NSPredicate 获取children的children

NSPredicate to get children#39;s children#39;s(NSPredicate 获取children的children)

问题描述

我想获取所有的治疗，它们是这个 List 对象的子对象.

I want to fetch all the treatments, that are children of this List object.

我不确定是否可以做到.

I am not sure if it can be done.

我有一个 TableView 显示列表中的所有患者.每个患者可以接受多种治疗.

I have a TableView showing all the patients of a list. Each patient can have many treatments.

我有一个对当前列表的引用，并想用它来以某种方式找到孩子们的孩子.

I have a reference to the current list, and want to use that to somehow find the childrens children.

谢谢

推荐答案

对带有谓词的Treatment"实体使用获取请求

Use a fetch request for the "Treatment" entity with the predicate

[NSPredicate predicateWithFormat:@"ofPatient.ofList = %@", currentList]

使用治疗"->患者"->列表"中的反向关系.

using the inverse relationships from "Treatment" -> "Patient" -> "List".

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