删除领域中的多个子对象时如何按祖父值过滤？

Question

我正在尝试删除与特定锻炼对象中的所有锻炼对象关联的所有 WSR 对象。

我只是在过滤掉所有 WSR 对象时遇到了一些问题。现在的设置方式是，如果我有多个 Exercise 对象，只有与第一个 Exercise 对象相关联的 WSR 值会被删除，而不会删除其余的。

如何过滤掉与特定锻炼中的所有锻炼对象关联的所有 WSR 对象？

class Days : Object {
    @objc dynamic var weekday : String = ""

    let workout = List<Workouts>()
}

class Workouts : Object {
    @objc dynamic var title : String = ""
    var parentDay = LinkingObjects(fromType: Days.self, property: "workout")

    let exercise = List<Exercises>()
}

class Exercises : Object {
    @objc dynamic var exerciseName : String = ""

    var parentWorkout = LinkingObjects(fromType: Workouts.self, property: "exercise")

    let wsr = List<WeightSetsReps>()
}

class WeightSetsReps : Object {
    @objc dynamic var weight = 0
    @objc dynamic var reps = 0
    var parentExercise = LinkingObjects(fromType: Exercises.self, property: "wsr")
}

if days?[indexPath.section].workout[indexPath.row].exercise.isEmpty == false {

    if let selectedWorkout = days?[indexPath.section].workout[indexPath.row] {
        let thisWorkoutsExercises = realm.objects(Exercises.self).filter("ANY parentWorkout == %@", selectedWorkout)
        // Filter function to get all wsr's associated with the selected workout...
        let thisWorkoutsWsr = realm.objects(WeightSetsReps.self).filter("ANY parentExercise == %@", days?[indexPath.section].workout[indexPath.row].exercise[indexPath.row])

        realm.delete(thisWorkoutsWsr)
        realm.delete(thisWorkoutsExercises)
        realm.delete((days?[indexPath.section].workout[indexPath.row])!)
    }
} else {
    realm.delete((days?[indexPath.section].workout[indexPath.row])!)
}

Answer 1

问题出在这一行：
let thisWorkoutsWsr = realm.objects(WeightSetsReps.self).filter("ANY parentExercise == %@", days?[indexPath.section].workout[indexPath.row].exercise[indexPath.row])

通过使用 ANY parentExercise == ... .exercise[indexPath.row])，您仅从一个索引的练习中请求 WSR。恕我直言，如果此锻炼的锻炼次数低于锻炼天数，这甚至可能会崩溃。
通过使用 ANY .. IN .. 运算符，您可以请求 exercise 数组中的所有练习。

试试这个：

    guard let workout = days?[indexPath.section].workout[indexPath.row] else { return }
    if workout.exercise.isEmpty {  
        realm.delete(workout)
        return
    }


    let thisWorkoutsExercises = realm.objects(Exercises.self).filter("ANY parentWorkout == %@", workout)
    // Filter function to get all wsr's associated with the selected workout...
    let thisWorkoutsWsr = realm.objects(WeightSetsReps.self).filter("ANY parentExercise IN %@", thisWorkoutsExercises)

    realm.delete(thisWorkoutsWsr)
    realm.delete(thisWorkoutsExercises)
    realm.delete(workout)

删除领域中的多个子对象时如何按祖父值过滤？

How to filter by grand parent value when deleting multiple child objects in realm?

filter

realm

swift