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为什么我不能打印出objectId这个数据, 我打印出来的是NULL #1

@JJJJJJJerk

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@JJJJJJJerk
BmobObject *obj = [self.posts objectAtIndex:indexPath.row];
ForumPost *fPost = [[ForumPost alloc]init];
fPost.objectId = (NSString *)[obj objectForKey:@"objectId"];
NSLog(@"objectId%@",(NSString *)[obj objectForKey:@"objectId"]);
fPost.title = [obj objectForKey:@"title"];
fPost.content = [obj objectForKey:@"content"];
return fPost;

}
title和content这两列的数据能够显示出来!就是objectId显示不出来,这个是不是很免费用户的功能锁定有关啊?我是初学者,

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