Question

我有一个模型ModelA，它是两个RealmModules的一部分。在一个RealmModule中，我希望模型有一个主键，而另一个我不需要。所以我试图在Android应用程序启动时从模型中删除主键。并且

我是否曾提到在一个模块中，这个模型，ModelA充当父模型，而在其他模块中，它的角色是儿童模型的子，即ModelC - ＆gt; ModelB - ＆gt; ModelA

以下是代码段：

    public class ModelA extends RealmObject {

    @PrimaryKey
    private long id; 

    @Required
    private String name; 

    //public getters and setters 
}

而在其他RealmModule我有ModelB和ModelC，它们是这样的：

public class ModelB extends RealmObject{
    @PrimaryKey
    private long id;

    ModelA childModelA;

    //public getters and setters
}


public class ModelC extends RealmObject{
    @PrimaryKey
    private long id;

    ModelB childModelB;

    //public getters and setters
}

模块本身看起来像：

@RealmModule(classes = {
        ModelA.class
 } , library = true)
public class SmallModule{}




   @RealmModule(classes = {
            ModelA.class,
            ModelB.class,
            ModelC.class,
} , library = true)
    public class BigModule{}

当架构/模块为BigModule时，我正试图从ModelA中删除PrimaryKey

 final RealmObjectSchema objectSchema = realmSchema.get(ModelA.class.getSimpleName());

realm.executeTransaction(new Realm.Transaction() {
                        @Override
                        public void execute(Realm realm) {
                            objectSchema.removePrimaryKey();
objectSchema.addIndex("id");
                    });

到目前为止一直很好..当我尝试在SmallModule中复制/更新到域时，它的工作正常。但是一旦我尝试在BigModule上做同样的事情，这就是我得到的：

04-10 21:49:17.002 12946-13321/org.jay.test1.debug E/REALM_JNI: jni: ThrowingException 2, columnIndex is less than 0., .
        04-10 21:49:17.002 12946-13321/org.jay.test1.debug E/REALM_JNI: Exception has been throw: columnIndex is less than 0.
        04-10 21:49:17.017 12946-12946/org.jay.test1.debug V/InputMethodManager: onWindowFocus: android.support.v4.widget.DrawerLayout{943b8b0 VFED..... .F....ID 0,0-480,800 #7f110086 app:id/drawer_layout} softInputMode=19 first=false flags=#81810100
        04-10 21:49:17.017 12946-12946/org.jay.test1.debug V/InputMethodManager: START INPUT: android.support.v4.widget.DrawerLayout{943b8b0 VFED..... .F....ID 0,0-480,800 #7f110086 app:id/drawer_layout} ic=null tba=android.view.inputmethod.EditorInfo@c1bce40 controlFlags=#101
        04-10 21:49:17.043 12946-12946/org.jay.test1.debug E/DBHelper: [main::1] Error while inserting record
        04-10 21:49:17.045 12946-12946/org.jay.test1.debug E/DBHelper: [main::1] Subscriber Error::columnIndex is less than 0.
        java.lang.ArrayIndexOutOfBoundsException: columnIndex is less than 0.
        at io.realm.internal.Table.nativeFindFirstInt(Native Method)
        at io.realm.internal.Table.findFirstLong(Table.java:1077)
        at io.realm.ModelARealmProxy.copyOrUpdate(ModelARealmProxy.java:965)
        at io.realm.ModelBRealmProxy.copy(ModelBRealmProxy.java:810)
        at io.realm.ModelBRealmProxy.copyOrUpdate(ModelBRealmProxy.java:779)
        at io.realm.ModelCRealmProxy.copy(ModelCRealmProxy.java:1183)
        at io.realm.ModelCRealmProxy.copyOrUpdate(ModelCRealmProxy.java:1136)
        at io.realm.BigModuleMediator.copyOrUpdate(BigModuleMediator.java:370)
        at io.realm.Realm.copyOrUpdate(Realm.java:1505)
        at io.realm.Realm.copyToRealmOrUpdate(Realm.java:953)
        at org.jay.test1.DBHelper$1$1.execute(DBHelper.java:66)
        at io.realm.Realm$1.run(Realm.java:1402)
        at io.realm.internal.async.BgPriorityRunnable.run(BgPriorityRunnable.java:34)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
        at java.util.concurrent.FutureTask.run(FutureTask.java:237)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
        at java.lang.Thread.run(Thread.java:818)

领域是2.3.1

Answer 1

@Beender完全正确。当您更改架构时，许多内容（包括列的编号）都可能会发生变化。正如他所说：由于所有列索引都是在第一次打开类型域时被缓存的，因此后续的架构更改不会被反映出来。

我认为你不应该摆弄你的架构，试图将奇怪的数据塞入数据库。如果您有要存储的数据，即不主键，请在架构中为其创建一个位置，但不要尝试将其用作主键。

RealmObjectSchema.removePrimaryKey和columnIndex小于0

1 个答案: