Abstract Forms Django : __init__() got multiple values for argument - django

Question

I want to make an AbstractEditForm (Inherited from ModelForm) form, from which there are multiple forms that would be inheriting from it. But I am getting this error :
Here is my forms.py
# This is the abstract form that I want to inherit other forms from
class AbstractEditForms(forms.ModelForm):
def __init__(self, id_fields=None, ref_field=None,
model=None, *args, **kwargs):
self.id_fields = id_fields
self.changed_fields = {}
self.ref_field = ref_field
self.model_ = model
self.ref_id_changed = False
self.check_ref_id()
try:
if 'id_fields' in kwargs.keys():
del kwargs['id_fields']
if 'ref_fields' in kwargs.keys():
del kwargs['ref_fields']
except KeyError as e:
print('Error in AbstractionEditForms :', str(e))
super(AbstractEditForms, self).__init__(*args, **kwargs)
# This is the form that I want to use
class SchemeEditForm(AbstractEditForms):
class Meta:
model = SchemeModel
exclude = ['created_on', 'financial_year']
widgets = {
'as_ref_id': forms.TextInput(attrs={'readonly': 'readonly',
'placeholder': 'Auto Generated '
}),
'admin_sanction_amount': forms.HiddenInput(),
'updated_on': forms.HiddenInput(),
}
views.py :
def edit_scheme_form_view(request, pk=None):
assert pk is not None, 'pk cannot be None, scheme edit form'
instance = get_object_or_404(SchemeModel, pk=pk)
id_fields = ['technical_authority', 'dept_name', ]
model = SchemeModel
ref_field = "as_ref_id"
if request.method == 'GET':
scheme_form = SchemeEditForm(None, id_fields=id_fields, ref_field="as_ref_id",
model=model, instance=instance)
context = {
'form': scheme_form
}
return render(request, 'Forms/forms/SchemeForm.html', context=context)
if request.method == 'POST':
scheme_form = SchemeEditForm(request.POST, id_fields=id_fields, ref_field="as_ref_id",
model=SchemeModel, instance=instance)
if scheme_form.is_valid():
instance = scheme_form.save()
return generate_success_page(request, instance,"Scheme Edit Success",
"Scheme Details - Edited", nav_dict=None,
util_dict=None)
else:
return render(request, 'Forms/forms/SchemeForm.html', {'form': scheme_form})
Error traceback:
Internal Server Error: /edit/admin-sanction-form/1/
Traceback (most recent call last):
File "C:\Python35\lib\site-packages\django\core\handlers\base.py", line 149, in get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Python35\lib\site-packages\django\core\handlers\base.py", line 147, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\karth\PycharmProjects\phc\edit_forms\views.py", line 17, in edit_scheme_form_view
model=model, instance=instance
TypeError: __init__() got multiple values for argument 'id_fields'
[04/Sep/2016 20:41:08] "GET /edit/admin-sanction-form/1/ HTTP/1.1" 500 63681
I understand that this is problem with initialization form either AbstractEditForm or the SchemeEditForm.
Any help would be much appreciated.

Answer 1

SchemeEditForm is interpreting the first positional argument you are passing it as being the id_fields argument. When you later try to pass id_fields by name, it thinks it is getting a duplicate of that argument and you are getting an error.
Try changing your __init__() method to accept arbitrary positional arguments before your keyword arguments like this:
def __init__(self, *args, id_fields=None, ref_field=None, model=None, **kwargs):
I am not sure if this will get you the results you want in terms of how your forms function, but it will get rid of the error you are seeing. Note that this method will not work in Python 2.X, only Python 3.