[Kss-devel] "Could not adapt" error with event subscribers firing during an ajax call

[Hedley Roos]

David Bain gives a complete explanation at 
http://lists.plone.org/pipermail/product-developers/2007-October/000882.html

This is a straight copy-and-paste from that page. My comments below...



----- snippet ---
I have some code that creates a simple folder.
It seems that when invokeFactory is called via a "kss wrapper", the result
is a 'could not adapt' error.
Maybe I'm misinterpreting this, anyone familiar with this issue? Would love
your assistance.

I've included traceback and snippets of the original code, I figure that
should help.

Note:

    - that when the method is called directly or via a non-kss based
    method it works fine.
    - When called wrapped in a kss based method I get a 'could not adapt'
    error.


the traceback when called from my KSS based method:

2007-10-23 07:46:06 ERROR Zope.SiteErrorLog
http://localhost:8081/Plone/poleroll/my-roll/kss_do_stuff/do_stuff
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 <wrapper>, line 5, in wrapper
   Module kss.core.actionwrapper, line 238, in apply
   Module Products.peopleroll.browser.dostuff, line 12, in do_stuff
   Module Products.peopleroll.content.organization, line 276, in 
do_the_stuff
   Module Products.CMFCore.PortalFolder, line 315, in invokeFactory
   Module Products.CMFCore.TypesTool, line 716, in constructContent
   Module Products.CMFCore.TypesTool, line 276, in constructInstance
   Module Products.CMFCore.TypesTool, line 450, in _constructInstance
   Module Products.ATContentTypes.content.folder, line 7, in addATFolder
   Module OFS.ObjectManager, line 348, in _setObject
   Module zope.app.container.contained, line 365, in notifyContainerModified
   Module zope.event, line 23, in notify
   Module zope.component.event, line 26, in dispatch
   Module zope.component._api, line 130, in subscribers
   Module zope.component.registry, line 290, in subscribers
   Module zope.interface.adapter, line 535, in subscribers
   Module kss.core.kssview, line 127, in _eventRedispatcher
   Module zope.component._api, line 130, in subscribers
   Module zope.component.registry, line 290, in subscribers
   Module zope.interface.adapter, line 535, in subscribers
   Module plone.app.kss.globalui, line 23, in
attributesTriggerDocumentBylineReload
   Module kss.core.kssview, line 169, in getCommandSet
TypeError: ('Could not adapt', <Products.Five.metaclass.DoTheStuff object at
0x6ca7470>, <InterfaceClass plone.app.kss.commands.interfaces.IZopeCommands
 >)


The Original Method from a content type called an organization:
----snip---
     security.declarePublic('do_the_stuff')
     def do_the_stuff(self,results, **kwargs):
         """
          do stuff here
         """
         dtnow = DateTime()
         year = str(DateTime.year(dtnow))
         if year not in self.contentIds():
             self.invokeFactory(id=year,title=year,type_name="Folder")
----snip---


The KSS class:
from kss.core import KSSView, kssaction
from Acquisition import aq_inner
from datetime import datetime

class DoTheStuff(KSSView):

     @kssaction
     def do_stuff(self, widgetid='blah', href='yah.com'):
         ksscore = self.getCommandSet('core')
         selector = ksscore.getHtmlIdSelector('organization-results')
         do_it = self.context.do_the_stuff
         output = do_it()

         ksscore.replaceInnerHTML(selector,
                 '<h1>%s</h1>' % output)
-------------- next part --------------
----- snippet ---



I have the exact same error when trying to call 
portal_membership.addMember during an ajax call.

It seems that an event subscriber notifyContainerModified branches off 
into some code that updates the document byline via ajax.

 From globalui.py we have

@component.adapter(None, IKSSView, IObjectModifiedEvent)
def attributesTriggerDocumentBylineReload(obj, view, event):
     ksscore = view.getCommandSet('core')
     selector = ksscore.getHtmlIdSelector('plone-document-byline')
     zopecommands = view.getCommandSet('zope')
     zopecommands.refreshViewlet(selector,
                                 'plone.belowcontenttitle',
                                'plone.belowcontenttitle.documentbyline')

 From kssview.py we have

def getCommandSet(self, name):
         commandset = getRegisteredCommandSet(name)
         # return the adapted view
         return commandset.provides(self)

getCommandSet successfully retrieves the core commandset, but the "could 
not adapt" error happens when trying to retrieve the zope commandset.

At first I thought that the calling context must be wrong (the 
commandset.provides(self) bit), but how can that be? self is surely a view?

So, bit stuck here. David Bain also received no replies. Anyone else 
have this issue?

Hedley