Java ObjectBox-对嵌套关系的查询

我有以下

实体

类

@io.objectbox.annotation.Entity
public class MultiplayerGameEntity extends BaseEntity {

    private int durationInHours;
    private ToMany<MultiplayerPlayerEntity> players;

    public MultiplayerGameEntity() {
    }

    public int getDurationInHours() {
        return durationInHours;
    }

    public void setDurationInHours(int durationInHours) {
        this.durationInHours = durationInHours;
    }

    public ToMany<MultiplayerPlayerEntity> getPlayers() {
        return players;
    }

    public void setPlayers(ToMany<MultiplayerPlayerEntity> players) {
        this.players = players;
    }
}

但这不起作用

java.lang.IllegalArgumentException:关系不属于实体多层性（17）

---

甚至可以做我正在做的事情吗，或者我需要以某种方式破解它吗？

我想我已经把链接链接在一起了，这样第二个链接就是上一个链接的结果（实际上是一个diff QueryBuilder）

QueryBuilder QueryBuilder=box.query（）；
queryBuilder.link（multipleLayerGrayerEntity_u2;.players）.link（multipleLayerPlayerEntity_2;u2eEntity）.equal（userEntity_2;u2eId，uniqueId）；

是的，应该是这样！完成说明：原始代码不起作用，因为无法直接从

多层组织实体

实体信息访问

用户实体

关系。使用

QueryBuilder.link（relationInfo）

返回可以访问目标实体信息

relationInfo

指向的关系的

QueryBuilder

。

@io.objectbox.annotation.Entity
public class MultiplayerPlayerEntity extends BaseEntity {

    public ToOne<UserEntity> userEntity;
    public ToMany<MultiplayerRoundEntity> rounds;

    public MultiplayerPlayerEntity() {
    }
}

@io.objectbox.annotation.Entity
public class UserEntity extends BaseEntity {

    private String uniqueId;
    private String displayName;
    private ToMany<UserEntity> friends;

    public UserEntity() {
    }

    public UserEntity(String uniqueId, String displayName) {
        this.uniqueId = uniqueId;
        this.displayName = displayName;
    }

    public String getUniqueId() {
        return uniqueId;
    }

    public void setUniqueId(String uniqueId) {
        this.uniqueId = uniqueId;
    }

    public String getDisplayName() {
        return displayName;
    }

    public void setDisplayName(String displayName) {
        this.displayName = displayName;
    }

    public ToMany<UserEntity> getFriends() {
        return friends;
    }

    public void setFriends(ToMany<UserEntity> friends) {
        this.friends = friends;
    }
}

            queryBuilder.link(MultiplayerGameEntity_.players);
            queryBuilder.link(MultiplayerPlayerEntity_.userEntity).equal(UserEntity_.uniqueId, uniqueId);
            return queryBuilder.build().find();
        }

QueryBuilder<MultiplayerGameEntity> queryBuilder = box.query();
queryBuilder.link(MultiplayerGameEntity_.players).link(MultiplayerPlayerEntity_.userEntity).equal(UserEntity_.uniqueId, uniqueId);