[Zope3-Users] Fields for file and images

[Johan Carlsson]

James Allwyn wrote:
> I too have been getting "UnpickleableError" while playing with ObjectWidgets.

Hi James,
What I ended up doing was to move the removeSecurityProxy from the 
Content Type Class to the Browser View (where I think it belongs).
(In my case this would be an overriden version of ObjectWidget)

The method applyChanges was override ang changed to include the 
removeSecurityProxy. (see below)

For your example you would have to create a PersonWidget and a 
PageWidget (copy the applyChanges from ObjectWidget and change
so the security is removed before saving).
(The classes might end-up looking the same, som maybe you only
need one?)

But I'm now suspecting the real problem is due to a misconfiguration
in ZCML. I'll let you know what I find out.

Regards,
johan



class FileWidget(ObjectWidget):

     def applyChanges(self, content):

         field = self.context

         # create our new object value
         value = field.query(content, None)
         if value is None:
             # TODO: ObjectCreatedEvent here would be nice
             value = self.factory()

         # apply sub changes, see if there *are* any changes
         # TODO: ObjectModifiedEvent here would be nice
         changes = applyWidgetsChanges(self, field.schema, target=value,
                                       names=self.names)

         # if there's changes, then store the new value on the content
         if changes:
             file=removeSecurityProxy(value)
             form = self.request.form
             filename = getattr(form["field.file.data"], "filename", None)
             contenttype = form.get("field.file.contentType")
             if filename:
                 if not contenttype:
                     contenttype = 
content_types.guess_content_type(filename)[0]
             file.contentType=contenttype

             #descriptor = objectevent.Attributes(IFile, "contentType")
             #descriptor.attributes += "data"
             #event = objectevent.ObjectModifiedEvent(file, descriptor)
             #zope.event.notify(event)

             field.set(content, file)

         return changes




fw = CustomWidgetFactory(FileWidget, File )

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