EntityManager中的实体更新 [英] Entity update in EntityManager

问题描述

简要描述整个情况。我有一个实体

Describe briefly the whole situation. I have an entity

public class MovieEntity {
... 
    @OneToMany(mappedBy = "movie", cascade = CascadeType.ALL)
    private Set<MovieOtherTitle> otherTitles;
...
}

我使用JPA Spring数据存储库

I save a movie in the database using the JPA Spring Data repository

this.movieRepository.save(movie);

然后我在影片中添加另一个标题

Then I add another title to the film

final MovieOtherTitle movieOtherTitle = new MovieOtherTitle(otherTitle.getTitle(), otherTitle.getCountry());
movieOtherTitle.setMovie(movie);
movieOtherTitle.setUser(user);
this.entityManager.persist(element);

当我想显示这部电影的标题列表时，该列表为空白

And when I want to display a list of titles for this movie, the list is BLANK

movie.getOtherTitles()

重新编译应用程序后，一切正常。为什么？似乎该实体没有实时刷新列表。我必须再次编译该应用程序，然后才能看到列表中的元素。

After recompile the application, everything is OK. WHY? It looks as if this entity did not refresh the list in real time. I have to compile the application again and only then you can see the elements in the list.

推荐答案

this.movieRepository.save(movie);
final MovieOtherTitle movieOtherTitle = new MovieOtherTitle(otherTitle.getTitle(), otherTitle.getCountry());
movieOtherTitle.setMovie(movie);
movieOtherTitle.setUser(user);

movie.getOtherTitles().add(movieOtherTitles);

this.movieReoository.save(movie);

因此，在调用
movie.getOtherTitles（）之后，
列表不会为空

So after calling movie.getOtherTitles(); the list will not be empty

您可以获取另一个标题的ID

you can get the id of the otherTitle

movie.getOtherTitles().get(0).getId 

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