针对特定集合的多对多关系核心数据查询

public enum Ability: String {
  case newcomer = "Newcomer"
  case beginner = "Beginner"
  case intermediate = "Intermediate"
  case advanced = "Advanced"
}

public enum Group: String {
  case solo = "Solo"
  case duo = "Duo"
  case team = "Team"
}

我想找到与以下内容匹配的所有表演。

ability == "Beginner"
group == "Duo"
performers == "Jane Davies" && "Alice Evans"

文档 https://stackoverflow.com/a/17097033/1951992表明不支持核心数据中的聚合操作，这令人惊讶。诸如此类的问题已经被之前问过 https://stackoverflow.com/a/2328651/1951992在这里并建议使用“任何”。

据我了解，“Any”会返回包含“Jane”或“Alice”或“Jane & Alice”的表演，对吗？我只想要包括“简和爱丽丝”在内的表演。

我该如何为此查询编写谓词？

Thanks

带有（不同的）列表演员对象，以下谓词should工作 找到所有表现与那些完全相关的对象 表演者：

let perf1 = ... // Performer object for "Jane Davies"
let perf2 = ... // Performer object for "Alice Evans"
let list = [perf1, perf2]

let predicate = NSPredicate(format: "performers.@count = %ld AND ALL performers in %@", list.count, list)

但显然并非如此。解决方法是使用 SUBQUERY：

let predicate = NSPredicate(format: "performers.@count = %ld AND SUBQUERY(performers, $p, $p in %@).@count = %ld",
      list.count, list, list.count)