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Editorial Team
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Asked: 2026-05-18T05:30:53+00:00

Say you have a Core Data object called Workshop. It has a to-many relationship

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Say you have a Core Data object called Workshop. It has a to-many relationship to a Student object.

How would I create an NSArray of the students within the Workshop?

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1 Answer

  1. Editorial Team

    It’s a NSSet opposed to an array, as they are unordered.

    Use mutableSetValueForKey: This
    returns a proxy that mutates the
    relationship and does KVO
    notifications. Think of the name as
    “[NS]MutableSet” “valueForKey” rather
    than “mutableSetValue” “forKey”,
    because it returns a mutable set that
    you manipulate

    NSMutableSet *Students;
Students = [Workshop mutableSetValueForKey: @"Students"];
[Students addObject: newStudent];
[Students removeObject: oldStudent];

    source

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