android – 带List的Realm查询

String [] ids;

realm.where(Drinks.class).equalsTo("country.id",ids);

public class Drinks extends RealmObject {
    @primaryKey
    private String id;
    private String name;
    private Country country;
}

public class Country extends RealmObject {
    @primaryKey
    private String id;
    private String name;
}

你理想的是理论上的链接查询(搜索“country.id”),但是链接查询很慢.此外,您需要将一堆或()谓词连接在一起,我不会冒险使用链接查询.

我建议使用以下内容

public class Drinks extends RealmObject {
    @primaryKey
    private String id;
    private String name;
    private Country country;
    @Index
    private String countryId;
}

public class Country extends RealmObject {
    @primaryKey
    private String id;
    private String name;
}

在类中设置Country时,还将countryId设置为country.getId().

一旦你这样做,你可以构建这样的：

RealmQuery<Drinks> drinkQuery = realm.where(Drinks.class);
int i = 0;
for(String id : ids) {
    if(i != 0) {
        drinkQuery = drinkQuery.or();
    }
    drinkQuery = drinkQuery.equalTo("countryId",id);
    i++;
}
return drinkQuery.findAll();