http://chriskief.com/2015/01/19/create-or-update-with-a-django-modelform/

view.py

from django.views.generic import UpdateView

from forms import MyModelForm
from models import MyModel


class MyUpdateView(UpdateView):

    # specify a custom ModelForm
    form_class = MyModelForm
    # or simply specify the Model
    # model = MyModel

    def get_object(self, queryset=None):

        # get the existing object or created a new one
        obj, created = MyModel.objects.get_or_create(col_1=self.kwargs['value_1'], col_2=self.kwargs['value_2'])

        return obj
        

how to write url.py for both create and update