[black bear theory]

i am working on an NSFormatter subclass that can handle a number of my classes. i have a mutable array that holds three types of data: vector, lineation and plane. plane extends lineation and lineation extends vector, however when i iterate through the array calling [object class] always returns vector, even if it is a lineation or plane. any ideas on why this is happening?

calling [object description] returns the format for vector string as well.

thanks,

[Chuckit]

Post your code. It sounds like you're doing something wrong, and you'll be pretty lucky if somebody just happens to guess what it is.

[black bear theory]

ugh, my mac is not networked (on a PC now) so posting the code is not possible, but here is some more info.

VectorFormatter basically takes and makes Vectors with i, j, k variables that have the form "<i j k>". OrientationFormatter extends VectorFormatter and should format planes and lineations (which extend vector) differently.

Code:
-(NSString *)stringForObject:(id)object {
NSLog(@"class %@", [object class]);
if([object isKindOfClass:[AKLineation class]]) {
retirn [object description]; // if lineation
} else {
NSLog(@"defaulting on %@",[object description]);
return [super stringForObjectValue:object];
}
return [NSString stringWithFormat:@"error"];
}

when i start the program i have 10 instances of vector, plane and orientation added to the mutable array and the output always says

Code:
class Vector
defaulting on <3 4 5>
class Vector 
defaulting on <1 2 9>
...

i have the array bound to an array controller with default class Lineation and when i add a new one, it uses the vector notation, not the required format.

i have -(NSString *)description over-ridden in each class and i call each one in the init, and the display is fine, only when it is being displayed in the tableview does it default to vector notation.

[black bear theory]

found the problem.

basically i had to find a way to display the model data "<3 0 4>" and the length "5" in the same tableview and hacked a way to send a copy of the model data to the transformer and then the length to the second column. had to create a new Vector (the one being displayed) to send to the object while the model didn't change. this was the vector that was being seen by the transformer. i've changed it so it works for each subclass and returns a copy of each subclass.

any way to use bindings to send a "self" key to get a copy of the model data?