[Zope] Bound methods, acquisition, __init__, Unpickleable object

[Bo Granlund]

Hello zope users,

I have this little problem with bound methods and __init__. I have
written something like:

class Root(Acquisition.Implicit, Persistent):
	def __init__(self):
		self.container = []
	def register_func(self, func):
		self.container.append(func)

class Spam(Acquisition.Implicit, Persistent):
	def foo(self): pass
	def __init__(self):
		# This fails at Root.register_func, in self.container.append
		self.register_func(self.foo)
	def add_bound_method(self):
		# Works like charm, when called explicitly
		self.register_func(self.foo)

This results in UnpickleableError, 'Cannot pickle objects' when
adding the product. Now if I call register_func from somewhere
else than __init__ or manage_afterAdd, there is no problem, and
everything works as I expect it to work. This is propably
explained somewhere in deep detail, and I have managed to miss
that documentation. Any pointers to documentation or ideas on
how to set bound methods to other objects would be appreciated.

Best regards,
Bo Granlund