how to write an If statement, to compare core data attribute value?

Question

i'm an objective-c newcomer.

im trying to compare a core data entity attribute value and having trouble with the syntax. i just want to know the best way way to write the if statement to compare values.

in this example, the someAttribute attribute is a boolean, and its default is NO.

NSString *myValue = [NSString stringWithFormat:@"%@", myObject.someAttribute];
if ([myValue isEqualToString:@"1"]) {
 // do something 
} else {
 // do something else
}

is this the right way? i've tried other flavors, like below, but the results aren't accurate:

if (myObject.someAttribute == 1) {
if (myObject.someAttribute) {

Answer 1

If your attribute is of BOOL type, this code will work fine

if(myObject.someAttribyte){
    //so smth if someAttribute is YES
}

Answer 2

If you look in the generated header for this entity, there's a good chance that the actual type of the property is not BOOL, but NSNumber, which is how Cocoa boxes numeric types into objects. Assuming I'm right, you might try:

if ([myObject.someAttribute boolValue]) { ... }

Answer 3

You can't convert a BOOL directly to a string.

Predicates are the preferred method of comparing CoreData values. It's more complicated to start but works better in the long run. See NSPredicate programming guide