Search code examples
iphoneiosipadcore-datapredicate

How to write a BOOL predicate in Core Data?

I have an attribute of type BOOL and I want to perform a search for all managed objects where this attribute is YES.

For string attributes it is straightforward. I create a predicate like this:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"userName = %@", userName];

But how do I do this, if I have a bool attribute called selected and I want to make a predicate for this? Could I just do something like this?

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"selected = %@", yesNumber];

Or do I need other format specifiers and just pass YES?

Solution

  • From Predicate Programming Guide:

    You specify and test for equality of Boolean values as illustrated in the following examples:

    NSPredicate *newPredicate = [NSPredicate predicateWithFormat:@"anAttribute == %@", [NSNumber numberWithBool:aBool]];
NSPredicate *testForTrue = [NSPredicate predicateWithFormat:@"anAttribute == YES"];

    You can also check out the Predicate Format String Syntax.