Wagtail 中的资源管理器不显示任何页面

Question

我有两个相同代码的实例（开发和生产），我发现这个问题只发生在生产中。我将两者都部署到了原始实例，这意味着在此之前没有安装 Wagtail。

Wagtail 管理员显示我没有页面。我确实有 2 页，即使我没有，也不应该有 "Welcome to Wagtail Page"（通常是，它在我的开发实例上）。此外，网站似乎缺少一部分内容。

这就是我所看到的，无论我创建了多少页面（我通过 URL 创建它们）

编辑： 这是日志中的完整堆栈跟踪

2017-04-21 10:27:08,898 exception 22370 ERROR Internal Server Error: /admin/pages/
Traceback (most recent call last):
  File "/opt/..../venv/lib/python3.5/site-packages/django/core/handlers/exception.py", line 42, in inner
    response = get_response(request)
  File "/opt/..../venv/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/opt/..../venv/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/..../venv/lib/python3.5/site-packages/django/views/decorators/cache.py", line 43, in _cache_controlled
    response = viewfunc(request, *args, **kw)
  File "/opt/..../venv/lib/python3.5/site-packages/wagtail/wagtailadmin/decorators.py", line 24, in decorated_view
    return view_func(request, *args, **kwargs)
  File "/opt/..../venv/lib/python3.5/site-packages/wagtail/wagtailadmin/views/pages.py", line 104, in index
    'do_paginate': do_paginate,
  File "/opt/..../venv/lib/python3.5/site-packages/django/shortcuts.py", line 30, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader.py", line 68, in render_to_string
    return template.render(context, request)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/backends/django.py", line 66, in render
    return self.template.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 208, in render
    return self._render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 70, in render
    result = block.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 70, in render
    result = block.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
 File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/loader_tags.py", line 174, in render
    return compiled_parent._render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 199, in _render
    return self.nodelist.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 994, in render
    bit = node.render_annotated(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/base.py", line 961, in render_annotated
    return self.render(context)
  File "/opt/..../venv/lib/python3.5/site-packages/django/template/defaulttags.py", line 314, in render
    if match:
  File "/opt/..../venv/lib/python3.5/site-packages/django/core/paginator.py", line 112, in __len__
    return len(self.object_list)
  File "/opt/..../venv/lib/python3.5/site-packages/django/db/models/query.py", line 238, in __len__
    self._fetch_all()
  File "/opt/..../venv/lib/python3.5/site-packages/django/db/models/query.py", line 1087, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/opt/..../venv/lib/python3.5/site-packages/wagtail/wagtailcore/query.py", line 380, in specific_iterator
    pages = model.objects.filter(pk__in=pks)
AttributeError: 'NoneType' object has no attribute 'objects'

Answer 1

经过进一步调查，我发现当您从项目中删除页面模型定义时会发生此错误，但该类型的页面仍然存在。（Wagtail 应该能够优雅地处理这种情况 - 事实上它不是一个错误，我很快就会提交一个问题...）

您可以通过运行在 ./manage.py shell 命令行中输入以下几行来跟踪此问题：

from django.contrib.contenttypes.models import ContentType

[(ct.id, ct.app_label, ct.model) for ct in ContentType.objects.all() if ct.model_class() is None and ct.app_label != 'wagtailadmin']

希望这会产生如下结果：

[(2, u'home', u'homepage')]

显示缺失页面类型的内容类型 ID、应用标签和模型名称。

要让管理员重新工作，运行以下行（确保将 2 替换为上面结果中的内容类型 ID）：

from wagtail.wagtailcore.models import Page

Page.objects.filter(content_type_id=2).update(content_type=ContentType.objects.get(app_label='wagtailcore', model='page'))

这会将受影响的页面转换为 Wagtail 的基本 'Page' 类型（除 'title' 外没有其他内容字段）- 然后您可以继续删除此页面。

Answer 2

对我来说，@sagman 的解决方案只需稍作改动即可。发现如果在 Shell 中输入 wagtail.wagtailcore 但在 INSTALLED 中输入 wagtail.core 会出现 ModuleNotFoundError APPS，需要在Shell中输入from wagtail.core.models import Page而不是wagtail.wagtailcore.models import Page。其他一切都按照@gasman 的说明工作。

Wagtail 中的资源管理器不显示任何页面

Explorer in Wagtail does not show any pages

wagtail