[ZODB-Dev] Can't use invokeFactory method in non-FileStorage folder

[Dieter Maurer]

zhimin at iss.nus.edu.sg wrote at 2003-6-26 03:54 +0800:
 > ...
 > The invokeFactory() can create Link (and other Plone objects) in
 > /PloneSite/Members (see Try Block 1 in testAddLink.py), but generate an
 > exception shown below when invokeFactory() is run to create Link in
 > /PloneSite/bdb (see Try Block 2 in testAddLink.py) :
 > 
 > ...
 > Traceback (innermost last):
 > ...
 > getPortalTypesTool
 >   Module Products.CMFCore.utils, line 97, in getToolByName
 > AttributeError: portal_types
 > ...
 >     # Try Block 2
 >     try:
 >         db = configuration.getDatabase(name='BDB')
 >         conn = db.open()
 >         root = conn.root()
 >         storage_folder = getattr(root['Application'], 'PloneSite', None)
 >         storage_folder = getattr(storage_folder, 'bdb', None)
 >         storage_folder.invokeFactory(id='789', type_name='Link')
 >         get_transaction().commit()
 >     finally:
 >         conn.close()

"getToolByName" uses acquisition to find the portal.
In your "bdb" case, the acquisition context ends at the mount point
and therefore below the portal.

Your solution is too sophisticated.
You need (and should) not open a connection explicitely but rely on
Zope doing it automatically during normal traversal/attribute lookup.
Opening a database connection is for exceptional cases only...


Dieter