本文介绍了Swift核心数据谓词IN子句的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图将IN子句与NSPredicate一起使用.我收到以下错误:
I'm attempting to use an IN clause with an NSPredicate. I'm getting the following error:
代码如下:
let fetchRequest: NSFetchRequest<Employee> = NSFetchRequest(entityName: "Employee")
fetchRequest.sortDescriptors = [
NSSortDescriptor.init(key: "lastName", ascending: true)
]
fetchRequest.predicate = NSPredicate(format: "ANY id IN %@", argumentArray: recentEmployeeIds)
fetchedResultsController = NSFetchedResultsController.init(fetchRequest: fetchRequest,
managedObjectContext: FLCoreDataController.shared.mainObjectContext,
sectionNameKeyPath: nil,
cacheName: nil)
fetchedResultsController?.delegate = self
try? fetchedResultsController?.performFetch()
关于什么是问题的任何想法?
Any ideas as to what the problem is?
推荐答案
您没有展示如何定义recentEmployeeIds
,而是假设其类似
You don't show how you are defining recentEmployeeIds
, but assuming its something like
let recentEmployeeIds:[Int] = ...
然后您需要正确地初始化NSPredicate
. argumentArray
then you need to init the NSPredicate
correctly. There is no label for argumentArray
fetchRequest.predicate = NSPredicate(format: "ANY id IN %@", recentEmployeeIds)
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