关系返回mappedBy引用未知的目标实体属性

Question

我对Meal和MealGroup之间的关系有问题。Hibernate返回给我："mappdBy引用未知的目标实体属性"。我有两个实体：

我尝试删除@Join Column和mappedBy。已创建其他表，但我想加入该列。

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class Meal {

    @Id
    @NotNull
    private int Id;

    private String name;

    @OneToMany(mappedBy = "meal")
    private List<Product> products;

    @ManyToOne
    @JoinColumn(name = "meal_group_id")
    private MealGroup mealGroup;
}

和

@Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
public class MealGroup {

    @Id
    @NotNull
    private int Id;

    private String groupName;

    private LocalDateTime time;

    @OneToMany(mappedBy = "meal_group")
    private List<Meal> meals;
}

谢谢你的帮助。

Answer 1

您需要在mappedBy中使用类成员名称。

//MealGroup class
...
@OneToMany(mappedBy = "mealGroup")
private List<Meal> meals;