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Clear all objects from an entity

/ Published in: Objective C
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How do you delete all objects in an entity in Core Data? It's not as simple or straightforward as it is in SQL/SQLite. here's one reasonably quick way...

taken from stackoverflow

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  1. - (BOOL)clearEntity:(NSString *)entity
  2.     NSManagedObjectContext *myContext = [(<#YourAppDelegate#> *)[[NSApplication sharedApplication] delegate] managedObjecContext];
  3.     NSFetchRequest *fetchLLObjects = [[NSFetchRequest alloc] init];
  4.     [fetchAllObjects setEntity:[NSEntityDescription entityForName:entity inManagedObjectContext:myContext]];
  5.     [fetchAllObjects setIncludesPropertyValues:NO]; //only fetch the managedObjectID
  6.  
  7.     NSError *error = nil;
  8.     NSArray *allObjects = [myContext executeFetchRequest:fetchAllObjects error:&error];
  9.     // uncomment next line if you're NOT using ARC
  10.     // [allObjects release];
  11.     if (error) {
  12.         [[NSApplication sharedApplication] presentError:error];
  13.     }
  14.  
  15.     for (NSManagedObject *object in allObjects) {
  16.         [myContext deleteObject:object];
  17.     }
  18.  
  19.     NSError *saveError = nil;
  20.     if (![myContext save:&saveError]) {
  21.         [[NSApplication sharedApplication] presentError:error];
  22.     }
  23.  
  24.     return (saveError == nil);
  25. }

URL: http://stackoverflow.com/a/1383645/215494

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