ERP5Workflow: add _initPersistentObjects method

This fixes Image.py, which was using _initBTree method.

product/ERP5/Document/BusinessTemplate.py

@@ -1373,10 +1373,8 @@ class ObjectTemplateItem(BaseTemplateItem):
         if getattr(obj, '_folder_handler', None) == PERSISTENT_MAPPING_HANDLER:
           # XXX(WORKFLOW): if obj._count(), then, we should export the content
           # of the btree folder to the persistent mapping one
-          obj._cleanup()
-          obj.__init__(obj.id)
-        else:
-          if (getattr(aq_base(obj), '_mt_index', None) is not None and
+          obj._initPersistentObjects()
+        elif (getattr(aq_base(obj), '_mt_index', None) is not None and
               obj._count() == 0):
           # some btrees were exported in a corrupted state. They're empty but
           # their metadata-index (._mt_index) contains entries which in

product/ERP5/Document/Image.py

@@ -53,6 +53,8 @@ from zLOG import LOG, WARNING
 
 from Products.ERP5Type.ImageUtil import transformUrlToDataURI
 
+from Products.ERP5Type.Core.Folder import PERSISTENT_MAPPING_HANDLER
+
 # import mixin
 from Products.ERP5.mixin.text_convertable import TextConvertableMixin
 
@@ -136,7 +138,10 @@ class Image(TextConvertableMixin, File, OFSImage):
     """
     # Quick hack to maintain just enough compatibility for existing sites
     # Convert to new BTreeFolder2 based class
-    if getattr(aq_base(self), '_count', None) is None:
+    if (getattr(aq_base(self), '_folder_handler', None) ==
+        PERSISTENT_MAPPING_HANDLER):
+      self._initPersistentObjects()
+    elif getattr(aq_base(self), '_count', None) is None:
       self._initBTrees()
 
     # Make sure old Image objects can still be accessed

product/ERP5Type/Core/ERP5PersistentMappingFolder.py

@@ -9,6 +9,7 @@ from App.special_dtml import DTMLFile
 from zope.event import notify
 from OFS.event import ObjectWillBeAddedEvent
 from OFS.subscribers import compatibilityCall
+from OFS.ObjectManager import BadRequestException
 from zope.lifecycleevent import ObjectAddedEvent
 from zope.lifecycleevent import ObjectRemovedEvent
 from zope.container.contained import notifyContainerModified
@@ -45,6 +46,13 @@ class ERP5PersistentMappingFolder(PortalFolderBase):
   def __len__(self):
     return self.objectCount()
 
+  def _initPersistentObjects(self, object_id=None):
+    self._cleanup()
+    if object_id is None:
+      self.__init__(self.id)
+    else:
+      self.__init__(object_id)
+
   security.declareProtected(Permissions.AccessContentsInformation, 'get')
   def get(self, name, default=None):
     return self._getOb(name, default)

product/ERP5Type/Core/Folder.py

@@ -613,9 +613,10 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder,
 
   # Overload __init__ so that we do not take into account title
   # This is required for test_23_titleIsNotDefinedByDefault
-  def __init__(self, id):
+  def __init__(self, id, _folder_handler=PERSISTENT_MAPPING_HANDLER):
     self.id = id
-    if self._folder_handler == PERSISTENT_MAPPING_HANDLER:
+    self._folder_handler = _folder_handler
+    if _folder_handler == PERSISTENT_MAPPING_HANDLER:
       ERP5PersistentMappingFolder.__init__(self, id)
 
   security.declarePublic('newContent')
@@ -734,6 +735,9 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder,
       obj = getOb(self, id)
       setOb(self, id, obj)
 
+  def _setFolderHandler(self, folder_handler):
+    self._folder_handler = folder_handler
+
   # Override all BTree and HBTree methods to use if/else
   # method to check wich method must be called
   # We use this method instead of plugin because it make