我的应用程序(部署到Heroku-fwiw)有两个模型对象,Org
和{Theme
并修改了一些url路由以使用其slug时,我现在遇到了以下错误,请求Org
(视图以org.slug
为参数的url路径)的视图:
AttributeError: 'NoneType' object has no attribute 'org'
和404
在org.models.py在
class Org(models.Model):
name = models.CharField(max_length=100, unique=True)
slug = AutoSlugField(populate_from='name')
themes = models.ManyToManyField('common.Theme', related_name='orgs', blank=True)
...
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('org-detail', args=[self.slug])
class Event(models.Model):
org = models.ForeignKey('Org', on_delete=models.CASCADE, related_name='events')
name = models.CharField(max_length=120)
slug = AutoSlugField(populate_from='name', unique_with='org', sep='-')
...
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('event-detail', args=[self.org.slug, self.slug])
在通用.models.py在
^{pr2}$在org.url.py在
urlpatterns = [
url(r'^org/(?P<org_slug>[-\w]+)/?$', views.org, name='org-detail'),
url(r'^org/(?P<org_slug>[-\w]+)/event/(?P<slug>[-\w]+)/', include([
url(r'^$', views.event, name='event-detail'),
...
])),
...
]
在common.url.py在
urlpatterns = [
url(r'^(?P<slug>[-\w]+)/?$', views.theme, name='theme'),
...
]
在组织视图.py在
def event(request, org_slug, slug):
event = Event.objects.filter(slug=slug).order_by('id').first()
if event.org.slug != org_slug:
raise Http404
event_url = '{}{}{}'.format(settings.DEFAULT_PROTOCOL, settings.APP_DOMAIN, event.get_absolute_url())
context = {
'event': event,
'event_url': event_url,
'event_url_encode': urlquote_plus(event_url),
}
return render(request, 'orgs/event.html', context)
def org(request, slug, role=None):
try:
org = Org.objects.get(slug=slug)
except Org.DoesNotExist:
return HttpResponseBadRequest()
context = {
'org': org,
}
return render(request, 'orgs/org.html', context)
在视图.事件按预期返回有效响应。views.org网站以前,但现在返回404。log err实际上显示了由视图.事件,但我不明白为什么:
Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
response = get_response(request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response
response = self._get_response(request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/app/.heroku/python/lib/python3.6/site-packages/channels/handler.py", line 237, in process_exception_by_middleware
return super(AsgiHandler, self).process_exception_by_middleware(exception, request)
File "/app/.heroku/python/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/app/.heroku/python/lib/python3.6/contextlib.py", line 52, in inner
return func(*args, **kwds)
File "/app/project/utils/helpers.py", line 28, in _decorated
return view(request, *args, **kwargs)
File "/app/.heroku/python/lib/python3.6/site-packages/htmlmin/decorators.py", line 13, in minify
response = f(*args, **kwargs)
File "/app/orgs/views.py", line 243, in event
if event.org.slug != org_slug:
AttributeError: 'NoneType' object has no attribute 'org'
{{cd8>
实际上,代码中的问题在于first()。
first
如果查询集中没有匹配的对象,则返回None。你应该改成这样:我通过在中更改url路径来消除错误通用网址从
收件人:
^{pr2}$之后呢视图.事件以及views.org网站按预期工作。我使用的url配置导致了一个regex问题,导致了底层NoneType错误。我仍然不完全理解正则表达式问题的原因/来源。在
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