Bulk update data in iOS 7 CoreData

Question

Is there way to run updating of all objects for some entity by one SQL-query? Not to fetch and run-looping.

For example like to run

UPDATE someEntity SET filed1 = value1 WHERE field2 = value2

Answer 1

Mercelo's answer will not work for iOS-7 for this you can

NSFetchRequest *fetchAllRSSItems = [NSFetchRequest fetchRequestWithEntityName:[RSSItem entityName]];
NSError *fetchError;
NSArray *results = [self.managedObjectContext executeFetchRequest:fetchAllRSSItems error:&fetchError];

if (results == nil) {

    NSLog(@"Error: %@", [fetchError localizedDescription]);
} else {

    for (RSSItem *rssItem in results) {
        rssItem.read = [NSNumber numberWithBool:YES];
    }

    [self saveManagedObjectContext];
}