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3107556
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2010-06-24T06:04:53.133
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2010-06-24T08:18:54.043
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2010-06-24T08:18:54.043
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<p>This is my attempt. N.B. the Book Entity inherits from NSManagedObject.</p> <pre><code>NSPredicate *predicate = [NSPredicate predicateWithFormat: @"isbn ==9780786660506"]; Book *book = (Book*) [CoreDataHelper getEntityFromFetchedResultsController:@"Book" :predicate :nil :YES :application.managedObjectContext]; if (book !=nil) NSLog(@"book entity %@",book.title); </code></pre> <p>Bang this in a static helper class called CoreDataHelper</p> <pre><code>+ (NSManagedObject*)getEntityFromFetchedResultsController: (NSString*) entityName : (NSPredicate *) predicate : (NSString*) sortKey : (BOOL) sortAscending : (NSManagedObjectContext *) managedObjectContext { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:entityName inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; [request setFetchLimit:1]; // If a predicate was passed, pass it to the query if(predicate != nil) { [request setPredicate:predicate]; } // If a sort key was passed, use it for sorting. if(sortKey != nil) { NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:sortKey ascending:sortAscending]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; [request setSortDescriptors:sortDescriptors]; [sortDescriptors release]; [sortDescriptor release]; } NSError *error; NSMutableArray *mutableFetchResults = [[[managedObjectContext executeFetchRequest:request error:&error] mutableCopy] autorelease]; if (error !=nil){ NSLog(@"error %@", error); } if ([mutableFetchResults count] >0) { NSManagedObject *firstObject = [mutableFetchResults objectAtIndex:0]; return firstObject; }else { return nil; } } </code></pre>
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1. POHow to fetch only the first record in Core Data?
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1. USjohndpope
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