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Editorial Team
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Asked: 2026-05-15T05:13:32+00:00

From the Core Data docs: A property name cannot be the same as any

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From the Core Data docs:

A property name cannot be the same as
any no-parameter method name of
NSObject or NSManagedObject—for
example, you cannot give a property
the name “description”

Ok, so -description is blocked for property names. I guess it’s because of KVC. But what exactly does “no-parameter” mean? Is that any method which does not take a parameter?

So in other words:

  • Any property of NSObject or NSManagedObject
  • ANY method name of NSObject or NSManagedObject, which does not take a parameter

Did I get that right?

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1 Answer

  1. Editorial Team

    Any unary message is a no parameter method name. I.e., -copy, -retain, -release, are all unary messages when sent, and no parameter methods when you define them. An example of a keyword message (or a method with parameters) is: +stringWithString:, etc.

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