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copied!<blockquote> <pre><code>Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath entity.isTemporaryID not found in entity <NSSQLEntity Cocktail id=4>' </code></pre> <p>How can one execute the equivalent of [[cocktail objectID] isTemporaryID] in an NSPredicate?</p> </blockquote> <p>Do that.</p> <p>What you asked for is not <code>[[cocktail objectID] isTemporaryID]</code>, it's <code>[[cocktail entity] isTemporaryID]</code>. If you want <code>objectID</code> (which you do, since you want to ask it whether it's a temporary ID), then that's what you need to ask for in your key path.</p> <p>You should read the <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/KeyValueCoding/" rel="nofollow noreferrer">Key-Value Coding Programming Guide</a>, even if you've read it already, and look up the <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSManagedObject_Class/Reference/NSManagedObject.html#//apple_ref/occ/instm/NSManagedObject/entity" rel="nofollow noreferrer"><code>entity</code></a> and <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSManagedObject_Class/Reference/NSManagedObject.html#//apple_ref/occ/instm/NSManagedObject/objectID" rel="nofollow noreferrer"><code>objectID</code></a> methods in <a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSManagedObject_Class/Reference/NSManagedObject.html" rel="nofollow noreferrer">the NSManagedObject reference</a>. From these, you'll find it clear that Marcus Zarra either mixed the two up or meant <code>objectID</code> but typed <code>entity</code> by accident. It happens to everyone—that's why it's good to always check the docs.</p>

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