A generic core data function to check whether a record already exists

gistfile1.m

/*
 * Useful function to check whether a record already exists
 */
-(BOOL)doesRecordExistForEntity:(NSString *)entity fieldToCheck:(NSString *)fieldName valueToMatch:(id)val
{
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"(%K = %@)", fieldName, val];
    //NSLog(@"(P: %@)", [pred predicateFormat]);
    NSArray *arr = [self queryDBForEntity:entity predicate:pred sortByField:fieldName];
    //NSLog(@"%@", arr);
    return ([arr count] > 0);
}