well, to me this is very common - I need to edit __init__ for about
50% of the forms I´ve used so far (and I´ve used quite a lot of
forms). I guess that a lot of people will be glad to have
"modelforms", but I doubt that they can be used in real-world-
applications. and ... it´s ok, if django doesn´t focus on solving
complex issues - but then it should be explained like this.
from the django mainpage:
"Django was designed to handle two challenges: the intensive deadlines
of a newsroom and the stringent requirements of the experienced Web
developers who wrote it. It lets you build high-performing, elegant
Web applications quickly."
I don´t think that´s true (anymore).
however, here´s the (quite ugly) working solution:
FORM
class BaseUploadFormSet(BaseFormSet):
def __init__(self, **kwargs):
self.path_server = kwargs['path_server']
self.path = kwargs['path']
del kwargs['path_server']
del kwargs['path']
super(BaseUploadFormSet, self).__init__(**kwargs)
def _construct_form(self, i, **kwargs):
kwargs["path_server"] = self.path_server
kwargs["path"] = self.path
return super(BaseUploadFormSet, self)._construct_form(i,
**kwargs)
class UploadForm(forms.Form):
def __init__(self, *args, **kwargs):
self.path_server = kwargs['path_server']
self.path = kwargs['path']
del kwargs['path_server']
del kwargs['path']
super(UploadForm, self).__init__(*args, **kwargs)
VIEW
UploadFormSet = formset_factory(UploadForm, formset=BaseUploadFormSet,
extra=5)
if request.method == 'POST':
formset = UploadFormSet(data=request.POST, files=request.FILES,
path_server=PATH_SERVER, path=path)
...
else:
formset = UploadFormSet(path_server=PATH_SERVER, path=path)
On Aug 21, 8:45 pm, "Justin Fagnani" <[EMAIL PROTECTED]> wrote:
> Looks like you're almost there. You fixed a couple of problems in the
> code I posted.
> Can you post more of the error so we know which __init__ is thowing
> the exception?
>
> I know it seems complicated, but I'd be surprised if this pattern was
> common. I doubt most Form subclasses require extra arguments to
> __init__(). A general way to do this might be nice, but could be very
> complicated.
>
> Another way to do this would be to create your formset, and then
> iterate over formset.forms and set the attributes you need, and then
> do what you need with the formset.
>
> -Justin
>
> On Thu, Aug 21, 2008 at 6:42 AM, patrickk <[EMAIL PROTECTED]> wrote:
>
> > hehe :-)
>
> > doesn´t work when data is posted:
>
> > if request.method == 'POST':
> > formset = UploadFormSet(path_server=PATH_SERVER, path=path,
> > request.POST, request.FILES)
>
> > error: __init__() got multiple values for keyword argument 'path'
>
> > On Aug 21, 2:55 pm, patrickk <[EMAIL PROTECTED]> wrote:
> >> got it - passing parameters to formsets. this is just my personal
> >> opinion, but in my view it´s overly complicated for such a common
> >> thing ... I thought newforms will make things easier (but that was
> >> about 4 weeks ago).
>
> >> class BaseUploadFormSet(BaseFormSet):
>
> >> def __init__(self, path_server=None, path=None, **kwargs):
> >> self.path_server = path_server
> >> self.path = path
> >> super(BaseUploadFormSet, self).__init__(**kwargs)
>
> >> def _construct_form(self, i, **kwargs):
> >> # this works because BaseFormSet._construct_form() passes
> >> **kwargs
> >> # to the form's __init__()
> >> kwargs["path_server"] = self.path_server
> >> kwargs["path"] = self.path
> >> return super(BaseUploadFormSet, self)._construct_form(i,
> >> **kwargs)
>
> >> class UploadForm(forms.Form):
>
> >> def __init__(self, path_server=None, path=None, *args, **kwargs):
> >> self.path_server = path_server
> >> self.path = path
> >> print self.path_server
> >> print self.path
> >> super(UploadForm, self).__init__(*args, **kwargs)
>
> >> ...
> >> define fields here
> >> ...
>
> >> On Aug 21, 2:30 pm, patrickk <[EMAIL PROTECTED]> wrote:
>
> >> > hmm, this is getting funny ...
>
> >> > def _construct_forms(self):
> >> > # instantiate all the forms and put them in self.forms
> >> > self.forms = []
> >> > for i in xrange(self._total_form_count):
> >> > self.forms.append(self._construct_form(i))
> >> > print self.forms
>
> >> > def _construct_form(self, i, **kwargs):
> >> > """
> >> > Instantiates and returns the i-th form instance in a formset.
> >> > """
> >> > defaults = {'auto_id': self.auto_id, 'prefix':
> >> > self.add_prefix(i)}
> >> > if self.data or self.files:
> >> > defaults['data'] = self.data
> >> > defaults['files'] = self.files
> >> > if self.initial:
> >> > try:
> >> > defaults['initial'] = self.initial[i]
> >> > except IndexError:
> >> > pass
> >> > # Allow extra forms to be empty.
> >> > if i >= self._initial_form_count:
> >> > defaults['empty_permitted'] = True
> >> > defaults.update(kwargs)
> >> > form = self.form(**defaults)
> >> > self.add_fields(form, i)
> >> > print form
> >> > return form
>
> >> > as you can see, I´ve inserted print in _construct_form and
> >> > _construct_forms. the print-statement at the end of _construct_form
> >> > displays the form, but the print-statement in _construct_forms
> >> > displays: [None, None, None, None, None].
>
> >> > On Aug 21, 1:36 pm, patrickk <[EMAIL PROTECTED]> wrote:
>
> >> > > to be more precise:
> >> > > when I do "print form" in formsets.py in line 96, at the end of
> >> > > _construct_form, the form is there.
> >> > > but when trying to display the form(s) in the template, the formset is
> >> > > empty ...
>
> >> > > On Aug 21, 12:19 pm, patrickk <[EMAIL PROTECTED]> wrote:
>
> >> > > > thanks justin.
>
> >> > > > I´m able to pass the paramters to the form now. unfortunately, the
> >> > > > form (in the template) is empty now ... no fields at all, so I guess
> >> > > > there´s something missing here (but I don´t know what).
>
> >> > > > On Aug 21, 11:34 am, "Justin Fagnani" <[EMAIL PROTECTED]>
> >> > > > wrote:
>
> >> > > > > On Thu, Aug 21, 2008 at 12:30 AM, patrickk <[EMAIL PROTECTED]>
> >> > > > > wrote:
>
> >> > > > > > I´m not sure (anymore) we´re all talking about the same issue.
>
> >> > > > > I think we are. I'll see if I can clarify... The broad idea is that
> >> > > > > you pass the parameters to the formset in your view via an
> >> > > > > overridden
> >> > > > > __init__(), then you pass them to the form via an overridden
> >> > > > > _construct_form().
>
> >> > > > > Something like this:
>
> >> > > > > class MyBaseFormSet(BaseFormSet):
> >> > > > > def __init__(self, foo=None, **kwargs):
> >> > > > > self.foo = foo
> >> > > > > super(BaseFormSet, self).__init__(**kwargs)
>
> >> > > > > def _construct_form(self, i, **kwargs):
> >> > > > > # this works because BaseFormSet._construct_form() passes
> >> > > > > **kwargs
> >> > > > > # to the form's __init__()
> >> > > > > super(BaseFormSet, self)._construct_form(i, **{'foo':
> >> > > > > self.foo})
>
> >> > > > > class MyForm(Form):
> >> > > > > def __init__(self, foo=None, *args, **kwargs):
> >> > > > > self.foo = foo
> >> > > > > super(BaseForm, self).__init__(*args, **kwargs)
>
> >> > > > > MyFormSet = formset_factory(MyForm, formset=MyBaseFormSet)
>
> >> > > > > def view_func(request):
> >> > > > > formset = MyFormSet(foo='bar')
> >> > > > > ...
>
> >> > > > > hope that helps,
> >> > > > > Justin
>
>
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