Question

我想在更新/编辑表单中创建一个Cancel按钮，但我一直收到AttributeError例外：

'PatientUpdate' object has no attribute 'object'

视图：

class PatientUpdate(LoginRequiredMixin, UpdateView):
    model = User
    form_class = MyPatientEditForm        
    template_name = "patient/patient_edit.html"
    success_url = reverse_lazy('patient_list')

    def post(self, request, *args, **kwargs):
        if "cancel" in request.POST:
            url = self.get_success_url()
            return HttpResponseRedirect(url)
        else:
            return super(PatientUpdate, self).post(request, *args, **kwargs)

HTML：

<button class="btn" type="submit" name="cancel" value="Cancel" />Cancel</button>

回溯：

Traceback:
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response
  114.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/views/generic/base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/braces/views.py" in dispatch
  107.             request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/views/generic/base.py" in dispatch
  87.         return handler(request, *args, **kwargs)
File "/Users/Maziar/Dropbox/Sandbox/tutorial/web/views.py" in post
  60.             url = self.get_success_url()
File "/Library/Python/2.7/site-packages/django/views/generic/edit.py" in get_success_url
  133.             url = self.success_url % self.object.__dict__

Exception Type: AttributeError at /patient/edit/3
Exception Value: 'PatientUpdate' object has no attribute 'object'

我到底做错了什么？此外，我考虑过是否可以在模板中获取success_url变量，只需在按钮中使用它而不执行整个POST过程？

更新当表格正常提交时，success_url完全正常。

Answer 1

如果用户按“取消”按钮，他会重定向到患者列表？那么为什么不在没有任何额外逻辑的情况下创建简单的链接：

<a href="{% url 'patient_list' %}">Cancel</a>

Answer 2

get_success_url取决于实际拥有该对象。试试这个：

def post(...):
    if "cancel" in request.POST:
        self.object = self.get_object()
        # ...

这样，get_success_url将有权访问您正在编辑的实例，并且重定向应该有效。

获取模板的成功网址也应该有效：

def get_context_data(self, **kwargs):
    kwargs['success_url'] = self.get_success_url()
    return super(..., self).get_context_data(**kwargs)

Answer 3

我已经更改了submit_line.html模板，并且使用了request.META.HTTP_REFERER可以返回上一个更改列表（包含过滤信息！）来自哪里：

<div class="submit-row">
 {% if show_save %}
 <input type="submit" value="{% trans 'Save' %}" class="default" name="_save" />{% endif %}
   {% if show_delete_link %}
    {% url opts|admin_urlname:'delete' original.pk|admin_urlquote as delete_url %}
    <p class="deletelink-box"><a href="{% add_preserved_filters delete_url %}" class="deletelink">{% trans "Delete" %}</a></p>
   {% endif %}
   {% if show_save_as_new %}<input type="submit" value="{% trans 'Save as new' %}" name="_saveasnew" />{% endif %}
   <a href="{{ request.META.HTTP_REFERER }}"><input type="button" name="Cancel" value="Cancel"></a>
   {% if show_save_and_continue %}<input type="submit" value="{% trans 'Save and continue editing' %}" name="_continue" name="_continue" />{% endif %}
</div>

在UpdateView表单上创建取消按钮

3 个答案: