通过Android Java中的主键获取Realm对象的正确方法 [英] Proper way to get Realm object by its primary key in Android Java

问题描述

我想知道是否有一种正确的方法来检索一个对象，因为它在Realm for Android中具有主键。我知道方法 objectForPrimaryKey 确实存在于Swift中，但在Realm for Android中似乎没有这样的对应物。我真的认为做 realm.where（EventInfo.class）.equalTo（id，eventInfo.id）.findFirst（）; 看起来很浪费（at至少它不是手腕友好的）。我错过了一些方法吗？我目前正在使用Realm 1.0.1

I wonder if there's a proper way to retrieve an object given its primary key in Realm for Android. I know the method objectForPrimaryKey does exists in Swift but there seems to be no such counterpart in Realm for Android. I really think that doing realm.where(EventInfo.class).equalTo("id", eventInfo.id).findFirst(); looks like a lot of waste (at least it is not wrist-friendly). Am I missing some method? I'm Currently using Realm 1.0.1

推荐答案

这就是为什么我有像这样的Realm存储库（我写的）

This is why I have a Realm repository like this one (which I wrote)

public class CalendarEventRepositoryImpl
        extends LongRealmRepositoryImpl<CalendarEvent>
        implements CalendarEventRepository {
    public CalendarEventRepositoryImpl() {
        super(CalendarEvent.class);
    }

    @Override
    public Long getId(CalendarEvent calendarEvent) {
        return calendarEvent.getId();
    }

    public void setId(CalendarEvent calendarEvent, Long id) {
        calendarEvent.setId(id);
    }

    public String getIdFieldName() {
        return CalendarEventFields.ID;
    }
}

我继承了一个名为 findOne（realm，id）; like

and I inherit a method called findOne(realm, id); like

CalendarEvent event = calendarEventRepository.findOne(realm, id);

但是，默认情况下，它是 realm.where（CalendarEvent.class） .equalTo（id，id）.findFirst（）;

But yes, by default, it's realm.where(CalendarEvent.class).equalTo("id", id).findFirst();

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