金字塔配置加载错误

Question

我在 Pyramid 中创建应用程序时遇到问题。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，仅更改了应用程序的其余部分。

Answer 1

我怀疑你遇到了金字塔新版本中修复的错误；您的回溯表明 args 或 defaults 为 None，但除非 args 不存在，否则无法到达该代码分支None，保留 defaults 为 None 的可能性。我发现以下对 Pyramids 的提交添加了对 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并且只有一个请求参数的方法（method(self, request)< /code>，解决方法是添加一个带有默认值的关键字参数 (method(self, request, dummy=None)

：还没有机会使用 Pyramid，因此我的分析纯粹基于 Pyramid 代码库。

Answer 2

config.add_route 仅接受 1 个位置参数，第二个参数应使用带有 pattern 的关键字。

其次，我认为 route 和 traverse 不可能有相同的模式。使用traverse关键字，您可以定义root应该开始的位置。它在 Configurator< 中进行了解释/code> API 文档。

不过，引发的错误异常可能会提供更多信息。