@Entity
@Getter
@Setter
@Table(name = "children")
public class Child extends BaseEntity {

    @Column(name = "firstName")
    private String firstName;

    @Column(name = "lastName")
    private String lastName;

    @OneToOne
    @JoinColumn(name = "group_id", referencedColumnName = "id")
    private Group group;

    @Column(name = "medical_info")
    private String medicalInfo;

    @Column(name = "birth_date")
    @Temporal(TemporalType.DATE)
    private Date birthDate;

    @Column(name = "starting_date")
    @Temporal(TemporalType.DATE)
    private Date startingDate;

    @Column(name = "native_language")
    private String nativeLanguage;

    @Column(name = "second_language")
    private String secondLanguage;

    private String picture;
}

我试图删除一个组，但这失败了，因为有些孩子有fk到该组。该组没有任何fk到子级。我可以找到所有的孩子与fk到该组，并设置该组为空，然后保存，但这看起来黑客和肯定有一个更好的选择。我怎样才能很好地移除fk？