Hi, i am now doing some prototypes for my projects which will be dealing with tones of files. After a little scouting i decided to try z3c.extfile. Every thing works fine. But i found it strange that there is no delete feature in z3c.extfile. ie, even if i can delete a ExtFile object, the file in the hash directory is not getting deleted! and it keeps on accumulating... So i thought i 'll add a delete feature... but my __del__() approach doesn't work for me. but i added an additional delete() function too which can be invoked explicitly to delete the file before trying to delete ExtFile object. i made following changes to the source... inside z3c.extfile.file.file.ExtFile, ---------------------------------------------------------------------------------------------- class ExtFile(Persistent): """A zope file implementation based on z3c.extfile""" interface.implements(IExtFile) data = ExtBytesProperty('data') def __init__(self, data='', contentType=''): self.data = data self.contentType = contentType # added the following lines# * def __del__(self): # <- this is not being invoked when i try to delete an extfile object del self.data #print "deleted data via destructor" def delete(self): # <- added this to be able to manually able to delete files del self.data #print "deleted data via delete()" # # # # # # # # # # # # # # # * def getSize(self): return len(self.data) ---------------------------------------------------------------------------------------------- and the 'data' is a 'property' (ExtBytesProperty) so i made following changes to z3c.extfile.property.ExtBytesProperty ---------------------------------------------------------------------------------------------- class ExtBytesProperty(object): """a property which's values are stored as external files""" def __init__(self, name): self.__name = name # added the following lines# * def __delete__(self,inst): digest = inst.__dict__[self.__name] self.hd.delete(digest) * *# # # # # # # # # # # # # # # * @property def hd(self): return component.getUtility(interfaces.IHashDir) def __get__(self, inst, klass): if inst is None: return self digest = inst.__dict__.get(self.__name, _marker) if digest is _marker: return None return getFile(digest) def __set__(self, inst, value): # ignore if value is None if value is None: if inst.__dict__.has_key(self.__name): del inst.__dict__[self.__name] return # Handle case when value is a string if isinstance(value, unicode): value = value.encode('UTF-8') if isinstance(value, str): value = StringIO(value) value.seek(0) f = self.hd.new() while True: chunk = value.read(BLOCK_SIZE) if not chunk: newDigest = f.commit() oldDigest = inst.__dict__.get(self.__name, _marker) if newDigest == oldDigest: # we have no change, so we have to seek to zero # because this is normal behaviour when setting a # new value if hasattr(_storage, 'dataManager'): if newDigest in _storage.dataManager.files: f = _storage.dataManager.files[newDigest] f.seek(0) else: inst.__dict__[self.__name] = newDigest break f.write(chunk) ---------------------------------------------------------------------------------------------------- and at last added the real code which delete the file in hash directory too i added following codes inside z3c.extfile.hashdir.HashDir class --------------------------------------------------- def delete(self,digest): """delete the file""" path=self.getPath(digest) if os.path.exists(path): os.remove(path) return ---------------------------------------------------- Now, everything works fine when i try to delete an ExtFile object in ZODB, __del__() is not being invoked!!!!! can anyone tell me how can i fix this??? thanks in advance jayaraj