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PONSManagedObject fault / cannot get 'primitive' object handled by NSManagedObject
 

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  1. PONSManagedObject fault / cannot get 'primitive' object handled by NSManagedObject
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    <p>I am struggling with CoreData. I'd like to fetch the following object:</p> <pre><code>@interface Email : NSManagedObject { } @property (nonatomic, copy) NSString *email; @property (nonatomic, copy) NSString *contact; @end </code></pre> <p>..and put the result inside a NSMutableArray, but the NSString contents, (not NSManagedObjects!). This is because I am using json-framework and that engine does not allow NSManagedObjects to be passed.</p> <p>These lines fetch perfom the fetch from CoreData</p> <pre><code> NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Emails" inManagedObjectContext:self.managedObjectContext]; [fetchRequest setEntity:entity]; [fetchRequest setPropertiesToFetch:[NSArray arrayWithObject:@"email"]]; NSError *error = nil; NSMutableArray *fetchedObjects = [[NSMutableArray alloc] init]; fetchedObjects= [self.managedObjectContext executeFetchRequest:fetchRequest error:&amp;error]; flight.emails=fetchedObjects; </code></pre> <p>The 'flight' object is declared as follows:</p> <pre><code>@interface Flight : NSObject { NSMutableArray *_emails; } @property (nonatomic, retain) NSMutableArray *emails; </code></pre> <p>With this code I am getting CoreData faults. I tried some other implementation variants, but never actually managed to have NSString objects in flight.emails, but always NSManagedObjects. What I tried was to implement a dedicated getter function in the Email NSManagedObject that copies the fetched NSString and returns the copy. </p> <p>I get the idea that this is kind of a common problem, however, my research has not led to a solution on this one here.</p> <p>Thanks, Peter</p>
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