Django makes always (at least currently) full record update (iow: there is
no dirty flag for fields).
Example given is "poor" in the sense that it uses directly POST data. I
strongly would suggest leveraging modelforms when ever possible - it saves
time and nerves. You get all the validation and other goodies for free.
On Wed, Jul 11, 2012 at 8:09 PM, Dennis Lee Bieber <wlfr...@ix.netcom.com>wrote:
> On Wed, 11 Jul 2012 08:36:39 -0700 (PDT), JJ Zolper
> <codinga...@gmail.com> declaimed the following in
> gmane.comp.python.django.user:
>
>
> > So originally:
> >
> > selected_choice = p.choice_set.get(pk=request.POST['choice'])
> >
> If I understand this (I've not run the tutorial, and only browsed
> the now-outdated print books), this statement is using the value from
> the "choice" field of the submitted form as the primary key to retrieve
> a record (model instance) from the database.
>
> pseudo-SQL
> select * from choice_set where pk = "request.POST['choice']"
>
> > this requests the submitted choice from the POST data and
> >
> > The part that says:
> >
> > selected_choice.votes += 1
> > selected_choice.save()
> >
> > Actually saves the choice to the database?
> >
> This then increments the votes field of the record (model instance)
> retrieved from the database, and then saves the record back.
>
> p-SQL
> update choice_set set
> votes = votes + 1
> where pk = selected_choice.pk
>
> {I don't know if Django is smart enough to only update the changed
> field, or if it updates the entire record}
> --
> Wulfraed Dennis Lee Bieber AF6VN
> wlfr...@ix.netcom.com HTTP://wlfraed.home.netcom.com/
>
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--
Jani Tiainen
- Well planned is half done, and a half done has been sufficient before...
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