django modelformset_factory sustains the previously submitted data even after successfully created the objects

Question

I am using django modelformset_factory in one of my view. I am using javascript for adding new forms to the formset in Template. Everything is working fine but my problem is that when i try to create a new object using modelformset_factory it shows me all the objects as forms which i previously created. Or in simple words it shows me the last submitted forms when i create a new instance using modelformset_factory forms. Like I have defined extra = 0 while initializing the modelformset_factory and from template I added 5 forms to formset and submitted those. Next time when I will re render the template for creating calaendar for another user it show me all the instances which i submitted previously for the previous user. means It iwll show me 5 forms with full data which i submitted for previous user.

My model, Formset, Form and View are as follow.

class Calendar(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=200, null=True, blank=True)
    date = models.DateField(verbose_name=_('Date'))

    def __unicode__(self):
        return self.name

class UserCalendar(forms.ModelForm):
    date =forms.DateField(input_formats=['%d-%m-%Y', '%d-%m-%y'])
    class Meta:
        model = ProviderCalendar 
        exclude = ('user',)


class CalendarFormset(BaseModelFormSet):
    def __init__(self, *args, **kwargs):
        super(CalendarFormset, self).__init__(*args, **kwargs)
        for form in self.forms:
            form.empty_permitted = False

    def clean(self):
        return super(CalendarFormset, self).clean()

class CreateCalendar(LoginRequiredMixin,DetailView):
    model = Profile
    template_name = 'calendar_create.html'
    formset = modelformset_factory(Calendar,
      form=CalendarForm,
    formset=CalendarFormset,
    extra=0,
    )

def get(self, request, *args, **kwargs):
    self.object = self.get_object()
    context = super(CreateCalendar, self).get_context_data(**kwargs)
    context['formset'] = self.formset
    return self.render_to_response(context)

def post(self, request, *args, **kwargs):
    formset = self.formset(request.POST)
    self.object = self.get_object()
    if formset.is_valid():
        for form in formset.save(commit=False):
            form.user = self.get_object().user
            form.save()
        messages.success(request, _('Calendar created successfully'))
        return redirect("detail_profile")
    else:
        return self.render_to_response(self.get_context_data(formset=formset))

and my Next question is I want unique_together = (user, date). I have excluded the user field from forms so unique together forms validations will not work. Is there any way to check the unique dates for the submitted formset forms.

Answer 1

Answer of the first question i.e modelformset_factory always sustains the old data is lies here. https://docs.djangoproject.com/en/1.8/topics/forms/modelforms/#changing-the-queryset as it is given in the docs chenge the queryset by overriding the constructor of the basemodelformset

from django.forms.models import BaseModelFormSet

from myapp.models import Author

class CalendarFormset(BaseModelFormSet):
    def __init__(self, *args, **kwargs):
        super(CalendarFormset, self).__init__(*args, **kwargs)
        self.queryset = Calendar.objects.none()

It will solve the problem 1.