jpa oneToMany 列表未更新

Question

我有两个 Webtoon 课程：

@Entity
@Data
@NoArgsConstructor
public class Webtoon {

    @Id //The unique id of the webtoon. 
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy="webtoon", orphanRemoval = true)
    @CollectionTable(name= "list_of_episodes")
    List<Episode> listOfEpisodes = new ArrayList<>();

    @Column(name= "price", unique = false, nullable = false)
    private BigDecimal price;

    private String repositoryGeneratedId;


    /**
     * Add episode in the list
     * @param episode
     */
    public void addEpisode(Episode episode) {
        listOfEpisodes.add(episode);
        episode.setWebtoon(this);
    }

    /**
     * Remove episode in the list
     * @param episode
     */
    public void removeEpisode(Episode episode) {
        listOfEpisodes.remove(episode);
        episode.setWebtoon(null);
    }

    /**
     * Root url where all files are hosted in nexus
     * @return
     */
    @JsonIgnore
    public String getRootUrl() {
        return this.companyId+"/webtoon/webtoon-"+this.repositoryGeneratedId;
    }


}

和剧集

@Entity
@Data
@NoArgsConstructor
public class Episode {

    @Id //The unique id.
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(name= "title", unique = false, nullable = false)
    private String title;

    @Column(name= "description", unique = false, nullable = false)
    private String description;

    @Column(name= "price", unique = false, nullable = false)
    private BigDecimal price;

    @OneToOne(cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
    private Image icon;

    @OneToOne(cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
    private Image episodeNexus;

    private String repositoryGeneratedId;

    @JsonIgnore
    @ManyToOne(cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
    @JoinColumn(name="webtoon_id")
    Webtoon webtoon;




}

这是我的测试：

1. 我创建了一个网络漫画
2. 我创建了一集
3. 使用 addEpisode 在 episodeList 中添加剧集
4. 创建对象 episodeNexus 并保存所有内容。

在我的 episodeList 中，我创建了该剧集，但 episodeNexus 为 Null。 为什么列表没有自动更新？

当我再次按 ID 获取 webtoon 时，我有正确的列表，其中包含在剧集中创建的项目。

如何在更新剧集后更新我的网络漫画？

Answer 1

在类双向映射中使用单向映射有时会出现问题。 @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER) @JoinColumn(name = "foreign-key-name")List<Episode> listOfEpisodes = new ArrayList<>(); 并从 Episode 表中删除 @ManyToOne 注释