核心数据NSPredicate使用in子句获取实体关系

Question

我希望能够使用IN子句搜索实体的关系.我有以下设置:

我想发送一系列昵称,找到与这些昵称相关的所有人.

//array of names to find
let nameArray: [String] = ["Tom", "Tommy", "Thomas"] 

// find all Persons who have a nickname associated with that person           
let predicate = NSPredicate(format: "ANY Person.nickName in %@",nameArray)
var fetch = NSFetchRequest(entityName: "Person")
fetch.predicate = predicate
var fetchError : NSError? = nil

// executes fetch
let results = context?.executeFetchRequest(fetch, error: &fetchError)

但是当我运行代码时,我收到以下错误:

'NSInvalidArgumentException',原因:'谓词的未实现的SQL生成:(任何Person.nickName IN {"Tom","Tommy","Thomas"})'

我在这做错了什么？如果我删除谓词搜索,它会返回所有结果,但是一旦我添加了这一行,一切都会中断.

Answer 1

您应该使用您的关系名称NSPredicate.
试试这个:

let predicate = NSPredicate(format: "ANY personToNick.nickName in %@", nameArray)