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objective-ccore-datamagicalrecord

getting core data object by boolean property

How can I get an object by a BOOL property? For example, if I have a custom object with a BOOL property completed, how can I get only the ones where completed = true? I'm using Magical Record

[CustomObject MR_findByAttribute:@"completed" withValue:true];
Solution

  • The searchValue argument of MR_findByAttribute:withValue: must be a reference to an object, but true is not a reference to an Objective-C object. It is a “primitive” value. You must wrap it in an NSValue object.

    Also, in Objective-C we normally use the constants YES and NO as the boolean constants.

    You can get an NSValue wrapper for YES just by saying @YES, so try this:

    NSArray *completedObjects = [CustomObject MR_findByAttribute:@"completed"
    withValue:@YES];