【发布时间】：2020-08-10 14:02:09
【问题描述】：
我有一个运行 DjangoCMS 3.7.1 和 Django 2.2 的有效 DjangoCMS 应用程序，但是在我刚刚将 DjangoCMS 版本提升到 3.7.2 并使用它，Django 到 3.0.1 之后，我现在在页面上收到渲染错误我有一个简单的列表视图。
该站点将很好地加载我的自定义帐户登录页面，但是一旦登录，列表视图就会中断并显示此错误： 追溯
django.request ERROR 2020-04-26 21:15:16,809 log 461 140647593613056 Internal Server Error: /en/
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py", line 145, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py", line 143, in _get_response
response = response.render()
File "/usr/local/lib/python3.8/site-packages/django/template/response.py", line 105, in render
self.content = self.rendered_content
File "/usr/local/lib/python3.8/site-packages/django/template/response.py", line 83, in rendered_content
return template.render(context, self._request)
File "/usr/local/lib/python3.8/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 171, in render
return self._render(context)
File "/usr/local/lib/python3.8/site-packages/django/test/utils.py", line 95, in instrumented_test_render
return self.nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "/usr/local/lib/python3.8/site-packages/django/test/utils.py", line 95, in instrumented_test_render
return self.nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/classytags/core.py", line 154, in render
return self.render_tag(context, **kwargs)
File "/usr/local/lib/python3.8/site-packages/sekizai/templatetags/sekizai_tags.py", line 88, in render_tag
rendered_contents = nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/classytags/core.py", line 154, in render
return self.render_tag(context, **kwargs)
File "/usr/local/lib/python3.8/site-packages/cms/templatetags/cms_tags.py", line 447, in render_tag
return toolbar.render_with_structure(context, nodelist)
File "/usr/local/lib/python3.8/site-packages/cms/toolbar/toolbar.py", line 477, in render_with_structure
rendered_contents = nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/loader_tags.py", line 62, in render
result = block.nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/defaulttags.py", line 309, in render
return nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/loader_tags.py", line 188, in render
return template.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 173, in render
return self._render(context)
File "/usr/local/lib/python3.8/site-packages/django/test/utils.py", line 95, in instrumented_test_render
return self.nodelist.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 936, in render
bit = node.render_annotated(context)
File "/usr/local/lib/python3.8/site-packages/django/template/base.py", line 903, in render_annotated
return self.render(context)
File "/usr/local/lib/python3.8/site-packages/django/template/defaulttags.py", line 166, in render
len_values = len(values)
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 258, in __len__
self._fetch_all()
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 1261, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/usr/local/lib/python3.8/site-packages/django/db/models/query.py", line 74, in __iter__
for row in compiler.results_iter(results):
File "/usr/local/lib/python3.8/site-packages/django/db/models/sql/compiler.py", line 1081, in apply_converters
value = converter(value, expression, connection)
TypeError: from_db_value() missing 1 required positional argument: 'context'
django.server ERROR 2020-04-26 21:15:19,051 basehttp 461 140647593613056 "GET /en/ HTTP/1.1" 500 314261
pipfreeze
amqp==2.5.2
asgiref==3.2.7
astroid==2.3.3
attrs==19.3.0
beautifulsoup4==4.9.0
billiard==3.6.3.0
boto==2.49.0
celery==4.4.2
certifi==2020.4.5.1
chardet==3.0.4
coverage==5.1
dicttoxml==1.7.4
Django==3.0.1
django-appconf==1.0.4
django-bootstrap-form==3.4
django-classy-tags==1.0.0
django-cms==3.7.2
django-crispy-forms==1.9.0
django-debug-toolbar==2.2
django-environ==0.4.5
django-extensions==2.2.9
django-filer==1.7.0
django-formtools==2.2
django-ipware==2.1.0
django-js-asset==1.2.2
django-mail-queue==3.2.4
django-meta==1.6.1
django-model-utils==4.0.0
django-money==1.1
django-mptt==0.11.0
django-parler==2.0.1
django-polymorphic==2.1.2
django-reversion==3.0.7
django-robots==4.0
django-sekizai==1.1.0
django-select2==7.2.3
django-storages==1.9.1
django-taggit==1.2.0
django-taggit-autosuggest==0.3.8
django-taggit-templatetags==0.2.5
django-templatetag-sugar==1.0
django-treebeard==4.3.1
django-user-accounts==3.0.0
djangocms-admin-style==1.5.0
djangocms-attributes-field==1.2.0
djangocms-bootstrap4==1.6.0
djangocms-file==2.4.0
djangocms-googlemap==1.4.0
djangocms-icon==1.5.0
djangocms-link==2.6.0
djangocms-picture==2.4.0
djangocms-snippet==2.3.0
djangocms-style==2.3.0
djangocms-text-ckeditor==3.9.0
djangocms-video==2.3.0
djangorestframework==3.11.0
easy-thumbnails==2.7
fancycompleter==0.9.1
gunicorn==20.0.4
html5lib==1.0.1
idna==2.9
isort==4.3.21
kombu==4.6.8
lazy-object-proxy==1.4.3
mccabe==0.6.1
mimeparse==0.1.3
more-itertools==8.2.0
packaging==20.3
pdbpp==0.10.2
Pillow==7.1.2
pluggy==0.13.1
psycopg2-binary==2.8.5
py==1.8.1
py-moneyed==0.8.0
Pygments==2.6.1
pylint==2.4.4
pyparsing==2.4.7
pyrepl==0.9.0
pytest==5.4.1
pytest-django==3.9.0
pytest-pythonpath==0.7.3
python-dateutil==2.8.1
pytz==2019.3
pyuploadcare==2.6.0
redis==3.4.1
requests==2.23.0
six==1.14.0
soupsieve==2.0
sqlparse==0.3.1
Unidecode==1.1.1
urllib3==1.25.9
vine==1.3.0
wcwidth==0.1.9
webencodings==0.5.1
whitenoise==5.0.1
wmctrl==0.3
wrapt==1.11.2
查看
class ProductView(LoginRequiredMixin, ListView):
template_name = "products/index.html"
model = models.Product
def get_queryset(self):
qs = super().get_queryset()
tag = self.request.GET.get("tag")
if tag:
qs = qs.filter(tags__slug=tag)
strain = self.request.GET.get("strain")
if strain:
qs = qs.filter(strain__label__icontains=strain)
return qs
当我单步执行视图代码时，通过将 pdb 放入 setup 方法中，我得到了下面提到的这个渲染调用，它似乎是追溯开始的地方：
129 # If the response supports deferred rendering, apply template
130 # response middleware and then render the response
131 elif hasattr(response, 'render') and callable(response.render):
132 for middleware_method in self._template_response_middleware:
133 response = middleware_method(request, response)
134 # Complain if the template response middleware returned None (a common error).
135 if response is None:
136 raise ValueError(
137 "%s.process_template_response didn't return an "
138 "HttpResponse object. It returned None instead."
139 % (middleware_method.__self__.__class__.__name__)
140 )
141
142 try:
143 -> response = response.render()
144 except Exception as e:
145 response = self.process_exception_by_middleware(e, request)
146
147 return response
(Pdb++)
TypeError: from_db_value() missing 1 required positional argument: 'context'
[62] > /usr/local/lib/python3.8/site-packages/django/core/handlers/base.py(143)_get_response()
-> response = response.render()
> /usr/local/lib/python3.8/site-packages/django/core/handlers/base.py(143)
任何方向或帮助将不胜感激，也很乐意在必要时提供更多背景信息——我是 Stackoverflow 的新手。
【问题讨论】：
标签： python django django-models django-views django-cms