鹡鸰0.8.6 - 管理 - NoneType”对象有没有属性‘allowed_subpage_types’

Question

我使用鹡鸰0.8.6与1.7.7 Django的，当我试图访问特定页面在admin：

http://127.0.0.1:8020/admin/pages/4/ 

我得到以下错误：

AttributeError at /admin/pages/4/ 
'NoneType' object has no attribute 'allowed_subpage_types' 

这是回溯：

Environment: 


Request Method: GET 
Request URL: http://127.0.0.1:8020/admin/pages/4/ 

Django Version: 1.7.7 
Python Version: 2.7.3 
Installed Applications: 
('django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'raven.contrib.django.raven_compat', 
'compressor', 
'taggit', 
'modelcluster', 
'django.contrib.admin', 
'preventconcurrentlogins', 
'django_medusa', 
'wagtail.wagtailcore', 
'wagtail.wagtailadmin', 
'wagtail.wagtaildocs', 
'wagtail.wagtailsnippets', 
'wagtail.wagtailusers', 
'wagtail.wagtailimages', 
'wagtail.wagtailembeds', 
'wagtail.wagtailsearch', 
'wagtail.wagtailredirects', 
'wagtail.contrib.wagtailmedusa', 
'myapp', 
'django_extensions') 
Installed Middleware: 
('django.middleware.common.CommonMiddleware', 
'django.contrib.sessions.middleware.SessionMiddleware', 
'django.middleware.csrf.CsrfViewMiddleware', 
'django.contrib.auth.middleware.AuthenticationMiddleware', 
'django.contrib.messages.middleware.MessageMiddleware', 
'django.middleware.clickjacking.XFrameOptionsMiddleware', 
'preventconcurrentlogins.middleware.PreventConcurrentLoginsMiddleware', 
'wagtail.wagtailcore.middleware.SiteMiddleware', 
'wagtail.wagtailredirects.middleware.RedirectMiddleware') 


Template error: 
In template /home/vagrant/venv/local/lib/python2.7/site-packages/wagtail/wagtailadmin/templates/wagtailadmin/pages/list.html, error at line 265 
    'NoneType' object has no attribute 'allowed_subpage_types' 
    255 :       {% if allow_navigation %} 


    256 :        {% if moving %} 


    257 :         {% if page.can_descend %} 


    258 :          <a href="{% url 'wagtailadmin_pages_move_choose_destination' page_to_move.id page.id %}" class="icon text-replace icon-arrow-right navigate-pages" title="{% blocktrans with title=page.title %}Explorer subpages of '{{ title }}'{% endblocktrans %}">{% trans 'Explore' %}</a> 


    259 :         {% endif %} 


    260 :        {% elif choosing %} 


    261 :         {% if page.can_descend %} 


    262 :          <a href="{% url 'wagtailadmin_choose_page_child' page.id %}?{{ querystring }}" class="icon text-replace icon-arrow-right navigate-pages" title="{% blocktrans with title=page.title %}Explorer subpages of '{{ title }}'{% endblocktrans %}">{% trans 'Explore' %}</a> 


    263 :         {% endif %} 


    264 :        {% else %} 


    265 :         {% if page.is_navigable %} 


    266 :          <a href="{% url 'wagtailadmin_explore' page.id %}" class="icon text-replace icon-arrow-right" title="{% blocktrans with title=page.title %}Explore child pages of '{{ title }}'{% endblocktrans %}">{% trans "Explore" %}</a> 


    267 :         {% elif page_perms.can_add_subpage %} 


    268 :          <a href="{% url 'wagtailadmin_pages_add_subpage' page.id %}" class="icon text-replace icon-plus-inverse" title="{% blocktrans with title=page.title %}Add a child page to '{{ title }}'{% endblocktrans %}">{% trans 'Add subpage' %}</a> 


    269 :         {% endif %} 


    270 :        {% endif %} 


    271 :       {% endif %} 


    272 :      </td> 


    273 :     </tr> 


    274 :    {% endfor %} 


    275 :   {% else %} 


Traceback: 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response 
    111.      response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py" in _wrapped_view 
    21.     return view_func(request, *args, **kwargs) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/wagtail/wagtailadmin/views/pages.py" in index 
    65.   'pages': pages, 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/shortcuts.py" in render 
    50.  return HttpResponse(loader.render_to_string(*args, **kwargs), 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader.py" in render_to_string 
    178.   return t.render(context_instance) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    148.    return self._render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _render 
    142.   return self.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    126.   return compiled_parent._render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _render 
    142.   return self.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    126.   return compiled_parent._render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _render 
    142.   return self.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    126.   return compiled_parent._render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _render 
    142.   return self.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    65.     result = block.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    65.     result = block.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/loader_tags.py" in render 
    150.     return template.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    148.    return self._render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _render 
    142.   return self.nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render 
    312.     return nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render 
    201.        nodelist.append(node.render(context)) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render 
    312.     return nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render 
    312.     return nodelist.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in render 
    844.     bit = self.render_node(node, context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/debug.py" in render_node 
    80.    return node.render(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in render 
    305.      match = condition.eval(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/defaulttags.py" in eval 
    898.   return self.value.resolve(context, ignore_failures=True) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in resolve 
    596.     obj = self.var.resolve(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in resolve 
    734.    value = self._resolve_lookup(context) 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/django/template/base.py" in _resolve_lookup 
    788.        current = current() 
File "/home/vagrant/venv/local/lib/python2.7/site-packages/wagtail/wagtailcore/models.py" in can_add_subpage 
    1269.   if not self.page.specific_class.allowed_subpage_types(): # this page model has an empty subpage_types list, so no subpages are allowed 

Exception Type: AttributeError at /admin/pages/4/ 
Exception Value: 'NoneType' object has no attribute 'allowed_subpage_types' 

升级之前，与鹡鸰0.5 nd Django 1.6.5正在工作。 任何想法会导致什么？

Answer 1

我今天也碰到了这个bug。

我在wagtailcore models.py文件中找到了这行代码，并添加了一条print语句来缩小哪个页面导致问题。

def can_add_subpage(self): 
    print self 

从那里我检查了数据库中的wagtailcore_page表并找到了特定的页面。在我的情况下，它指向一个不再使用的模型的内容类型，并相应地更新了数据库。

您也可以在shell中对此进行测试。

from wagtail.wagtailcore.models import Page 
pages = Page.objects.all() 
for p in pages: 
    if not p.specific_class: 
     print p 

我已经看到了这个经常发生在CMS的，您可以创建一个特定类型的页面，然后删除/重命名的模型，但在页面树中的旧数据保持。在删除代码之前，我总是试图确保我已经首先在CMS中删除了这些内容类型。

希望这将指向你在正确的方向。 W on。

Answer 2

谢谢！我解决了由：

from wagtail.wagtailcore.models import Page pages = Page.objects.all() for p in pages: if not p.specific_class: p.delete()