admin.py 文件源码

def add_view(self, request, form_url='', extra_context=None):
        language = request.GET.get('language')
        draft_pk = request.GET.get('draft')
        page = get_object_or_404(Page, pk=draft_pk)

        # check if the current user may view the revision
        # -> if the user may see the page
        user = get_current_user()
        if not user_can_change_page(user, page):
            messages.error(request, _('Missing permission to edit this page which is necessary in order to create a '
                                      'page version.'))
            prev = request.META.get('HTTP_REFERER')
            if prev:
                return redirect(prev)
            else:
                raise Http404

        if page.page_versions.filter(active=True, dirty=False, language=language).count() > 0:
            messages.info(request, _('This page is already revised.'))
            return self.render_close_frame()

        return super(PageVersionAdmin, self).add_view(request, form_url=form_url, extra_context=extra_context)