On Jul 22, 2010, at 13:03, Amy Gibbs wrote:
> I've tried declaring all sorts of things trying to get it to work :D float,
> decimal, (the entity properties are decimal in the datamodel), NSNumber, but
> I still get the error: invalid operands to binary /
>
> I assume I can't use int as the figures aren't integers, I only need it to 2
> decimal places (for currency).
You're missing the distinction between an object and a scalar value.
'valueForKey' returns an object (presumably a NSNumber), but '/' needs scalars.
So, you need something along this line:
NSNumber* price = [Product valueForKey:@"UOMcost"];
NSNumber* uom = [Product valueForKey:@"purchaseUOM"];
double result = [uom doubleValue] / [price doubleValue];
NSNumber* cost = [NSNumber numberWithDouble: result];
[Product setValue: cost for Key: ...];
Incidentally, if you're dealing with currency, it's better to use integers (the
number of cents, rather than the number of dollars, essentially) rather than
floating point.
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