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JPA双向关系父级为空

entity jpa spring-boot

stefan.stt · 技术社区 · 5 年前

我父母之间有双向关系 AbstractNewsContent 以及它的孩子“新闻评论”。当我保存 摘要新闻内容 添加了 NewsComment 这个 newsComment.getAbstractNewsContent null

摘要新闻内容:

@Entity
@Table(name = "NEWS_CONTENT")
public abstract class AbstractNewsContent {

    @OneToMany(mappedBy = "newsContent", cascade = CascadeType.ALL, orphanRemoval = true)
    private Set<NewsComment> newsComments = new HashSet<>();

}

新闻评论:

@Entity
@Table(name = "NEWS_COMMENT")
public class NewsComment {

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "news_content_id", nullable = false)
    @OnDelete(action = OnDeleteAction.CASCADE)
    private AbstractNewsContent newsContent;

}

    DailyNewsContent dailyNewsContent = new TestDataBuilder()
            .createDailyNewsContent().setRequiredDefaults(categoryFood)
            .addComment().setRequiredDefaults().parent()
            .build();

    DailyNewsContent dbDailyContent = abstractNewsContentRepository.save(dailyNewsContent);

    // there is the added newsComment inside the newsContent
    Assertions.assertEquals(1, dbDailyContent.getNewsComments().size());
    // NewsComment reference to the NewsContent is null
    Assertions.assertNull(new ArrayList<>(dbDailyContent.getNewsComments()).get(0).getNewsContent());

    abstractNewsContentRepository.delete(dbDailyContent);
    // newsComment is deleted from the database, there is nothing in the Iterable
    newsCommentRepository.findAll();