CBLModelでUpdate

gistfile1.m

- (void)updateDocument:(NSIndexPath *)indexPath{
   
    // check情報を取得
    ShoppingItem *item = dataArray[indexPath.row];
   
    // Updateを準備する
    NSError *err;
    item.check = !item.check;
   
    BOOL ok = [item save:&err];
   
    if (ok) {
        [table reloadData];
    }
    else{
        [self showErrorAlert: @"Couldn't update the item"];
    }
}