Question

我目前正在尝试使用for循环删除模型中的特定领域对象，

但是每次我执行deleteFromRealm(i)时，它都会停止循环，并且我无法再删除其他对象。

我还没有尝试过其他选择。

final Realm realms = Realm.getDefaultInstance();
        realms.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                RealmResults<CashCountScoreModel> cashCountScoreModels =
                        CashCountScoreModel.getAll(realm);
                for (int i = 0; i < cashCountScoreModels.size(); i++) {
                    if (cashCountScoreModels.get(i) != null && cashCountScoreModels.get(i).isCashOnHand) {
                        Log.d("CheckName : pos -- ",  i +"~~" + cashCountScoreModels.get(i).isCashOnHand);
                        Log.d("CheckName : pos --",  i + "~~" + cashCountScoreModels.get(i).employeeName);
                        cashCountScoreModels.deleteFromRealm(i);
                    //    continue;
                    }
                }
            }
        });

每当我尝试运行该应用程序并执行此特定代码cashCountScoreModels.deleteFromRealm(i);时，它都会停止循环。

Answer 1

不确定所使用的Realm版本。但是从3.0.0开始，Realm集合处于活动状态，因此会立即更新。因此，CashCountScoreModels.size（）每次删除后返回的计数都会减少。就您而言，我怀疑您集合中只有2个条目。您可能要改用OrderedRealmCollectionSnapshot。试用以下代码。

final Realm realms = Realm.getDefaultInstance();
        realms.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {
                RealmResults<CashCountScoreModel> cashCountScoreModels = CashCountScoreModel.getAll(realm);
                OrderedRealmCollectionSnapshot snapshot = cashCountScoreModels.createSnapshot();
                for (CashCountScoreModel cashCountScoreModel : snapshot) {
                    if (cashCountScoreModel != null && cashCountScoreModel.isCashOnHand) {
                        Log.d("CheckName : pos -- ",  i +"~~" + cashCountScoreModel.isCashOnHand);
                        Log.d("CheckName : pos --",  i + "~~" + cashCountScoreModel.employeeName);
                        cashCountScoreModel.deleteFromRealm();
                    }
                }
            }
        });

在https://realm.io/docs/java/latest/上查找Iterations & snapshots或https://realm.io/docs/java/3.0.0/api/io/realm/OrderedRealmCollection.html#loops上可用的文档以了解集合和OrderedRealmCollectionSnapshot中更多的实时更新

Answer 2

发生这种情况是因为我认为您想从一个执行块中删除多个领域对象。尝试执行代码下面的代码。

RealmResults<CashCountScoreModel> cashCountScoreModels=realm.where(CashCountScoreModel.class).equalTo(CashCountScoreModel.isCashOnHand,true).findAll();
cashCountScoreModels.deleteAllFromRealm();

Answer 3

realm.executeTransaction(new Realm.Transaction() {
                        @Override
                        public void execute(Realm realm) {
RealmResults<CashCountScoreModel> cashCountScoreModels=realm.where(CashCountScoreModel.class).equalTo(CashCountScoreModel.isCashOnHand,true).findAll();
cashCountScoreModels.deleteAllFromRealm();
}
});

@Md。 Nowshad Hasan是正确的。只需在Realm Thread中运行即可。

Answer 4

您不应在循环内调用deleteFromRealm(i)，因为它总是会导致崩溃。请改用以下代码：

    realms.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            RealmResults<CashCountScoreModel> results = CashCountScoreModel.getAll(realm);
            results.where().equalTo("isCashOnHand", true).findAll().deleteAllFromRealm();
        }
    });

如何使用for循环删除特定领域对象

4 个答案: