Hi Thanks
Yeah the keys are ints and this helps a lot.
Thanks again...
On 22 apr 2010, at 18:31, Reinhard Segeler wrote:
> Hi,
>
> correct me if I'm wrong, but what you're doing is a calculation with the
> pointers ( * of NSNumber) not the values. You have to calculate it like this:
>
> NSInteger fieldOne = [ [ managedObject valueForKey:@"key1"] intValue]; //
> if it's an integer
> NSInteger fieldTwo = [ [ managedObject valueForKey:@"key2"] intValue];
> NSInteger fieldThree = [ [ managedObject valueForKey:@"key3"] intValue];
>
> if ( fieldTwo > 0 )
> {
> NSNumber *answer = [ NSNumber numberWithInt:fieldTwo - fieldOne +
> fieldThree];
> [ self.managedObject setValue:answer forKey:@"key4"];
> // maybe you need to this instead
> [ self.managedObject setValue:[ answer stringValue] forKey:@"key4"];
> }
>
> Don't know if intValue in this context works, if not then use this
> alternative, which must work in any way:
>
> Your code and change the following lines:
>
> NSNumber *answer = [ NSNumber numberWithInt: [fieldTwo intValue] - [fieldOne
> intValue] + [fieldThree intValue] ];
>
> [ self.managedObject setValue:answer forKey:@"key4"];
> //or
> [ self.managedObject setValue:[ answer stringValue] forKey:@"key4"];
> //stringValue to present it in a textfield
>
> Hope that helped... MacMeideln
>
> Am 22.04.2010 um 17:36 schrieb Arnold Nefkens:
>
>> Hello list,
>>
>> Im quite new, and probably missing something.
>>
>> I want to do a calculation of three fields inside of a entity in CoreData.
>>
>> Below is the code, what is wrong?
>>
>> NSNumber *fieldOne = [managedObject valueForKey:@"key1"];
>> NSNumber *fieldTwo = [managedObject valueForKey:@"key2"];
>> NSNumber *fieldThree = [managedObject valueForKey:@"key3"];
>> if (fieldTwo > 0) {
>> NSNumber *answer = ((fieldTwo - fieldOne) + fieldThree);
>> [self.managedObject setValue:[answer intValue] forKey:@"key4"];
>> }
>>
>> If I debug the right values are being shown in the fieldOne, fieldTwo and
>> fieldThree. But the calculation answer is all the time out of scope.....
>>
>> What am I missing?
>>
>> hope someone can help...
>>
>> Arnold Nefkens_______________________________________________
>>
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