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copied!<p>I'm attempting to load data from an undocumented API (OsiriX).</p> <p>Getting the NSManagedObject like this: <code>NSManagedObject *itemStudy = [[BrowserController databaseOutline] itemAtRow: [[BrowserController databaseOutline] selectedRow]];</code></p> <p>works just fine.</p> <p>But getting the NSManagedObject like this: <code>seriesArray = [_context executeFetchRequest:request error:&error]; NSManagedObject *itemSeries = [seriesArray objectAtIndex:0];</code></p> <p>Generates an error when I call <code>[itemSeries valueForKey:@"type"]</code></p> <p><code>2010-05-27 11:04:48.178 rcOsirix[27712:7b03] Exception: [<NSManagedObject 0xd30fd0> valueForUndefinedKey:]: the entity Series is not key value coding-compliant for the key "type".</code></p> <p>This confuses me thoroughly. If I print the KVC values for itemSeries I get this list:</p> <pre><code>2010-05-27 11:04:48.167 rcOsirix[27712:7b03] KVC comment 2010-05-27 11:04:48.168 rcOsirix[27712:7b03] KVC date 2010-05-27 11:04:48.168 rcOsirix[27712:7b03] KVC dateAdded 2010-05-27 11:04:48.169 rcOsirix[27712:7b03] KVC dateOpened 2010-05-27 11:04:48.169 rcOsirix[27712:7b03] KVC displayStyle 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC id 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC modality 2010-05-27 11:04:48.170 rcOsirix[27712:7b03] KVC name 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC numberOfImages 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC numberOfKeyImages 2010-05-27 11:04:48.171 rcOsirix[27712:7b03] KVC rotationAngle 2010-05-27 11:04:48.172 rcOsirix[27712:7b03] KVC scale 2010-05-27 11:04:48.172 rcOsirix[27712:7b03] KVC seriesDICOMUID 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesDescription 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesInstanceUID 2010-05-27 11:04:48.173 rcOsirix[27712:7b03] KVC seriesSOPClassUID 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC stateText 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC thumbnail 2010-05-27 11:04:48.174 rcOsirix[27712:7b03] KVC windowLevel 2010-05-27 11:04:48.175 rcOsirix[27712:7b03] KVC windowWidth 2010-05-27 11:04:48.175 rcOsirix[27712:7b03] KVC xFlipped 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC xOffset 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC yFlipped 2010-05-27 11:04:48.176 rcOsirix[27712:7b03] KVC yOffset 2010-05-27 11:04:48.177 rcOsirix[27712:7b03] KVC mountedVolume 2010-05-27 11:04:48.177 rcOsirix[27712:7b03] KVC study 2010-05-27 11:04:48.178 rcOsirix[27712:7b03] KVC images </code></pre> <p>The KVC for itemStudy is this:</p> <pre><code>2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC accessionNumber 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC comment 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC date 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateAdded 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateOfBirth 2010-05-27 10:46:40.336 OsiriX[27266:a0f] KVC dateOpened 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC dictateURL 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC expanded 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC hasDICOM 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC id 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC institutionName 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC lockedStudy 2010-05-27 10:46:40.337 OsiriX[27266:a0f] KVC modality 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC name 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC numberOfImages 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientID 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientSex 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC patientUID 2010-05-27 10:46:40.338 OsiriX[27266:a0f] KVC performingPhysician 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC referringPhysician 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC reportURL 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC stateText 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC studyInstanceUID 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC studyName 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC windowsState 2010-05-27 10:46:40.339 OsiriX[27266:a0f] KVC albums 2010-05-27 10:46:40.340 OsiriX[27266:a0f] KVC series </code></pre> <p>If I use code:</p> <pre><code>NSDictionary *props = [[item entity] propertiesByName]; for (NSString *s in [props allKeys]) { NSLog(@"KVC %@", s); } </code></pre> <p>Yet <code>itemStudy</code> throws no error if I call <code>[itemStudy valueForKey:@"type"]</code> when it should because there's no KVC for <code>@"type"</code>!!! </p> <p>Granted, the objects are different but neither of them contain the key <code>@"type"</code> and they both should throw errors, yet the Osirix code Tests for both conditions:</p> <pre><code>if ([[item valueForKey:@"type"] isEqualToString:@"Series"]) { ... } if ([[item valueForKey:@"type"] isEqualToString:@"Study"]) { ... } </code></pre> <p>And throws no errors. Yet when I load an <code>NSManagedObject</code> of the same exact model and entity <code>@"Series"</code> it throws the 'no key value' when passed into the conditions above.</p> <p>Am I missing something? Both the <code>superentity</code> and <code>subentities</code> of itemSeries and itemStudy are <code>nil</code> so they don't inherit from something that has KVC <code>@"type"</code>.</p> <p>I'm totally at a loss as to explain what is going on.</p> <p>--- EDIT ---</p> <p>I know no one can explain what is going on... but maybe where to start looking? How would itemStudy have the extra KVC @"type" that doesn't show up in it's property list?</p> <p>Thank you for your assistance,</p> <p>-Stephen</p> <p>--- EDIT ---</p> <p>OK so after digging around more I think this is a CoreData misunderstanding on my part.</p> <p>The API includes the classes <code>DicomSeries</code> and <code>DicomStudy</code> which are subclasses of NSManagedObject and are included in the xcdatamodel file.</p> <p>I am including the xcdatamodel file as a "compiled source" and DicomSeries.h and DicomStudy.h</p> <p><code>DicomSeries</code> and <code>DicomStudy</code> are "hard-coded" with:</p> <pre><code>- (NSString*) type { return @"Series"; } </code></pre> <p>But the objects I create for <code>itemStudy</code> Never call this method. Objects created like <code>itemStudy</code> above, do. Even <code>DicomSeries</code> objects called within the main program do. But not ones that I make with the fetch request from the same database.</p> <p>Even if I do:</p> <pre><code>DicomSeries *itemSeries = [_context executeFetchRequest:request] </code></pre> <p>Where the request has entity <code>@"Series"</code> which is of Class <code>DicomSeries</code> so it SHOULD respond to:</p> <pre><code>[itemSeries valueForKey:@"type"]; </code></pre> <p>but it doesn't.</p> <p>I feel like there's a big giant gap of CoreData I'm missing. My <code>NSManagedObjectModel</code> that I'm using in my persistent Store Coordinator and my context has Entities for <code>Series</code> and is of <code>managedObjectClassName</code> <code>DicomSeries</code> so...</p> <p>yeah.</p> <p>lol, wut?</p>

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