我怎样才能获得相关对象NSSet或者我/我应该使用NSPredicate？

Question

我的下面代码是否可以显示所有练习，而不仅仅是当天附加的练习。现在，如果我使用day.dayExercises并使用for循环，我可以访问tableview所需的所有必要数据，但是我不确定如何更改fetchrequest以在day.dayexercises关系中使用对象。

class ExercisesTableViewController: UITableViewController, NSFetchedResultsControllerDelegate {

var dayExercises:[Exercises] = []
var day:Days!
var fetchResultController:NSFetchedResultsController!

override func viewDidLoad() {
    super.viewDidLoad()

    self.title = "\(day.day)"

    // print(day.dayExercises)

    for item in day.dayExercises{
        print(item)
    }

    let fetchRequest = NSFetchRequest(entityName: "Exercises")
    let sortDescriptor = NSSortDescriptor(key: "name", ascending: true)

    fetchRequest.sortDescriptors = [sortDescriptor]

    if let managedObjectContext = (UIApplication.sharedApplication().delegate as? AppDelegate)?.managedObjectContext {

        fetchResultController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
        fetchResultController.delegate = self

        do {
            try fetchResultController.performFetch()
            dayExercises = fetchResultController.fetchedObjects as! [Exercises]
        } catch {
            print(error)
        }
    }

print（item）输出以下内容：

<Gym_Notes.Exercises: 0x12e66d4d0> (entity: Exercises; id: 0xd000000000080004 <x-coredata://XXXXX-D879-XXXX-9DE7-7AXX14XXX623/Exercises/p2> ; data: {
exerciseDay = "0xd000000000040002 <x-coredata://79XX0B7D-XX79-43XX-9DE7-7A26XXXX2623/Days/p1>";
image = <89504e47 0d0a1a0a 0000000d 49484452 00000080 00000080 08060000 00c33e61 cb000000 01735247 4200aece 1ce90000 0009>;
    name = Bob;
    reps = Bob;
    rest = Bob;
    sets = Bob;
    weight = Bob;
})