领域迁移未正确实施

Question

我正在Android应用中使用Realm，我想执行以下操作：

• 将现有字段设为主键。
• 将字段类型从int更改为String

我为上述更改编写了以下迁移：

public class MyMigration implements RealmMigration {
    @Override
    public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
        RealmSchema schema = realm.getSchema();
            RealmObjectSchema objectSchema = schema.get("AccessInfo");
            objectSchema.addIndex("bookId");
            objectSchema.addPrimaryKey("bookId");
            objectSchema.removeField("lastOpenedTimeStamp");
            objectSchema.addField("lastOpenedTimeStamp", String.class);
        oldVersion++;
    }
}

但是我仍然在MainActivity中遇到以下错误：

 Caused by: io.realm.exceptions.RealmMigrationNeededException: Migration is required due to the following errors:
- Property 'AccessInfo.bookId' has been made indexed.
- Property 'AccessInfo.lastOpenedTimeStamp' has been changed from 'int' to 'string'.
- Primary Key for class 'AccessInfo' has been added.

以下是我的领域配置

defaultConfig = new RealmConfiguration.Builder().modules(new DefaultModule()).migration(new MyMigration()).build();
realm = Realm.getInstance(defaultConfig);

AccessInfo：

public class AccessInfo extends RealmObject {

    @PrimaryKey
    int bookId;
    String lastOpenedTimeStamp;
    int lastOpenedPageId;
    int lastOpenedPageNumber;
    int lastOpenedPartNumber;
    int accessCount;

    public int getBookId() {
        return bookId;
    }

    public void setBookId(int bookId) {
        this.bookId = bookId;
    }

    public String getLastOpenedTimeStamp() {
        return lastOpenedTimeStamp;
    }

    public void setLastOpenedTimeStamp(String lastOpenedTimeStamp) {
        this.lastOpenedTimeStamp = lastOpenedTimeStamp;
    }

    public int getLastOpenedPageId() {
        return lastOpenedPageId;
    }

    public void setLastOpenedPageId(int lastOpenedPageId) {
        this.lastOpenedPageId = lastOpenedPageId;
    }

    public int getLastOpenedPageNumber() {
        return lastOpenedPageNumber;
    }

    public void setLastOpenedPageNumber(int lastOpenedPageNumber) {
        this.lastOpenedPageNumber = lastOpenedPageNumber;
    }

    public int getLastOpenedPartNumber() {
        return lastOpenedPartNumber;
    }

    public void setLastOpenedPartNumber(int lastOpenedPartNumber) {
        this.lastOpenedPartNumber = lastOpenedPartNumber;
    }

    public int getAccessCount() {
        return accessCount;
    }

    public void setAccessCount(int accessCount) {
        this.accessCount = accessCount;
    }
}

感谢任何支持。 谢谢。