Ebean无法获取oneToMany关系

Question

我有一个具有testattribut类型属性的Post实体，其代码如下：

    @Entity
    public class Post extends Model {
    @Id
    private long id;
    @ManyToOne
    private PostType postType;
    @ManyToOne
    private User user;
    @ManyToOne
    private Category category;

    @OneToMany (cascade = CascadeType.PERSIST)
    private List<ImageLink> testattribut;
    private String description;
    private int likes;
    private int messages;
    private boolean liked;
    private boolean saved;
    private Date timesTamp;

    //getters and setters

    }

我尝试通过传递RawSql后获得属性testattribut（在其中我也获得其他属性），如下面的代码所示>>

    public Result test(){

        long user_id = 1;

        String sql =
                "SELECT p.id, p.description, p.likes, p.times_tamp, u.id, " +
                "u.name, u.phone, u.profile_url, u.rate, u.rate_count, c.id, " +
                "EXISTS ( " +
                "SELECT * " +
                "FROM likes " +
                "WHERE p.id = likes.post_id " +
                "AND likes.user_id = "+user_id +
                ") AS liked "+
                "FROM post p " +
                "JOIN user_ u ON u.id = p.user_id "+
                "JOIN category c ON c.id = p.category_id";

        RawSql rawSql = RawSqlBuilder
                .parse(sql)
                .tableAliasMapping("u", "user")
                .columnMapping("c.id", "category.id")
                .create();


        List<TestEntity> data = TestEntity.finder
                .query()
                .setRawSql(rawSql)
                .fetch("testattribut.image", "url")
                .findList();


        return ok(Ebean.json().toJson(data));
    }
我的问题是，当我使用Ebean.json（）。tojson（）返回查询结果时，未返回testattribut属性。这是返回的结果：

{
    "id": 1,
    "user": {
        "id": 18,
        "name": "smozi_shop",
        "phone": "[phone]",
        "profileUrl": null,
        "rate": 0.0,
        "rateCount": 0
    },
    "category": {
        "id": 1
    },
    "description": "smozi",
    "likes": 1,
    "liked": false,
    "timesTamp": 1575956493968
}
注意，当我使用json.toJson（）返回结果时，将无法返回所返回实体的属性我可以使用json.toJson（），但我只想恢复实体的部分属性，包括testattribut，此外，使用json.toJson（）会使网络上的数据加载变得繁重]

谢谢

我有一个Post实体，该实体具有以下代码的testattribut type属性：@Entity公共类Post扩展了模型{@Id private long id; @ManyToOne私人PostType ...

Answer 1

您还将需要在ImageLink上加入JOIN才能将其包括在结果集中。