没有可重定向到的 URL。提供一个 url 或在模型上定义一个 get_absolute_url 方法
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【中文标题】没有可重定向到的 URL。提供一个 url 或在模型上定义一个 get_absolute_url 方法【英文标题】：No URL to redirect to. Either provide a url or define a get_absolute_url method on the Model 【发布时间】：2016-12-14 21:17:54 【问题描述】：我正在使用 CreateView 来构建一个表单。 CreateView 是从 DetailView 调用的。提交表单后，我希望将经过验证的提交数据返回到初始 DetailView。
DetailView 调用 CreateView 就好了。表单在提交之前按预期工作。然后，我收到此错误：没有要重定向到的 URL。在模型上提供一个 url 或定义一个 get_absolute_url 方法。
我尝试使用this solution，但它会出现同样的错误。我尝试通过调用 CreateView 的 URL 传递数据和重定向。我仍然遇到同样的错误。
谁能告诉我如何将 CreateView 重定向回原来的 DetailView（并传回经过验证的数据？
models.py
class Lawyer(models.Model):
name = models.CharField(max_length=100, default='')
practice_area = models.CharField(max_length=100, default='')
address = models.CharField(max_length=255, default='')
city = models.CharField(max_length=50, default='')
state = models.CharField(max_length=2, default='')
zipcode = models.CharField(max_length=10, default='')
telephone = models.CharField(max_length=15, default='')
years_practice = models.IntegerField(default=10)
objects = models.Manager()
lawyer_slug = models.SlugField(default='')
def get_absolute_url(self):
return reverse('lawyer_detail', kwargs='lawyer_slug': self.lawyer_slug)
def __str__(self):
return self.name
class Review(models.Model):
RATING_CHOICES = (
(0, '0'),
(1, '1'),
(2, '2'),
(3, '3'),
(4, '4'),
(5, '5'),
)
lawyer = models.ForeignKey(Lawyer, null=True)
review_created = models.DateTimeField('Date of Review', auto_now_add=True)
reviewer_name = models.CharField(max_length=55, default='')
reviewer_city = models.CharField(max_length=55, default='')
reviewer_state = models.CharField(max_length=2, default='')
email = models.EmailField(default='')
rating = models.IntegerField(default=1, choices=RATING_CHOICES)
review_comment = models.TextField(default='')
review_slug = models.SlugField(default='')
def get_absolute_url(self):
return reverse('lawyer_createreview', kwargs='review_slug': self.review_slug)
def __str__(self):
return self.review_slug
views.py
class LawyerDetail(DetailView):
model = Lawyer
template = 'lawyer_detail.html'
context_object_name = 'lawyer'
def get_object(self):
lawyer_slug = Lawyer.objects.get(
lawyer_slug=self.kwargs.get('lawyer_slug')
)
return lawyer_slug
def get_context_data(self, **kwargs):
context = super(LawyerDetail, self).get_context_data(**kwargs)
context['lawyer_reviews'] = self.object.review_set.all()
return context
class LawyerReviewCreate(CreateView):
model = Review
form_class = ReviewForm
def get_form_kwargs(self, **kwargs):
kwargs = super(LawyerReviewCreate, self).get_form_kwargs()
redirect = self.request.GET.get('next')
if redirect:
if 'initial' in kwargs.keys():
kwargs['initial'].update('next': redirect)
else:
kwargs['initial'] = 'next': redirect
return kwargs
def form_invalid(self, form):
import pdb;pdb.set_trace() # debug example
return super(LawyerReviewCreate, self).form_invalid(form)
def form_valid(self, form):
redirect = form.cleaned_data.get('next')
if redirect:
self.success_url = redirect
return super(LawyerReviewCreate, self).form_valid(form)
urls.py
url(r'^lawyers/(?P<lawyer_slug>[\w-]+)/$', LawyerDetail.as_view(), name='lawyer_detail'),
url(r'^lawyers/(?P<lawyer_slug>[\w-]+)/createreview/$', LawyerReviewCreate.as_view(), name='lawyer_createreview'),
template.html（调用 CreateView 和显示返回数据的部分）
<div class="review_buttom_wrapper">
<a href="% url 'lawyer_createreview' lawyer.lawyer_slug %?next=% url 'lawyer_detail' lawyer.lawyer_slug %">
<button class="review_button">
<strong>Review</strong> lawyer.name
</button>
</a>
</div>
% for review in lawyer_reviews %
<div style="padding-left: 15px; padding-right: 15px; overflow:auto;">
<div class="review-masthead">
<div class="medium-3 columns">
<p class="posttime"> review.review_created|timesince ago </p>
<p class="review-title"> review.user_name <span class="location"> review.lawyer.city , review.lawyer.state </span></p>
</div>
<div class="medium-7 columns">
<p> review.review_comment </p>
</div>
<div class="medium-2 columns">
<div class="user_rating">
Rating
</div>
<div class="rating_number">
review.rating
</div>
</div>
</div>
% endfor %
forms.py
RATING_CHOICES = (
(1, '1'),
(2, '2'),
(3, '3'),
(4, '4'),
(5, '5'),
)
class ReviewForm(forms.ModelForm):
reviewer_name = forms.CharField(widget = forms.TextInput(attrs='class': 'review_input_box', 'placeholder': 'Your name'))
reviewer_city = forms.CharField(widget = forms.TextInput(attrs='class': 'review_input_box', 'placeholder': 'Your city'))
reviewer_state = forms.CharField(widget = forms.TextInput(attrs='class': 'review_input_box', 'placeholder': 'Your state'))
rating = forms.ChoiceField(choices = RATING_CHOICES, label="", initial='', widget = forms.Select(attrs='class': 'review_selector'), required=True)
email = forms.EmailField(widget = forms.TextInput(attrs='class': 'review_input_box', 'placeholder': 'your-email@email.com'))
review_comment = forms.CharField(widget = forms.Textarea(attrs='class': 'review_input_box', 'placeholder': 'What would you like to say?'))
class Meta:
model = Review
fields = ['reviewer_name', 'reviewer_city', 'reviewer_state', 'rating', 'email', 'review_comment']
Traceback:
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in get_success_url
190. url = self.object.get_absolute_url()
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/ralph/fathers/models.py" in get_absolute_url
142. return reverse('lawyer_createreview', kwargs='lawyer_slug': self.lawyer_slug)
During handling of the above exception ('Review' object has no attribute 'lawyer_slug'), another exception occurred:
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/base.py" in dispatch
88. return handler(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in post
256. return super(BaseCreateView, self).post(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in post
222. return self.form_valid(form)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/ralph/fathers/views.py" in form_valid
165. return super(LawyerReviewCreate, self).form_valid(form)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in form_valid
202. return super(ModelFormMixin, self).form_valid(form)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in form_valid
108. return HttpResponseRedirect(self.get_success_url())
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/generic/edit.py" in get_success_url
193. "No URL to redirect to. Either provide a url or define"
Exception Type: ImproperlyConfigured at /xxxxxxx/xxxxxxx/xxxxxxx-xxxxxx/createreview/
Exception Value: No URL to redirect to. Either provide a url or define a get_absolute_url method on the Model.
在 Review 模型上更改 get_absolute_url 后的回溯
Traceback:
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/contrib/admin/sites.py" in wrapper
265. return self.admin_view(view, cacheable)(*args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/contrib/admin/sites.py" in inner
244. return view(request, *args, **kwargs)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/contrib/contenttypes/views.py" in shortcut
31. absurl = get_absolute_url()
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/xxxxx/xxxxxxx/models.py" in get_absolute_url
142. return reverse('lawyer_createreview', kwargs='review_slug': self.review_slug)
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/urlresolvers.py" in reverse
600. return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
File "/xxxx/xxxxxxxxxx/xxxx/xxxxxxxxxxxx/lib/python3.5/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
508. (lookup_view_s, args, kwargs, len(patterns), patterns))
Exception Type: NoReverseMatch at /admin/r/14/1/
Exception Value: Reverse for 'lawyer_createreview' with arguments '()' and keyword arguments ''review_slug': 'michael-ferrin'' not found. 1 pattern(s) tried: ['fathers/lawyers/(?P<lawyer_slug>[\\w-]+)/createreview/$']
【问题讨论】：
请将完整的错误回溯添加到您的问题中！ 你在reverse里面Review.get_absolute_url()里面的参数有问题。它们看起来像是为Lawyer 准备的。
更改了参数。得到新的错误。请参阅新的回溯。表单提交后，新的 url 似乎没有从 CreateView 路由回原来的 DetailView。
您在get_absolute_url 中传递了review_slug 参数，但该URL 的URL 定义中没有这样的参数（它只有一个lawyer_slug）。
【参考方案1】：
最好的方法是在创建视图上添加一个方法get_success_url 并使用它重定向回详细视图。在创建视图中，您拥有保存后的对象，就像这样
class LawyerReviewCreate(CreateView):
def get_success_url(self):
return reverse('lawyer_detail', kwargs='lawyer_slug': self.object.lawyer_slug)
如果表单有效，这将自动将用户返回到详细视图。
另外，请确保您的 kwargs 使用了正确的密钥，在某些情况下您似乎在使用 review_slug，而在其他情况下您似乎在使用律师_slug
【讨论】：
【参考方案2】：我们可以按照 Django 的建议，在我们的模型中添加一个“get_absolute_url”。它为对象设置了一个规范的 URL，因此即使您的 URL 的结构将来发生变化，对特定对象的引用 是一样的。简而言之，您应该添加一个 get_absolute_url() 方法 您编写的每个模型。
def get_absolute_url(self): # new
return reverse('lawyer_detail', args=[str(self.id)])
这应该可以解决您的问题
【讨论】：
别忘了from django.urls import reverse。另外，reverse 的第一个参数应该是 urls.py 中指定的视图名称。以上是关于没有可重定向到的 URL。提供一个 url 或在模型上定义一个 get_absolute_url 方法的主要内容，如果未能解决你的问题，请参考以下文章
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