Ios 从一对多关系核心数据检索数据

我需要检索多对多关系中每个属性的值。我加载它的代码是

func loadData() {
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

    let managedContext = appDelegate.managedObjectContext

    let fetchRequest = NSFetchRequest(entityName: "Company")

    do {
        //Get the results
        let results = try managedContext.executeFetchRequest(fetchRequest)
        //Load the results in the people array
        people = results as! [NSManagedObject]
        for i in 0..<people.count {
            let data = people[i]
            let variableToPrint = data.valueForKey("employee")
            print(variableToPrint)
        }
    } catch let error as NSError {
        print("Could not fetch \(error), \(error.userInfo)")
    }
}

func loadData（）{
让appDelegate=UIApplication.sharedApplication（）。委托为！appDelegate
让managedContext=appDelegate.managedObjectContext
let fetchRequest=NSFetchRequest（entityName:“公司”）
做{
//得到结果
让结果=尝试managedContext.executeFetchRequest（fetchRequest）
//将结果加载到人员数组中
人员=结果为！[NSManagedObject]
对于0中的i..您可以简单地使用company.employees，这是由核心数据本身创建的NSSet，无需对公司和员工执行提取请求。您面临的问题是什么？是否返回了任何记录？而且您收到的消息不是错误。请检查此链接。不清楚您的实际问题是什么…不要担心关注“关系‘雇员’错误”-这是完全正常的-请参阅。@someonecalledphilippe要获得一个集合，其中包含
employee
关系的“name”属性的所有值（例如），只需使用
let variableToPrint=data.valueForKeyPath（“employee.name”）
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate

let managedContext = appDelegate.managedObjectContext

let companyEntity = NSEntityDescription.entityForName("Company", inManagedObjectContext: managedContext)
let company = NSManagedObject(entity: companyEntity!, insertIntoManagedObjectContext: managedContext)
    company.setValue("Apple", forKey: "name")

//Add employees
let employeeEntity = NSEntityDescription.entityForName("Employees", inManagedObjectContext: managedContext)

let person = NSManagedObject(entity: employeeEntity!, insertIntoManagedObjectContext: managedContext)
for i in 0..<employeeNameArray.count {
        let name = employeeNameArray[i]
        let when = dateJoinedArray[i]
        let number = employeeNumberArray[i]

        person.setValue(name, forKey: "employeeName")
        person.setValue(number, forKey: "employeeNumber")
        person.setValue(when, forKey: "dateHired")
        company.setValue(NSSet(object: person), forKey: "employee")
}

//Employee info to company        
company.setValue(NSSet(object: person), forKey: "employee")

do {
    try managedContext.save()
    //people.append(person)
} catch let error as NSError {
    print("Could not save \(error), \(error.userInfo)")
}