django forms - overriding constructor for changing field type depending by input

[luke lukes]

hi everyone. i need to overrid the constructor of a form: if i have some value in input, some fields has to be ChoiceField, otherwise they have to be CharField. here's the code:

http://dpaste.com/750343/

but this way doesn't work. even if i declare fields before constructor  as CharField and then I ovverride them in __init__, they will not be renderized in template (I got this message: <django.forms.fields.ChoiceField object at 0x7ff0c0173ad0>).I don't understand where's the mistake (also because i have poor python skills...)

any help?

[Mario Gudelj]

Hey Luke,

I don't think you need to return anything, especially not a super class.

Try this http://dpaste.com/hold/750356/

Cheers,

-m

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[luke lukes]

Hi. already tried this way --> fields are instantiated (<django.forms.fields.ChoiceField object at 0x7f6204206f10>) but are not rendered in the template...

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[luke lukes]

[Daniel Roseman]

On Sunday, 20 May 2012 12:49:28 UTC+1, luke lukes wrote:

Hi. already tried this way --> fields are instantiated (<django.forms.fields.ChoiceField object at 0x7f6204206f10>) but are not rendered in the template...

You should be assigning your new fields to `self.fields['fieldname']`, not `self.fieldname`.

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DR. 

[Paul Prior]

I think you need self.fields[field_name] = your new field.

Paul

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[luke lukes]

thanks Paul and DR, your solution worked. anyway now i have a problem with the validation of that form (her's the view):

def anagrafica_save(request):

    if request.method == 'POST':

        form = AnagraficaForm(request.POST)

        if'idsogg' in request.POST:

            soggetto = Anagrafica.objects.get(pk=request.POST["idsogg"])

        else:

            soggetto = Anagrafica()

        

        if form.is_valid():

   .... #set model fields and save

   ...

else:

   print('errors',form.errors)

            sub = "Scheda soggetto anagrafica"

            dict = {'sub':sub, 'subsogg':soggetto, 'form':form}

            return render_to_response('anagrafica_form.html', dict, context_instance=RequestContext(request))

The form is always not valid, also the form.errors print show an empty dict. The form is returned back and instead of renderized ChoiceFields as select, i got these messages printed in html: <django.forms.fields.ChoiceField object at 0x7ff264215110>...any help?

[bruno desthuilliers]

On May 20, 5:28 pm, luke lukes <lordluk...@gmail.com> wrote:
> thanks Paul and DR, your solution worked. anyway now i have a problem with
> the validation of that form (her's the view):

(snip)

Sorry, your code's indentation get messed up so it's hard to tell
where the problem ise exactly. Please post a link to dpaste or
something similar...

Oh and yes, just in case : wrt/ the form, Paul and Daniel are right
about the assignment to self.fields[fieldname], but you also need to
call the parent's __init__ before.