从 3.3.5 迁移到 4.0.7 时，由 p4a.calendar.interfaces.ICalendarSupport 导致的 PicklingError

Question

我正在尝试将 Plone 3.3.5 安装迁移到 4.0.7。

在迁移之前，决定删除 Plone4Artists Calendar。

我们遵循此处建议的程序 http://plone.org/documentation/kb/cleaning-p4a< /a>，将其应用于以下接口：

from p4a.calendar.interfaces import ICalendarEnhanced
from p4a.calendar.interfaces import IPossibleCalendar
from p4a.calendar.interfaces import ICalendarConfig
from p4a.calendar.interfaces import IEventProvider
from p4a.calendar.interfaces import IEvent
from p4a.calendar.interfaces import IBasicCalendarSupport
from p4a.calendar.interfaces import ICalendarSupport

显然，它有效（除了 IPossibleCalendar 接口，我收到一条“只能删除直接提供的接口。”消息）。为了删除它，我们卸载了该产品（遵循 此处）

现在，将 Data.fs 从 3.3.5 移动到 4.0.7 安装后，并且尝试在 /Plone/@@plone-upgrade 激活迁移，我得到以下回溯：

Traceback (most recent call last):
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\plone-4.0.7-py2.6.egg\Products\CMFPlone\MigrationTool.py", line 175, in upgrade
    step['step'].doStep(setup)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\products.genericsetup-1.6.3-py2.6.egg\Products\GenericSetup\upgrade.py", line 142, in doStep
    self.handler(tool)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\plone.app.upgrade-1.0.7-py2.6.egg\plone\app\upgrade\v40\alphas.py", line 443, in migrateFolders
    transaction.savepoint(optimistic=True)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\transaction-1.0.1-py2.6.egg\transaction\_manager.py", line 99, in savepoint
    return self.get().savepoint(optimistic)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\transaction-1.0.1-py2.6.egg\transaction\_transaction.py", line 253, in savepoint
    self._saveAndRaiseCommitishError() # reraises!
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\transaction-1.0.1-py2.6.egg\transaction\_transaction.py", line 250, in savepoint
    savepoint = Savepoint(self, optimistic, *self._resources)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\transaction-1.0.1-py2.6.egg\transaction\_transaction.py", line 647, in __init__
    savepoint = savepoint()
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\zodb3-3.9.5-py2.6-win32.egg\ZODB\Connection.py", line 1128, in savepoint
    self._commit(None)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\zodb3-3.9.5-py2.6-win32.egg\ZODB\Connection.py", line 606, in _commit
    self._store_objects(ObjectWriter(obj), transaction)
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\zodb3-3.9.5-py2.6-win32.egg\ZODB\Connection.py", line 640, in _store_objects
    p = writer.serialize(obj)  # This calls __getstate__ of obj
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\zodb3-3.9.5-py2.6-win32.egg\ZODB\serialize.py", line 422, in serialize
    return self._dump(meta, obj.__getstate__())
  File "d:\plone-4.0.7-teste-20110927\buildout-cache\eggs\zodb3-3.9.5-py2.6-win32.egg\ZODB\serialize.py", line 431, in _dump
    self._p.dump(state)
PicklingError: Can't pickle <class 'p4a.calendar.interfaces.ICalendarSupport'>: import of module p4a.calendar.interfaces failed

请注意，这是一次测试运行：它是一个虚假且干净的 Data.fs，唯一涉及的产品是 P4A.Calendar，仅在 3.3.5 构建中安装（并在将 Data.fs 移至 4.0.7 安装之前卸载）。

我还尝试遵循此处的建议< /a>，并且 Plone 对象的 SiteManager 没有任何带有“p4a”字符串的适配器或订阅者。全局 SiteManager 中的 dict 属性也不会报告任何“p4a”字符串的出现。

谁能给我解释一下吗？我应该在 Data.fs 中哪里查找“p4a.calendar.interfaces.ICalendarSupport”？