PredicateFormat

NSString *predicateFormatString = [NSString stringWithFormat:@"(%@ = '%@' OR %@ = '%@') AND (%@ = '%@' OR %@ = '%@')",
                                kMessageUserSendIdKey, self.currentUser.objectId,
                                kMessageUserSendIdKey, self.userChat.objectId,
                                kMessageUserReceiveIdKey, self.currentUser.objectId,
                                kMessageUserReceiveIdKey, self.userChat.objectId];