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我无法在 Parse 中保存 PFRelation。我有一条消息 PFObject 并希望将其添加到 PFUser 类中的 PFRelation receivedMessages 中。代码如下。一切都在努力建立这种关系。我已经很好地设置了用户对象，NSLog 显示了正确的用户，但似乎[sendtoUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error)根本没有被调用，因为控制台中没有显示“保存的关系”。有人可以帮忙吗？谢谢

PFObject *message = [PFObject objectWithClassName:@“message”];
message[@“fromUser"]=[PFUser currentUser].username;
message[@“message"]=@"喵!";
message[@“read"]=@NO;

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

    NSLog(@“message saved”);
    PFQuery *usernameQuery = [PFUser query];
    [usernameQuery whereKey:@"username" equalTo:[[self.friends objectAtIndex:index] username]];
    [usernameQuery findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        PFUser *sendtoUser = (PFUser *)objects[0];
        NSLog(@"send to user: %@", sendtoUser.username); //this works

        PFRelation *receivedMessages = [sendtoUser relationForKey:@"receivedMessages”];
        [receivedMessages addObject:message];

        [sendtoUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
            NSLog(@“relation saved”); //this doesn’t display at all                
        }];//end save user relation block

    }];//end username query block


}];//end save message block, this works
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