Charlie Clark wrote:


Am 28.11.2007 um 14:03 schrieb Charlie Clark:

class Grid(dict, PortalContent)
...

TypeError: Error when calling the metaclass bases multiple bases have instance lay-out conflict


Looks like using the old favourite UserDict solve the incompatability problem.

class Grid(UserDict, PortalContent):
...


Right. You can't mix built-in types with ExtensionClasses (pretty much anything in Zope 2 is an ExtensionClass). Actually, subclassing the built-in types usually only works for trivial cases.

UserDict (or PersistentDict) is the right thing to use here.

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