python - Pyramid 配置加载错误

Question

我在 Pyramid 中创建应用时遇到了问题。当我尝试通过粘贴服务时，我得到:

  File "/home/viraptor/blah/blah/__init__.py", line 23, in main
    return config.make_wsgi_app()
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 916, in make_wsgi_app
    self.commit()
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 491, in commit
    self._ctx.execute_actions()
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/zope/configuration/config.py", line 626, in execute_actions
    callable(*args, **kw)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 1291, in register
    derived_view = deriver(view)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2681, in __call__
    self.mapped_view(view))))))))
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2624, in inner
    wrapped_view = wrapped(self, view)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2693, in mapped_view
    mapped_view = mapper(**self.kw)(view)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2860, in __call__
    view = self.map_nonclass(view)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2876, in map_nonclass
    ronly = requestonly(view, self.attr)
  File "/home/viraptor/pyramid/lib/python2.6/site-packages/pyramid/config.py", line 2966, in requestonly
    if len(args) - len(defaults) == 1:
zope.configuration.config.ConfigurationExecutionError: <type 'exceptions.TypeError'>: object of type 'NoneType' has no len()
  in:
  ('/home/viraptor/blah/blah/__init__.py', 22, 'main', "config.add_route('customer', '/customer/{customer_id}', view='blah.views.customer.view', view_renderer='customer_view.mak', view_permission='view', traverse='/customer/{customer_id}')")

这可能是什么原因？我最近甚至没有更改该配置，只更改了应用程序的其余部分。

Answer 1

我怀疑您遇到了 Pyramid 较新版本中已修复的错误；您的回溯表明 args 或 defaults 为 None，但除非 args 不是，否则无法到达该代码分支None，而 defaults 可能是 None。我发现以下对 Pyramids 的提交添加了针对 defaults 为 None 的特定测试:

https://github.com/Pylons/pyramid/commit/f168197609169fb01b65adeb3eb59d069000fe2c

我说你有一个没有任何默认值的方法，只有一个请求参数 (method(self, request)，解决方法是添加一个带有默认值的关键字参数 (方法( self ，请求，虚拟=无)。

免责声明:还没有机会使用 Pyramid，所以我的分析完全基于 Pyramid 代码库。