我的嵌套SUBQUERY谓词有什么问题？ [英] What is wrong in my nested SUBQUERY predicate?

问题描述

我有你可以看到下面的数据模型，和一个嵌套的SUBQUERY谓词，但在某种程度上它只是不工作。任何想法如何纠正它？

I have the data model you can see below, and a nested SUBQUERY predicate, but in somehow it just not works. Any idea how to correct it?

我想，这里下来是最后工作：

I figured out, this here down is working finally:

[NSPredicate predicateWithFormat:@"SUBQUERY(bs, $B, SUBQUERY($B.cs, $C, $C.ds.name != \"xxx\").@count > 0).@count > 0"];

推荐答案

好的，这里是工作的解决方案：

Ok, so here is the working solution:

[NSPredicate predicateWithFormat:@"SUBQUERY(bs, $B, SUBQUERY($B.cs, $C, $C.ds.name != \"xxx\").@count > 0).@count > 0"];

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