Realm Java 遷移：已要求屬性

Question

適用於大多數全新安裝，但在最新的應用程序更新后，很多報告都出現了此問題。 更新之間已經有一段時間了，所以我認為這可能是由於用戶在我添加架構之前從非常舊的版本更新造成的……但其他人說他們從全新安裝中看到了這一點。 Realm Java 是realm-gradle-plugin:5.1.1

我感謝任何幫助，謝謝！

錯誤：

Caused by io.realm.exceptions.RealmMigrationNeededException
Migration is required due to the following errors: - Property 'Loan.loanRatePct' has been made required.
...
...onCreate (Activity.java:168)

我的遷移.java

if (oldVersion == 0) {
    schema.get("Storage")
            .addField("heat", String.class);
    oldVersion++;
}

if (oldVersion == 1) {
    schema.get("Env")
            .addField("gameType", String.class);
    oldVersion++;
}

if (oldVersion == 2) {
    schema.get("Loan")
            .addField("loanRatePct", Double.class);
    schema.create("GameMode")
             .addField("md", String.class)
            .addField("name", String.class)
            .addField("days", int.class)
            .addField("term", int.class)
            .addField("rate", String.class)
            .addField("amount", int.class)
            .addField("icon", int.class);
    schema.create("Leaderboard")
            .addField("score", String.class);

    oldVersion++;
}

if (oldVersion == 3) {
    schema.get("Leaderboard")
            .addField("mode", String.class);
    oldVersion++;
}

我的應用程序

Realm.init(getApplicationContext());
    RealmConfiguration config = new RealmConfiguration.Builder()
            //todo: EVERY UPDATE: is new schema needed?
            .schemaVersion(4) // Must be bumped when the schema changes
            .migration(new MyMigration()) // Migration to run instead of throwing an exception
            .build();
    Realm.setDefaultConfiguration(config);

活動.java

protected void onCreate(Bundle savedInstanceState) {    
    realm = Realm.getDefaultInstance();
    ...
}

編輯：忘記了：

貸款.java

public class Loan extends RealmObject {
    String theloan;
    int loan;
    int loanRate;
    double loanRatePct;
    int loanBalance;
}

Answer 1

Double表示nullable double為nullable double 。

double表示non-null double 。

所以.addField("loanRatePct", Double.class); 應該是.addField("loanRatePct", double.class); .