Question

I still muck up with bool’s in my core data config data. The NSManagedObject for say a core data “config” class one can quickly type in the following and you don’t get an error:

  if (self.myCoreDataConfigObject.isOn) { ...

but it doesn’t give the correct result as what is required is the conversion from NSNumber to a bool:

  if ([self.myCoreDataConfigObject.isOn boolValue]) { ...

Question – Any tips/tricks on how to avoid this? It would be great if XCode would show a warning in this case…

Answer 1

You could rename the field to something like isOnValue and then provide an accessor on your NSManagedObject subclass called isOn that runs the -boolValue conversion for you.

Don’t forget, however, that “optional” values may be nil and you may care about this as something distinct than NO.