"""
This adds some usefull conveniences to NSManagedObject and subclasses thereof

These conveniences try to enable KVO by default on NSManagedObject instances,
this no longer works on Leopard due to the way NSManagedObject is implemented
there (it generates accessor methods at runtime, which interferes with the
implementation in this file).
"""
__all__ = ()
from objc import addConvenienceForClass
from Foundation import NSObject

def NSMOsetValue_ForKey_(self, name, value):
    try:
        if '__objc_python_subclass__' in self.__class__.__dict__:
            super(self.__class__, self).setValue_forKey_(value, name)
        else:
            self.setValue_forKey_(value, name)

    except KeyError, msg:
        NSObject.__setattr__(self, name, value)


def NSMOgetValueForKey_(self, name):
    try:
        if '__objc_python_subclass__' in self.__class__.__dict__:
            return super(self.__class__, self).valueForKey_(name)
        else:
            return self.valueForKey_(name)
        
    except KeyError, msg:
        raise AttributeError(name)

addConvenienceForClass('NSManagedObject', (
    ('__setattr__', NSMOsetValue_ForKey_),
    ('__getattr__', NSMOgetValueForKey_),
))