[Zope3-dev] CustomWidgetFactory --> UnpickleableError:

[Roger Ineichen]

I got a error if I use CustomWidgetFactory in a EditView.

The add view is working but the edit view not. 
If I change the familyname it seems ok. But if
I change the attributes of a child (class Person)
which is a Object(Field) it ends up in a "UnpickleableError".
If I add the Person as a content type I can edit the 
Person without any problem.

UnpickleableError: Cannot pickle <type 'zope.security._proxy._Proxy'>
objects.

Does anybody have a example of using CustomWidgetFactory 
and generating a EditView with Object(Field). (not in a Sequence)


The interface:
-----
class IFamily(IZope3SampleContent):
    """This interface represents a family.

    A family is used for to store father, mother and children which 
    are implementations of IPerson.
    """

    familyname = TextLine(
        title=_(u"Familyname"),
        description=_(u"The name of the family"),
        default=u"",
        required=True,
        )

    father = Object(title=u'Father',
        description=u'The father of the family',
        required = True,
        readonly = False,
        default = None,
        schema = IPerson
        )

    mother = Object(title=u'Mother',
        description=u'The mother of the family',
        required = True,
        readonly = False,
        default = None,
        schema = IPerson
        )
    ....
-----

The class:
-----
class Family(Zope3SampleContent):
    """Family sample class

    """

    implements(IFamily, IZope3SampleContained) 
    
    #father = FieldProperty(IFamily['father']) # also don't work with
FieldProperty
    #mother = FieldProperty(IFamily['mother']) # "

    def __init__(self, familyname=''):
        self.familyname = familyname
        self.father = None
        self.mother = None
-----

The view class:
-----
father_w = CustomWidgetFactory(ObjectWidget, Person)
mother_w = CustomWidgetFactory(ObjectWidget, Person)

class FamilyAddView(EditView):
    """View for viewing a family"""

    __used_for__ = IFamily

    father_widget = father_w
    mother_widget = mother_w
-----

The edit view:
-----
father_w = CustomWidgetFactory(ObjectWidget, Person)
mother_w = CustomWidgetFactory(ObjectWidget, Person)

class FamilyEditView(EditView):
    """View for editing a family"""

    __used_for__ = IFamily

    father_widget = father_w
    mother_widget = mother_w

------

The traceback
------
2004-04-03T00:56:22 ERROR SiteError
http://localhost:8080/demo/zope3samples/folder/ineichen/@@edit.html
Traceback (most recent call last):
  File "C:\projektCompiler\current\src\zope\publisher\publish.py", line 142,
in publish
    publication.afterCall(request, object)
  File "C:\projektCompiler\current\src\zope\app\publication\browser.py",
line 63, in afterCall
    super(BrowserPublication, self).afterCall(request, ob)
  File
"C:\projektCompiler\current\src\zope\app\publication\zopepublication.py",
line 155, in afterCall
    txn.commit()
  File "C:\projektCompiler\current\src\transaction\_transaction.py", line
254, in commit
    self._commitResources(subtransaction)
  File "C:\projektCompiler\current\src\transaction\_transaction.py", line
283, in _commitResources
    rm.commit(self)
  File "C:\projektCompiler\current\src\transaction\_transaction.py", line
459, in commit
    self.manager.commit(o, txn)
  File "C:\projektCompiler\current\src\ZODB\Connection.py", line 501, in
commit
    self._store_objects(ObjectWriter(obj), transaction)
  File "C:\projektCompiler\current\src\ZODB\Connection.py", line 520, in
_store_objects
    p = writer.serialize(obj)  # This calls __getstate__ of obj
  File "C:\projektCompiler\current\src\ZODB\serialize.py", line 287, in
serialize
    return self._dump(meta, obj.__getstate__())
  File "C:\projektCompiler\current\src\ZODB\serialize.py", line 296, in
_dump
    self._p.dump(state)
UnpickleableError: Cannot pickle <type 'zope.security._proxy._Proxy'>
objects

Regards
Roger Ineichen
_____________________________
Projekt01 GmbH
www.projekt01.ch
Langackerstrasse 8
6330 Cham
phone     +41 (0)41 781 01 78
mobile    +41 (0)79 340 52 32
fax       +41 (0)41 781 00 78
email r.ineichen at projekt01.ch
_____________________________
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