Hibernate嵌套物體列“id”不能為空

我正在嘗試保留一個鍛煉物件，該物件包含一個練習串列，其中包含一個練習集串列。我得到的錯誤是當我使用 CascadeType.ALL 時，hibernate 嘗試將鍛煉集持久化到資料庫。當我使用 MERGE 時，我沒有收到錯誤訊息，但未將練習集保存到資料庫中。但是鍛煉和鍛煉物件是。

我在這里錯過了什么？我唯一能想到的是我必須將運動物件放在運動集物件中，這最終會導致將它們相互添加的回圈。

物件如下：

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Workout {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    Long workoutId;

    @Column
    int day;

    @Column
    String workoutName;

    @OneToMany(cascade = CascadeType.ALL,
            orphanRemoval = true)
    @JoinColumn
    List<Exercise> exercises;

    @Column
    String createDate;
}

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class Exercise {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private Long exerciseId;

    @ManyToOne(fetch = FetchType.LAZY)
    private Workout workout;

    @OneToMany(mappedBy = "exercise",
            cascade = CascadeType.ALL)
    private List<ExerciseSet> exerciseSets;

    @OneToOne(cascade = CascadeType.MERGE)
    @JoinTable(name = "var_exercise",
            joinColumns =
                    { @JoinColumn(name = "exercise_id")},
            inverseJoinColumns =
                    { @JoinColumn(name = "variation_id" )})
    private ExerciseVariations exerciseVariations;
}

@Entity
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class ExerciseSet {

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    private Long setId;

    @Column
    private int setPosition;

    @Column
    private int reps;

    @Column
    private int weight;

    @ManyToOne
    @JoinColumn(name="exerciseId", nullable = false)
    private Exercise exercise;
}

我從前端獲取 WorkoutDto 并將其映射到具有映射器的物體，如下所示

    @PostMapping("/save")
    public void saveWorkout(@RequestBody WorkoutDto workoutDto) {
        workoutService.saveWorkout(workoutMapper.toWorkout(workoutDto));
    }

public Workout toWorkout(WorkoutDto workoutDto) {
        Workout workout = modelMapper.map(workoutDto, Workout.class);

        if (workoutDto.getWorkoutId() != null) {
            workout.setWorkoutId(workout.getWorkoutId());
        }
        workout.setWorkoutName(workoutDto.getWorkoutName());
        workout.setDay(workoutDto.getDay());
        List<Exercise> exerciseList = new ArrayList<>();
        for (ExerciseDto exerciseDto: workoutDto.getExercisesDto()) {
            List<ExerciseSet> exerciseSets = new ArrayList<>();
            for (ExerciseSetDto exerciseSetDto : exerciseDto.getExerciseSetDtoList()) {
                ExerciseSet exerciseSet = new ExerciseSet();
                exerciseSet.setSetPosition(exerciseSetDto.getSetPosition());
                exerciseSet.setReps(exerciseSetDto.getReps());
                exerciseSet.setWeight(exerciseSetDto.getWeight());
                exerciseSets.add(exerciseSet);
            }
            Exercise exercise = exerciseMapper.toExercise(exerciseDto);
            exercise.setExerciseSets(exerciseSets);
            exerciseList.add(exercise);
        }

        workout.setExercises(exerciseList);
        workout.setCreateDate(workoutDto.getCreateDate());

        return workout;
    }

uj5u.com熱心網友回復：

您沒有在Exercise中設定ExerciseSet，這是管理關系的一方。

您的代碼應如下所示：

public Workout toWorkout(WorkoutDto workoutDto) {
    Workout workout = modelMapper.map(workoutDto, Workout.class);

    if (workoutDto.getWorkoutId() != null) {
        workout.setWorkoutId(workout.getWorkoutId());
    }
    workout.setWorkoutName(workoutDto.getWorkoutName());
    workout.setDay(workoutDto.getDay());
    List<Exercise> exerciseList = new ArrayList<>();
    for (ExerciseDto exerciseDto: workoutDto.getExercisesDto()) {
       Exercise exercise = exerciseMapper.toExercise(exerciseDto);

        List<ExerciseSet> exerciseSets = new ArrayList<>();

        for (ExerciseSetDto exerciseSetDto : exerciseDto.getExerciseSetDtoList()) {
            ExerciseSet exerciseSet = new ExerciseSet();
            exerciseSet.setSetPosition(exerciseSetDto.getSetPosition());
            exerciseSet.setReps(exerciseSetDto.getReps());
            exerciseSet.setWeight(exerciseSetDto.getWeight());
            exerciseSet.setExercise(excercise);
            exerciseSets.add(exerciseSet);
        }
        exercise.setExerciseSets(exerciseSets);
        exerciseList.add(exercise);
    }

    workout.setExercises(exerciseList);
    workout.setCreateDate(workoutDto.getCreateDate());

    return workout;
}

然后你可以設定CascadeType為ALL.

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