MongoRepository Save() issue

Working with Data Java Frameworks
16

I encountered the same issue TODAY.
My element class is :

@Data
@Document(collection = "comment")
public class Comment {
    @Id
    private String id;
    private Integer bookId;
    private String username;
    private String content;
    private Date time;
    private List<Comment> replies;
    private String replyTo;

    public Comment() {
        // not used
    }
    public Comment(Integer bookId, String username, String content, String reply_to) {
        this.bookId = bookId;
        this.username = username;
        this.content = content;
        this.time = new Date();
        this.replies = new ArrayList<>();
        this.replyTo = reply_to;
    }
}

Initially, I tried to updating a comment’s reply list using MongoRepository.save method. It, however , doesn’t update anything.
Then, I referenced this post and manually write a updateComment method to update:

@Repository
public interface BookCommentRepository extends MongoRepository<Comment, String> {
    List<Comment> findByBookId(Integer bookId);

    @Query("{ 'id': ?0 }")
    @Update("{ '$set': {'replies': ?1 }}")
    void updateComments(String id, List<Comment> comments);
}

It does works. :slight_smile: