Django InlineFormView - handle multiple formsets in Class Based Views

base_views.py

class InlineFormView():
    formsets = []

    def get_formsets(self):
        if not self.formsets:
            raise ValueError('InlineFormView needs a "formsets" property.')
        return self.formsets

    def get_context_data(self, **kwargs):
        data = super(InlineFormView, self).get_context_data(**kwargs)

        for form in self.get_formsets():
            if self.request.POST:
                data[form[0]] = form[1](self.request.POST, instance=self.object)
            else:
                data[form[0]] = form[1](instance=self.object)

        return data

    def form_valid(self, form):
        context = self.get_context_data()
        with transaction.atomic():
            self.object = form.save()
            for formset in self.get_formsets():
                form_data = context[formset[0]]
                if form_data.is_valid():
                    form_data.instance = self.object
                    form_data.save()

        return super(InlineFormView, self).form_valid(form)

views.py

from base_views import InlineFormView
from forms import FormSet1, FormSet2


class MyView(InlineFormView, UpdateView):
    formsets = [('formset1', FormSet1), ('formset2', FormSet2)]
    model = MyModel
    template_name = 'example/tpl.html'
    fields = ['title', 'description']
    success_url = reverse_lazy('my_app:my_view')