use new IUid interface for showing the presence of the uid property

organize/tracking/storage/compat.py

@@ -6,9 +6,12 @@ Provides a Container subclass that defines methods from cybertools...TrackingSto
 used by code based on loops.organize.tracking.
 """
 
+from zope.interface import implementer
 from cco.storage.tracking import record
+from loops.util import IUid
 
 
+@implementer(IUid)
 class Track(record.Track):
 
     @property

util.py

@@ -24,6 +24,7 @@ import os
 from zope.publisher.browser import BrowserView
 from zope import component
 from zope.catalog.interfaces import ICatalog
+from zope.interface import Attribute, Interface
 from zope.interface import directlyProvides, directlyProvidedBy, implements
 from zope.intid.interfaces import IIntIds
 from zope.i18nmessageid import MessageFactory
@@ -129,12 +130,19 @@ def reindex(obj, catalog=None):
         catalog.index_doc(int(getUidForObject(obj)), obj)
 
 
+# UID stuff
+
+class IUid(Interface):
+    """Provides uid property."""
+
+    uid = Attribute("Unique Identifier")
+
+
 def getItem(uid, intIds=None, storage=None):
     if storage is not None and '-' in uid:
         return storage.getItem(uid)
     return getObjectForUid(uid, intIds=intIds)
 
-
 def getObjectForUid(uid, intIds=None):
     if uid == '*': # wild card
         return '*'
@@ -150,7 +158,8 @@ def getObjectForUid(uid, intIds=None):
 def getUidForObject(obj, intIds=None):
     if obj == '*': # wild card
         return '*'
-    if hasattr(obj, 'uid'):
+    #if hasattr(obj, 'uid'):
+    if IUid.providedBy(obj):
         return str(obj.uid)
     if intIds is None:
         intIds = component.getUtility(IIntIds)