首页 / 问题 / 正文

Django Gunicorn：调用元类基时出错

1 投票
1 回答
670 浏览
提问于 2025-04-16 19:56

我有一个Django应用程序，其中包含一个自定义的模型字段（还有相应的表单字段）。当我用内置的开发服务器运行这个项目时，一切正常。但是，当我用gunicorn启动服务器时，就出现了以下错误：

TemplateSyntaxError at /admin/
Caught TypeError while rendering: Error when calling the metaclass bases
    must be type, not None

为了完整起见，我把整个错误信息都贴在下面，这里显示了出错的那一行：

Traceback:
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/contrib/admin/sites.py" in wrapper
  214.                 return self.admin_view(view, cacheable)(*args, **kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  93.                     response = view_func(request, *args, **kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  79.         response = view_func(request, *args, **kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
  197.             return view(request, *args, **kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  79.         response = view_func(request, *args, **kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/contrib/admin/sites.py" in index
  382.             context_instance=context_instance
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/shortcuts/__init__.py" in render_to_response
  20.     return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/loader.py" in render_to_string
  188.         return t.render(context_instance)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  123.             return self._render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  127.         return compiled_parent._render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  127.         return compiled_parent._render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in _render
  117.         return self.nodelist.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  311.             return self.nodelist_true.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  311.             return self.nodelist_true.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  64.             result = block.nodelist.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/base.py" in render
  744.                 bits.append(self.render_node(node, context))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/debug.py" in render_node
  73.             result = node.render(context)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  437.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=context.current_app)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse
  391.             *args, **kwargs)))
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse
  312.         possibilities = self.reverse_dict.getlist(lookup_view)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_reverse_dict
  229.             self._populate()
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  208.                     for name in pattern.reverse_dict:
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_reverse_dict
  229.             self._populate()
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  208.                     for name in pattern.reverse_dict:
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_reverse_dict
  229.             self._populate()
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  197.         for pattern in reversed(self.url_patterns):
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_url_patterns
  279.         patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/core/urlresolvers.py" in _get_urlconf_module
  274.             self._urlconf_module = import_module(self.urlconf_name)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/utils/importlib.py" in import_module
  35.     __import__(name)
File "/home/rob/projects/shipp/shipp/tickets/urls.py" in <module>
  3. from shipp.tickets.views import TicketListView, TicketDetailView, \
File "/home/rob/projects/shipp/shipp/tickets/views.py" in <module>
  15. from shipp.tickets.forms import TicketForm, TicketAttributesForm, \
File "/home/rob/projects/shipp/shipp/tickets/forms.py" in <module>
  26. class TicketTimeSpentForm(forms.ModelForm):
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/forms/models.py" in __new__
  205.                                       opts.exclude, opts.widgets, formfield_callback)
File "/home/rob/.virtualenvs/shipp/lib/python2.7/site-packages/django/forms/models.py" in fields_for_model
  159.             formfield = f.formfield(**kwargs)
File "/home/rob/projects/shipp/shipp/../shipp/tickets/fields.py" in formfield
  43.         return super(TimedeltaField, self).formfield(*args, **defaults)

Exception Type: TemplateSyntaxError at /admin/
Exception Value: Caught TypeError while rendering: Error when calling the metaclass bases
    must be type, not None

从错误追踪信息中可以看到，导致问题的那一行（在fields.py的第43行）只是一个普通的super调用。你们有没有想过为什么会出现这个错误？如果我删除上面提到的那个方法，错误也会出现在其他地方。

django 错误追踪 开发环境 应用程序调试 gunicorn 自定义模型字段 服务器启动

1 个回答

1

这是因为在我们尝试重新加载Django时，Gunicorn出现了一个错误。这个问题已经被修复，并且在主版本中已经恢复正常。我们目前正在寻找另一种方法来让run_gunicorn命令可以正常重新加载。你可以在这里关注这个进展：

https://github.com/benoitc/gunicorn/issues/222

回答于 2025-04-16 由 Python大师
分享 举报

撰写回答