Android领域迁移问题。字段类型更改

Question

我的数据库类文件中有某个字段。我需要将他们的类型从String更改为int。我在github中按照示例进行操作。以下是我结束它的场景

public class LeaderBoardDb extends RealmObject {
//    private String percentile;
//
//    private String rank;

    private String details;

    private String email;

    @PrimaryKey
    private String userId;

    private String name;

//    private String rewards;
//
//    private String sweatPointEarned;

    private String photoUrl;

    private String note;

    private String displayName;

    private float userPercentile;

    private int userRank;

    private int userRewards;

    private int userSweatPointsEarned;
}

迁移代码

if(oldVersion == 6){


                schema.get("LeaderBoardDb")
                        .addField("userPercentile", float.class)
                .addField("userRank",int.class)
                .addField("userRewards",int.class)
                .addField("userSweatPointsEarned", int.class)
                .removeField("percentile")
                .removeField("rank")
                .removeField("rewards")
                .removeField("sweatPointEarned")
                        .renameField("userPercentile", "percentile")
                        .renameField("userRank", "rank")
                        .renameField("userRewards","rewards")
                        .renameField("userSweatPointsEarned", "sweatPointEarned");

                oldVersion++;
            }

Stack Stack我得到的内容如下：

03-31 13:52:03.901 9535-9535/com.workoutguru.workoutcash E/AndroidRuntime: Process: com.workoutguru.workoutcash, PID: 9535
03-31 13:52:03.901 9535-9535/com.workoutguru.workoutcash E/AndroidRuntime: io.realm.exceptions.RealmMigrationNeededException: Primary key not defined for field 'userId' in existing Realm file. Add @PrimaryKey.
03-31 13:52:03.901 9535-9535/com.workoutguru.workoutcash E/AndroidRuntime:     at io.realm.LeaderBoardDbRealmProxy.validateTable(LeaderBoardDbRealmProxy.java:337)
03-31 13:52:03.901 9535-9535/com.workoutguru.workoutcash E/AndroidRuntime:     at io.realm.DefaultRealmModuleMediator.validateTable(DefaultRealmModuleMediator.java:121)