (the pk) without having an >>> option to disable it seems kinda wrong to me. Not sure what the best >>> option would be. >>> >>> Cheers, >>> Florian >>> >>> -- >>> >> You received this message because you are subscribed to the Google Groups >>> "Django developers (Contributions to Django itself)" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to django-develop...@googlegroups.com. >>> >> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/django-developers/4eea605a-57d7-4ce3-b233-3eb88c91e110n%40googlegroups.com >>> <https://groups.google.com/d/msgid/django-developers/4eea605a-57d7-4ce3-b233-3eb88c91e110n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "Django developers (Contributions to Django itself)" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-developers+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-developers/ee284d47-6181-426d-98fd-3a0e50e0d9abn%40googlegroups.com > <https://groups.google.com/d/msgid/django-developers/ee284d47-6181-426d-98fd-3a0e50e0d9abn%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Django developers (Contributions to Django itself)" group. 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