'Process form'

def save(self, *args, **kwargs):

    if self.instance:
        if self.is_valid():
            if self.cleaned_data['status']:
                self.instance.status = self.cleaned_data['status']
            if self.cleaned_data['assignedto']:
                self.instance.assigned.add(self.cleaned_data['assignedto'])
            self.instance.save()
