On Jan 30, 2009, at 5:23 AM, Devraj Mukherjee wrote:
I have two classes DomainLogicBase and Vehicle where Vehicle inherits
from DomainLogicBase [...]
I am adding objects of type Vehicle to an NSMutableArray which are
read up from disk from an SQLite database.
How are you storing/reading them? Are you sure they are complete and
valid at this point?
When I try and get the object back out of the NSMutableArray and
access its properties my app crashes. I have tried to use the debugger
and the best I can tell is the properties seem to have invalid values.
If the model class does not inherit from a custom class I have defined
then the app works fine.
Is there something I am missing? Does inheritance do funny things when
I am adding objects of the children class to a collection?
No, inheritance doesn't do "funny things" when you add the objects to
a collection.
Is DomainLogicBase derived, directly or indirectly, from NSObject?
You might have accidentally forgotten to specify its super class, thus
inadvertently making it a root class.
If that's not it, then I suspect memory management problems. You
might be over-releasing the objects and the memory is later reused for
some other kind of object. Try turning on NSZombieEnabled.
Regards,
Ken
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