admin.py 文件源码

def delete_model(self, request, obj):
        # Retrieve the bin page or create it
        try:
            p = Page.objects.get(title_set__title=BIN_PAGE_NAME)
        except ObjectDoesNotExist:
            p = api.create_page(BIN_PAGE_NAME, constants.TEMPLATE_INHERITANCE_MAGIC, BIN_PAGE_LANGUAGE)
        except MultipleObjectsReturned:
            p = Page.objects.filter(title_set__title=BIN_PAGE_NAME).first()

        # is the page already under the ~BIN folder?
        is_in_bin = False
        q = obj
        while q:
            if q.title_set.filter(title=BIN_PAGE_NAME).count() > 0:
                is_in_bin = True
                break
            q = q.parent
        # if yes -> delete it
        if is_in_bin:
            obj.delete()
            p.fix_tree()
            return
        # else -> move it to the bin folder
        # split the contents of the bin into buckets (too many children will slow the javascript down
        bucket_title = datetime.datetime.now().strftime(BIN_BUCKET_NAMING)
        try:
            bucket = Page.objects.get(title_set__title=bucket_title)
        except ObjectDoesNotExist:
            bucket = api.create_page(bucket_title, constants.TEMPLATE_INHERITANCE_MAGIC,
                                               BIN_PAGE_LANGUAGE, parent=p)
        obj.move_page(bucket)
        p.fix_tree()
        obj.fix_tree()
        bucket.fix_tree()