__init__() got an unexpected keyword argument 'instance'

__init__() got an unexpected keyword argument 'instance'

Im getting the above error when I run this code. This is happening when I
return return modelformset_factory in def get_form_class(self): But its ok
when I use return modelform_factory. What could be the issue with the
code? Thanks
class ModelAdminMixin(LoginRequiredMixin, PermissionMixin):
model = None
#--------------------------------------------------------------------------
def get_form(self, form_class):
form_class = self.get_form_class()
form_kwargs = self.get_form_kwargs()
if hasattr(self, 'request'):
request = self.request
form_kwargs['request'] = request
return form_class(**form_kwargs)
#--------------------------------------------------------------------------
def get_form_class(self):
# if the View sent has it's own form - use it
if getattr(self, 'form_class', None) is not None:
return self.form_class
# check the global form_override settings
form = None
if self.get_model() in form_mapping:#There is a form_mapping.py file
# format is Model: Form
form = form_mapping[self.get_model()]
# if no overriding found - use the standard
if form is None:
form = form_mapping['default']
# create model form dynamically
return modelformset_factory(self.get_model(), extra=2)
#--------------------------------------------------------------------------
def get_model(self):
return self.model
def get_queryset(self):
""" Default queryset is all model's instances
"""
return self.get_model()._default_manager.all()
#--------------------------------------------------------------------------
def get_context_data(self, **kwargs):
""" Inject models into context
"""
context = super(ModelAdminMixin, self).get_context_data(**kwargs)
context['model'] = self.get_model()
context['model_str'] = str(self.get_model())
return context
#--------------------------------------------------------------------------
def dispatch(self, request, *args, **kwargs):
""" Dynamic model import
"""
app = self.kwargs.get('app')
model = self.kwargs.get('model')
if self.model is None and app and model:
app = __import__(app)
app_models = getattr(app, 'models')
model = getattr(app_models, model)
self.model = model
return super(ModelAdminMixin, self).dispatch(request, *args, **kwargs)