Parse.com从相关的PFObject获取PFUser

Question

我将照片保存为Parse作为PFObject,并将[PFUser currentUser]用户ID作为其键之一.

我想在表格视图中显示照片以及PFUser的详细信息.但是当我试图让用户 - PFUser *user = [self.photo objectForKey:@"user"];然后尝试访问用户的显示名称时,我得到以下异常:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'Key "profilePicture" has no data.  Call fetchIfNeeded before getting 
its value.'

但是,调用fetchIfNeeded会使表崩溃,并且AnyPic教程正是在我不使用fetchIfNeeded的情况下完成的.AnyPic只是打电话PFUser *user = [self.photo objectForKey:@"user"];,一切正常.

我在某处错过了一步吗？谢谢!

这是cellForRowAtIndexPath:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
    static NSString *CellIdentifier = @"Cell";

    PhotoCellTest *cell = (PhotoCellTest *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[PhotoCellTest alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier descriptionText:nil userNameText:nil captionText:nil];
    }

    photo = object;
    PFUser *user = [self.photo objectForKey:@"user"];
    PFFile *profilePictureSmall = [user objectForKey:@"profilePicture"];
    cell.profilePicPlaceholder.file = profilePictureSmall;



    return cell;
}

编辑

这是我为PFObject设置键的地方:

PFObject *photo = [PFObject objectWithClassName:@"Photo"];
    [photo setObject:[PFUser currentUser] forKey:@"user"];
    [photo setObject:self.photoFile forKey:@"image"];
    [photo setObject:[nameField text] forKey:@"itemCaption"];

这里是我为PFUser设置键的地方:

PFFile *profilePic = [PFFile fileWithData:data];
    [[PFUser currentUser] setObject:profilePic forKey:@"profilePicture"];
    [[PFUser currentUser] saveInBackground];

当我NSLog时user,我只能得到<PFUser:nOpK5splEX:(null)> { },但是当我在NSLog时[PFUser currentUser],我得到<PFUser:nOpK5splEX:(null)> { displayName = "XXX"; facebookId = XXX; profilePicture = "<PFFile: XXX>"; username = XXX;}......显然PFUser没有正确设置.

我是否应该在数据库中做一些事情来链接用户字段或类似的东西？

Answer 1

明白了 - 我没有includeKey在PFQuery中使用它.