Core data fetch function

Fetch core data entity

+(NSArray*)fetchForCardsEntity:(NSString*)entityName withPredicate:(NSString*)predicateFormat withSortDiscriptor:(NSString*)sortdDscriptorName{
    NSManagedObjectContext *moc=[[self appDelegate] managedObjectContext];
    NSEntityDescription *entityDescription;
    NSPredicate *predicate;
    
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    entityDescription = [NSEntityDescription entityForName:entityName inManagedObjectContext:moc];
    [request setEntity:entityDescription];
    
    predicate = [NSPredicate predicateWithFormat: predicateFormat];
    [request setPredicate:predicate];
    
    if (sortdDscriptorName) {
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc]
                                        initWithKey:sortdDscriptorName ascending:YES];
    [request setSortDescriptors:[NSArray arrayWithObject:sortDescriptor]];
    [sortDescriptor release];
    }
    
    NSError *error = nil;
    NSArray * requestArray =[moc executeFetchRequest:request error:&error];
    if (requestArray == nil)
    {
        // Deal with error...
    }
    [request release];
    return requestArray;
    
}