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POXcode4: Different code generated for custom core data managed objects
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copied!<p>Now that Xcode4 is publicly available I'm moving this question out of Apple's secret dev forum:</p> <p>Can someone explain why the code generated in the following procedure is different than in Xcode3? Is the code better or might this be a bug?</p> <p>I use Core Data custom managed classes and this was the procedure I followed in Xcode3:</p> <ol> <li>Go to the model editor</li> <li>Select the entity you wish to generate source code for</li> <li>Go to File->New->New Files</li> <li>Choose managedobject class (or whatever it was, I can't open xcode3 anymore to verify)</li> <li>Select entities you wish to generate (the previously selected entity in step 2 is checked off)</li> <li>Click Finish</li> </ol> <p>Now, in Xcode4, I THINK this is how to do it, but I'm not sure because it generates different code:</p> <ol> <li>Go to model editor</li> <li>Select entity</li> <li>Go to File->New->New File</li> <li>Choose "NSManagedObject subclass"</li> <li>Choose location and create.</li> </ol> <p>The code it is generating is different for a number of reasons:</p> <ol> <li>The generated code for adding and removing members of a set in the entity are no longer declared in the @interface, but instead @implementation. This causes code sense to fail detecting these methods.</li> <li>The same generated code for adding and removing objects is now fully defined, no longer autogenerated using CoreDataGeneratedAccessors</li> </ol> <p>For example, Xcode3 would have generated this code in the HEADER file:</p> <pre><code>@interface SampleEntity (CoreDataGeneratedAccessors) - (void)addChildObject:(Child *)value; - (void)removeChildObject:(Child *)value; - (void)addChild:(NSSet *)value; - (void)removeChild:(NSSet *)value; @end </code></pre> <p>Now, Xcode4 generates this code in the IMPLEMENTATION file:</p> <pre><code>@implementation SampleEntity @dynamic children; - (void)addChildObject:(Child *)value { NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; [self willChangeValueForKey:@"children" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; [[self primitiveValueForKey:@"children"] addObject:value]; [self didChangeValueForKey:@"children" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; [changedObjects release]; } </code></pre> <p>Can someone weigh in on why this is different? Xcode4 code sense does not like this new way of generating NSManagedObject subclasses.</p>

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