关于django的通用视图的问题

我想利用update_object来更新记录，在url.py里直接引用update_object,
(r'^edit/(?P<object_id>\d+)$',
update_object,
{'form_class':BookForm,
'post_save_redirect':'/',
'queryset':BookMark.objects.all()
}),

<form action="." method="POST">
{{form.as_p}}
<p>
<input type="submit" name="submit" value="Next→" /></button>
</p>
</form>

但却无法更新，而且出现Page not found (404)的错误