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我有一个包含链接对象的领域对象。

@RealmClass
public class VolleyballPlayer extends RealmObject {

    @PrimaryKey
    private String id;

    @LinkingObjects("volleyballPlayer")
    private final RealmResults<Player> players = null;
}

@RealmClass
public class Player extends RealmObject {

    private Set set;
    private VolleyballPlayer volleyballPlayer;
    private BasketballPlayer basketballPlayer;
    private String playerName = "";
}

我想对 realmObject 中的链接对象进行排序。但是第一个查询正在运行，但其他查询由于排序的链接对象而崩溃。

     RealmResults<VolleyballPlayer> volleyballPlayers = 
   mRealm.where(VolleyballPlayer.class)
.findAll();

     RealmResults<VolleyballPlayer> volleyballPlayers = 
  mRealm.where(VolleyballPlayer.class)
.sort("link.playerName") 
.findAll();

我的崩溃报告：

  java.lang.IllegalArgumentException: 
Invalid query: field 'volleyballPlayer' in class 'VolleyballPlayer' is of invalid type 'LINKING_OBJECTS'.
                                                                              at io.realm.internal.fields.FieldDescriptor.verifyColumnType(FieldDescriptor.java:277)
                                                                              at io.realm.internal.fields.FieldDescriptor.verifyInternalColumnType(FieldDescriptor.java:230)
                                                                              at io.realm.internal.fields.CachedFieldDescriptor.compileFieldDescription(CachedFieldDescriptor.java:83)
                                                                              at io.realm.internal.fields.FieldDescriptor.compileIfNecessary(FieldDescriptor.java:285)
                                                                              at io.realm.internal.fields.FieldDescriptor.getFinalColumnType(FieldDescriptor.java:213)
                                                                              at io.realm.internal.SortDescriptor.checkFieldType(SortDescriptor.java:110)
                                                                              at io.realm.internal.SortDescriptor.getInstance(SortDescriptor.java:95)
                                                                              at io.realm.internal.SortDescriptor.getInstanceForSort(SortDescriptor.java:65)
                                                                              at io.realm.RealmQuery.sort(RealmQuery.java:1953)
                                                                              at io.realm.RealmQuery.sort(RealmQuery.java:1914)
                                                                              at io.realm.RealmQuery.sort(RealmQuery.java:1898)
                                                                              at com.android.android.dao.crud.ShareCRUD$1.run(ShareCRUD.java:40)
                                                                              at com.android.android.dao.RealmController$1.run(RealmController.java:60)
                                                                              at java.lang.Thread.run(Thread.java:762)
4

1 回答 1

2

Realm 不支持对链接对象进行排序。所以我将name字段添加到VolleyballPlayer.

@RealmClass
public class VolleyballPlayer extends RealmObject {

    @PrimaryKey
    private String id;
    private String name = "";

    @LinkingObjects("volleyballPlayer")
    private final RealmResults<Player> players = null;
}

排序是：

RealmResults<VolleyballPlayer> volleyballPlayers = 
  mRealm.where(VolleyballPlayer.class)
  .sort("name") 
  .findAll();

谢谢

于 2018-01-15T12:35:20.213 回答