Created
January 17, 2011 09:02
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NSFetchRequest *request = [[NSFetchRequest alloc] init]; | |
NSEntityDescription *entity = [NSEntityDescription entityForName:@"YourEntityName" inManagedObjectContext:managedObjectContext]; | |
[request setEntity:entity]; | |
// retrive the objects with a given value for a certain property | |
NSPredicate *predicate = [NSPredicate predicateWithFormat: @"property == %@", value]; | |
[request setPredicate:predicate]; | |
// Edit the sort key as appropriate. | |
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"yourSortKey" ascending:YES]; | |
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; | |
[request setSortDescriptors:sortDescriptors]; | |
// Edit the section name key path and cache name if appropriate. | |
// nil for section name key path means "no sections". | |
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"]; | |
aFetchedResultsController.delegate = self; | |
NSError *error = nil; | |
NSArray *result = [managedObjectContext executeFetchRequest:request error:&error]; | |
[request release]; | |
[sortDescriptor release]; | |
[sortDescriptors release]; | |
if ((result != nil) && ([result count]) && (error == nil)){ | |
return [NSMutableArray arrayWithArray:result]; | |
} | |
else{ | |
YourEntityName *object = (YourEntityName *) [NSEntityDescription insertNewObjectForEntityForName:@"YourEntityName" inManagedObjectContext:self.managedObjectContext]; | |
// setup your object attributes, for instance set its name | |
object.name = @"name" | |
// save object | |
NSError *error; | |
if (![[self managedObjectContext] save:&error]) { | |
// Handle error | |
NSLog(@"Unresolved error %@, %@", error, [error userInfo]); | |
} | |
return object; | |
} |
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