Stuart 'Zen' Bishop wrote:
Is there a method I can initialize _v_ attributes in? __init__ is only called on initial object creation, but I also need to initialize variables when the object is instantiated from ZODB
Define a __setstate__. This is called when the object is activated (brought into memory from the object store). Here is an example of how Catalog wakes up: def __setstate__(self, state): """ initialize your brains. This method is called when the catalog is first activated (from the persistent storage) """ Persistent.__setstate__(self, state) self.useBrains(self._v_brains) if not hasattr(self, 'lexicon'): self.lexicon = Lexicon() There are a couple things going on here, first, the Persistence machinery is fired up (your object must subclass Persistent, of course), second useBrains() initializes the default record class for catalog result records. third, 'self.lexicon' was added to Catalog in this beta release, so everyone's old 2.0 Catalogs do not contains lexicons. By checking for the attr in setstate, you can evolve your objects to contain new components and attributes. You can also add a class attribute, of course. -Michel
___ // Zen (alias Stuart Bishop) Work: zen@cs.rmit.edu.au // E N Senior Systems Alchemist Play: zen@shangri-la.dropbear.id.au //__ Computer Science, RMIT WWW: http://www.cs.rmit.edu.au/~zen
_______________________________________________ Zope-Dev maillist - Zope-Dev@zope.org http://lists.zope.org/mailman/listinfo/zope-dev No cross posts or HTML encoding! (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )