On Jan 23, 7:19 am, bruno desthuilliers
<bruno.desthuilli...@gmail.com> wrote:
> On 23 jan, 06:29, waltbrad <waltb...@hotmail.com> wrote:
>
> > Hi folks. PersonForm is a modelform. I'm trying to validate data by
> > calling an instance of PersonForm. (This is from Sam's 24 hour, and
> > I've modified the example to accommodate the 1.0 changes.) So,
>
> NB : Alex already gave you the practical solution, but I thought a
> couple explanations migh help !-)
>
> > if request.method == 'POST':
> > if request.POST['submit'] == 'update':
> > message = 'Update Request for %s.' % p.name
> > pForm = PersonForm(instance=p)
>
> This creates an instance of the PersonForm class. If you don't know
> Python : Python's classes are objects, and the call operator is used
> for instanciation (no 'new' operator needed).
>
> > c=pForm(request.POST.copy())
>
> and this tries to call the PersonForm instance.
>
>
>
> > And I get the error alluded to in the Subject line.
>
> > The author has
> > something similar:
>
> > if request.method == 'POST':
> > if request.POST['submit'] == 'update':
> > message = 'Update Request for %s.' % p.name
> > PersonForm = forms.form_for_instance(p)
>
> This used to dynamically create a form *class* from the instance (and
> it's model of course).
>
> > f = PersonForm(request.POST.copy())
>
> And this was instanciating the form class.
>
> """
> Would you know off hand where in the documentation I
> could find that? I looked around but just couldn't find much on the
> request.POST.copy function or it's use in modelforms.
> """
>
> wrt/ passing both request.POST (or whatever other data mapping) and an
> instance, you'll find an example here:
>
> http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#the-sav...
>
> wrt/ the 'copy' method, it's documented
> here:http://docs.djangoproject.com/en/dev/ref/request-response/#id1
>
> Using request.POST.copy() instead of request.POST is advised whenever
> the callee might modify it's input (Python doesn't copy objects when
> they are passed to functions).
>
> HTH
thankyou, bruno. I know a bit about python. Not as much as I would
like. So, I'll be re-reading this post and the docs you site, till it
sinks in a bit.
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