具有自定义视图的遍历错误

Question

使用定制产品处理Plone 3.3.6实例，该产品应该显示flv类型的视频。我正试图找出从哪里开始排除这个遍历错误。我确信这是在使用Plone 3.1.x (虽然我有很好的想象力)。

TraversalError: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents') 

我已经包括了以下的回溯：

Traceback (innermost last):
  Module ZPublisher.Publish, line 119, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 42, in call_object
  Module zope.formlib.form, line 770, in __call__
  Module zope.formlib.form, line 764, in render
  Module Shared.DC.Scripts.Bindings, line 313, in __call__
  Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
  Module Products.PageTemplates.PageTemplateFile, line 129, in _exec
  Module Products.CacheSetup.patch_cmf, line 77, in PT_pt_render
  Module Products.CacheSetup.patch_utils, line 9, in call_pattern
  Module Products.PageTemplates.PageTemplate, line 98, in pt_render
  Module zope.pagetemplate.pagetemplate, line 117, in pt_render
   - Warning: Macro expansion failed
   - Warning: exceptions.AttributeError: @@tag_macros
  Module zope.tal.talinterpreter, line 271, in __call__
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 891, in do_useMacro
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 957, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 861, in do_defineMacro
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 957, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 949, in do_defineSlot
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 861, in do_defineMacro
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 855, in do_condition
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 534, in do_optTag_tal
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 745, in do_insertStructure_tal
  Module Products.PageTemplates.Expressions, line 223, in evaluateStructure
  Module zope.tales.tales, line 696, in evaluate
   - URL: index
   - Line 128, Column 8
   - Expression: <StringExpr 'plone.belowcontentbody'>
   - Names:
      {'container': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'context': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'default': <object object at 0xb7f33528>,
       'here': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'loop': {},
       'nothing': None,
       'options': {'args': ()},
       'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0xe3c866c>,
       'request': <HTTPRequest, URL=http://videoserver/Members/johndoe/sample-video.flv/file_view>,
       'root': <Application at >,
       'template': <ImplicitAcquirerWrapper object at 0xe34dcec>,
       'traverse_subpath': [],
       'user': <PropertiedUser 'admin'>,
       'view': <Products.Five.metaclass.SimpleViewClass from /data/Plone/buildout/eggs/p4a.video-1.3-py2.4.egg/p4a/video/browser/video.pt object at 0xe4ce36c>,
       'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0xe2fa86c>}
  Module Products.Five.browser.providerexpression, line 37, in __call__
  Module plone.app.viewletmanager.manager, line 154, in render
  Module plone.app.viewletmanager.manager, line 83, in render
  Module plone.app.layout.viewlets.common, line 44, in render
  Module alteroo.assesscontent.browser.viewlet, line 95, in index
  Module Shared.DC.Scripts.Bindings, line 313, in __call__
  Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
  Module Products.PageTemplates.PageTemplateFile, line 129, in _exec
  Module Products.CacheSetup.patch_cmf, line 77, in PT_pt_render
  Module Products.CacheSetup.patch_utils, line 9, in call_pattern
  Module Products.PageTemplates.PageTemplate, line 98, in pt_render
  Module zope.pagetemplate.pagetemplate, line 117, in pt_render
  Module zope.tal.talinterpreter, line 271, in __call__
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 855, in do_condition
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 536, in do_optTag_tal
  Module zope.tal.talinterpreter, line 521, in do_optTag
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 534, in do_optTag_tal
  Module zope.tal.talinterpreter, line 516, in no_tag
  Module zope.tal.talinterpreter, line 346, in interpret
  Module zope.tal.talinterpreter, line 745, in do_insertStructure_tal
  Module Products.PageTemplates.Expressions, line 223, in evaluateStructure
  Module zope.tales.tales, line 696, in evaluate
   - URL: assessment_input
   - Line 12, Column 4
   - Expression: <PathExpr standard:'view/contents'>
   - Names:
      {'container': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'context': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'default': <object object at 0xb7f33528>,
       'here': <ATFile at /sites/videoserver/plone/Members/johndoe/sample-video.flv>,
       'loop': {},
       'nothing': None,
       'options': {'args': (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>,)},
       'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0xe15590c>,
       'request': <HTTPRequest, URL=http://videoserver/Members/johndoe/sample-video.flv/file_view>,
       'root': <Application at >,
       'template': <ImplicitAcquirerWrapper object at 0xe0dacec>,
       'traverse_subpath': [],
       'user': <PropertiedUser 'admin'>,
       'view': <Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>,
       'views': <zope.app.pagetemplate.viewpagetemplatefile.ViewMapper object at 0xe4bb78c>}
  Module zope.tales.expressions, line 217, in __call__
  Module Products.PageTemplates.Expressions, line 155, in _eval
  Module zope.tales.expressions, line 124, in _eval
  Module Products.PageTemplates.Expressions, line 105, in trustedBoboAwareZopeTraverse
  Module zope.traversing.adapters, line 164, in traversePathElement
   - __traceback_info__: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents')
  Module zope.traversing.adapters, line 52, in traverse
   - __traceback_info__: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents', [])
TraversalError: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents')

进一步的信息:我把p4a.video和1.1版联系在一起，构建了1.3个版本。p4a.video与较旧版本的hachoir软件包不兼容，在实例正常启动之前，我至少需要1.2.1软件包。我的构建配置的版本部分现在包括以下内容。

，但它似乎与plone.app.z3cform有关

extends =
        ...
        http://good-py.appspot.com/release/plone.app.z3cform/0.4.9?plone=3.3.6

[versions]
p4a.plonevideoembed = 1.1
p4a.video = 1.1
hachoir-core = 1.2.1
hachoir-metadata = 1.2.1
hachoir-parser = 1.2.1

我一直在做这件事

1. 一般来说，在前台模式下启动我的实例进行故障排除非常有用(bin/instance )。
2. 对于pin版本，http://good-py.appspot.com是一个绝对的生命保护程序( plone.app.z3cform 0.4.3没有选择pin，但是0.4.9已经足够接近了)。因此，我仍然必须显式地将0.4.3引脚在构建的版本部分。

Answer 1

回答我自己的问题。

这个问题与视图有关，与我试图访问的视图相关。

视图在一个名为“assessment_input”的模板中引用了一个自定义的assessment_input，因此是跟踪的这一部分：

- URL: assessment_input
- Line 12, Column 4

我知道这一点是肯定的，因为当我在我的自定义产品的browser/figre.zcml中注释掉这个令人反感的视图时，视图就开始工作了(当然没有显示视图)。

基于z3c.form的表单在plone.z3cform版本0.5.8和更高版本中更改的呈现方式(这里记录在这里：https://dev.plone.org/ticket/10022)，在0.5.8之前的plone.z3cform版本中，过去可以通过在视图模板中调用"view/contents“来呈现表单。追溯意味着较新的plone.z3cform (它不支持“视图/内容”约定)导致了错误。

    - Expression: <PathExpr standard:'view/contents'>

    <snip> ...

      - __traceback_info__: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents', [])
   TraversalError: (<Products.Five.viewlet.metaconfigure.MyFormWrapper object at 0xe4c36cc>, 'contents')

修复要求我在构建中将我的plone.z3cform版本定位为0.5.7

[versions]
plone.z3cform = 0.5.7

正如在问题中提到的，我使用一个好集合(KGS)将plone.app.z3cform 0.4.9的版本固定在一起，我认为这是必要的，但还没有进行绝对的测试。

就目前而言，这是一个足够好的解决方案，接下来我需要为更新版本的产品重写我的视图，以便当我升级到Plone 4.x时，viewlet支持plone.z3cform的更新的、可以说更好的呈现表单的方法。