ios - Parse.com - 保存新 PFObject 时出现错误 101

Question

我正在创建一个新的 PFObject，在其上设置一些对象，然后像这样保存它:

// Add a new 'madeTitle' Activity Object
PFObject* madeTitleActivity = [PFObject objectWithClassName:kPAPActivityClassKey];
[madeTitleActivity setObject:aComment forKey:kWSActivityCommentKey];
[madeTitleActivity setObject:self.photo forKey:kPAPActivityPhotoKey];
[madeTitleActivity setObject:[PFUser currentUser] forKey:kPAPActivityFromUserKey];
[madeTitleActivity setObject:[aComment objectForKey:kWSCommentsFromUserKey] forKey:kPAPActivityToUserKey];
[madeTitleActivity setObject:kPAPActivityTypeMadeTitle forKey:kPAPActivityTypeKey];

// ACL's
PFACL *ACL = [PFACL ACLWithUser:[PFUser currentUser]];
[ACL setPublicReadAccess:YES];
[ACL setWriteAccess:YES forUser:[PFUser currentUser]];
madeTitleActivity.ACL = ACL;


[madeTitleActivity saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {

    if (succeeded) {
        // ...
    }
    else {
        NSLog(@"madeTitleActivity saveInBackgroundWithBlock -- error = %@", error);
    }
}];

但我收到以下错误:

2013-10-22 10:55:12.546 WSPhoto[2064:7b4b] Error: object not found for update (Code: 101, Version: 1.2.6)
2013-10-22 10:55:12.552 WSPhoto[2064:707] madeTitleActivity saveInBackgroundWithBlock -- error = Error Domain=Parse Code=101 "The operation couldn’t be completed. (Parse error 101.)" UserInfo=0x8966c0 {code=101, error=object not found for update}

我之前处理过这个错误，但它一直与更新对象和 ACL 问题有关。创建和保存新对象时，我没有出现此错误代码。

我检查了我设置的所有对象，它们都返回有效对象。

我还成功地保存了一些其他 Activity 对象，据我所知代码看起来完全一样。

---

编辑:扩展代码，包括嵌套 madeTitleActivity 代码的 CloudCode 函数调用

 [PFCloud callFunctionInBackground:@"setCommentIsTitle"
                   withParameters:@{@"userID":[[PFUser currentUser] objectId],
                     @"objectId":[aComment objectId],
                     @"photoObjectId":[self.photo objectId],
                     @"previousCommentObjectId":[previousTitleComment objectId],
                     @"isTitle":[NSNumber numberWithBool:YES],
                     @"previousCommentObjectIsTitle":[NSNumber numberWithBool:NO]}
                                block:^(NSMutableDictionary *results , NSError *error) {

    if (!error) {
        // Add a new 'madeTitle' Activity Object
        PFObject* madeTitleActivity = [PFObject objectWithClassName:kPAPActivityClassKey];
        [madeTitleActivity setObject:aComment forKey:kWSActivityCommentKey];
        [madeTitleActivity setObject:self.photo forKey:kPAPActivityPhotoKey];
        [madeTitleActivity setObject:[PFUser currentUser] forKey:kPAPActivityFromUserKey];
        [madeTitleActivity setObject:[aComment objectForKey:kWSCommentsFromUserKey] forKey:kPAPActivityToUserKey];
        [madeTitleActivity setObject:kPAPActivityTypeMadeTitle forKey:kPAPActivityTypeKey];

        // ACL's
        PFACL *madeTitleACL = [PFACL ACLWithUser:[PFUser currentUser]];
        [madeTitleACL setPublicReadAccess:YES];
        [madeTitleACL setWriteAccess:YES forUser:[PFUser currentUser]];
        madeTitleActivity.ACL = madeTitleACL;

        [madeTitleActivity saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {

            NSLog(@"madeTitleActivity saveInBackgroundWithBlock -- called");

            if (succeeded) {
               // ..
            }
            else {
                NSLog(@"madeTitleActivity saveInBackgroundWithBlock -- error = %@", error);
            }
        }];
    }

    else {
        NSLog(@"etCommentIsTitle PFCloud  -- error = %@", error);
    }
}];

Answer 1

这个:

Error: object not found for update

表示您正在尝试保存一个与尚未保存的其他对象有关系的对象。你不能那样做，因为它不存在。

您需要找出它的另一个对象并确保首先保存它。

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请注意，您可以使用其中一种 saveAll... 方法批量保存多个新对象，既可以避免此类问题，又可以提高效率。