On Tue, Jan 13, 2009 at 11:57 AM, James PIC <[email protected]> wrote:
> That's what i'm actually trying to do:
>
> # todo : get a more descriptive FC prefix than "jpic"
> class JpicModelFormMetaclass(ModelFormMetaclass):
> """
> Inherit from this, then use this new keyword argument
> 'jpic_field_options' with a dict of dicts such as:
> {
> 'field_name_that_is_m2m': {
> 'queryset': aqueryset,
> },
> 'field_name_that_is_fk': {
> 'queryset': anotherqueryset,
> },
> }
>
> This solves the problem of using a queryset made in the view
> as choices for a M2M/FK field ...
> """
> def __init__(self, *args, **kwargs):
> jpic_field_options = False
> if 'jpic_field_options' in kwargs.keys():
> jpic_field_options = kwargs.pop('jpic_field_options')
> super(JpicModelFormMetaclass, self).__init__(*args, **kwargs)
> if not jpic_field_options:
> return
> for field, args in jpic_field_options.items():
> if field not in self.fields:
> continue
> for arg, value in args.items():
> setattr(self.fields[field], arg, value)
>
> class JpicModelForm(ModelForm):
> __metaclass__ = JpicModelFormMetaclass
>
> This is how i tryed to copy the factory method to use my metaclass:
>
> def get_form_class(self):
> # HACK: we should be able to construct a ModelForm without creating
> # and passing in a temporary inner class
> class Meta:
> pass
> setattr(Meta, 'model', self.model_class)
> setattr(Meta, 'fields', self.get_fields())
> if Group.objects.get(name='Consultants') in
> self.request.user.groups.all():
> class_name = self.model_class_name + 'ConsultantForm'
> else:
> class_name = self.model_class_name + 'ClientForm'
> return JpicModelFormMetaclass(class_name.encode(),
> (JpicModelForm,), {'Meta': Meta,
> 'formfield_callback': lambda
> f: f.formfield()})
>
> This error is thrown:
>
> Traceback:
> File "/home/python/libs/django/core/handlers/base.py" in get_response
> 86. response = callback(request, *callback_args,
> **callback_kwargs)
> File "/home/jpic/sites/devangels/django_tickets/views.py" in root
> 54. return view_class().root(request, url, action, dest_class)
> File "/home/jpic/sites/devangels/django_tickets/views.py" in root
> 210. self.formobj = self.get_form()
> File "/home/jpic/sites/devangels/django_tickets/views.py" in get_form
> 97. form = form_class(instance=self.model,
> jpic_field_options=options)
>
> Exception Type: TypeError at /component/1/ticket/create/
> Exception Value: __init__() got an unexpected keyword argument
> 'jpic_field_options'
>
> Please don't mind the possible problems of my 'formfield_callback'
> argument, i'll fix that ...
Apparently, i should have used the snippet directly (no
JpicModelFormMetaclass) and this factory code:
return ModelFormMetaclass(class_name.encode(), (JpicModelForm,), {'Meta': Meta,
'formfield_callback': lambda f: f.formfield()})
As simple as that ... Case closed, sorry for posting before reading:
http://www.ibm.com/developerworks/linux/library/l-pymeta.html
Regards, James.
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