fixes for _length

lib/python/Products/PluginIndexes/DateRangeIndex/DateRangeIndex.py

@@ -25,6 +25,7 @@ from OFS.SimpleItem import SimpleItem
 
 from BTrees.IOBTree import IOBTree
 from BTrees.IIBTree import IISet, IITreeSet, union, intersection, multiunion
+import BTrees.Length
 
 from Globals import package_home, DTMLFile, InitializeClass
 from AccessControl import ClassSecurityInfo
@@ -136,7 +137,7 @@ class DateRangeIndex(UnIndex):
         self._since         = IOBTree()
         self._until         = IOBTree()
         self._unindex       = IOBTree() # 'datum' will be a tuple of date ints
-        self._length.set(0)
+        self._length        = BTrees.Length.Length()
 
     #
     #   PluggableIndexInterface implementation (XXX inherit assertions?)

lib/python/Products/PluginIndexes/common/UnIndex.py

@@ -99,6 +99,7 @@ class UnIndex(SimpleItem):
     def clear(self):
         self._index = OOBTree()
         self._unindex = IOBTree()
+        self._length.set(0)
 
     def __nonzero__(self):
         return not not self._unindex
@@ -203,7 +204,7 @@ class UnIndex(SimpleItem):
         returnStatus = 0
 
         # First we need to see if there's anything interesting to look at
-        datum = self._get_object_datum(obj, attr)
+        datum = self._get_object_datum(obj, attr)                        
 
         # We don't want to do anything that we don't have to here, so we'll
         # check to see if the new and existing information is the same.