Ticket #22768: createupdateview.py

class BaseCreateUpdateView(ModelFormMixin, ProcessFormView):
    """
    Base view for creating and updating an existing object.

    Using this base class requires subclassing to provide a response mixin.
    """

    object_url_kwargs = ['slug', 'pk']

    def get_object(self, queryset=None):
        if self.is_update_request():
            return super(BaseCreateUpdateView, self).get_object(queryset)
        else:
            return None

    def is_update_request(self):
        """
        Returns True if current request is an object update request, False if it's an object create request.

        Checks if the URL contains a parameter identifying an object.
        Possible URL parameter names are defined in self.object_url_kwargs
        """
        for object_kwarg in self.object_url_kwargs:
            if object_kwarg in self.kwargs:
                return True
        return False

    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(BaseCreateUpdateView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(BaseCreateUpdateView, self).post(request, *args, **kwargs)


class CreateUpdateView(SingleObjectTemplateResponseMixin, BaseCreateUpdateView):
    """
    View for creating a new object instance or updating one,
    with a response rendered by template.
    """
    template_name_suffix = '_form'