Question

我有一个让我的大脑生病的Realm的问题:(

问题是当我尝试将新对象添加到RealmList中时。插入对象但它没有与关系链接。

现在，我的数据库有多种关系：

用户 1 - ＆gt; M 旅行 1 - ＆gt; M 车辆 1 - ＆gt; M

然后：

车辆 1 - ＆gt; M VehicleInfo

VehicleInfo 1 - ＆gt; M 温度

当我尝试将新对象插入到Temperature类中时，问题就出现了。

我的班级：

车辆：

    @RealmClass
    public class Vehicle extends RealmObject
    {
        private String  state;                  //R: Reservado | P: Listo para embarcar | E: Embarcado | P1: Pdte. confirmar medidas | P2: Tª no válida | R1: No embarca
        private String  locata       = "";
        private String  customer     = "";
        private String  customerCode = "";
        private String  originPort   = "";      //Origin port
        private String  destinyPort  = "";      //Destiny port
        private int     fp;                     //Method pay (0 = CASH | 1 = CREDIT)

        //Relationship
        private Trip trip;                              //Inverse
        private RealmList<VehicleInfo>  vehicleInfo = new RealmList<>();    //One-to-many
        private RealmList<Observation> observations = new RealmList<>();;    //One-to-many
.....
}

VehicleInfo：

@RealmClass
public class VehicleInfo extends RealmObject {

    private String  sv;                  //Vehicle type
    private String  licensePlate  = "";  //License
    private String  seal          = "";  //Seal
    private String  temperature   = "";  //Temperature control
    private String  iv            = "";  //Ida/Vuelta
    private String  commodityCode = "";
    private int     tara          = 0;   //TARA
    private int     packages      = 0;   //Bultos
    private int     weight        = 0;
    private double  length        = 0.0; //Meters
    private boolean flagFT;              //Flag Technical data
    private boolean flagDua;
    private boolean flagManifest;
    private boolean flagTransport;
    private boolean flagDangerCommodity;

    //Relationship
    private RealmList<Temperature> temperatures = new RealmList<>();   //One-to-many
....
}

我添加新温度的代码：

Temperature temp = new Temperature();
temp.setDate(appCommon.getCurrentTimeOrDate("DATE"));
temp.setTime(appCommon.getCurrentTimeOrDate("TIME"));
temp.setValue(Double.parseDouble(etTemp.getText().toString()));

VehicleInfoPersistence.updateVehicleInfoTemperature(realm, vehicle.getLocata(), selectedUnitPosition, temp);
updateRecycler(tempRecyclerAdapter, temp);

在Realm中查找和保留的方法：

public static VehicleInfo findVehicleInfoFromLocata(Realm realm, String locata, int position) {
        RealmQuery<Vehicle> query = realm.where(Vehicle.class).equalTo("locata", locata);
        Vehicle realmVehicle = query.findFirst();

        return realmVehicle.getVehicleInfo().get(position);
    }

public static void updateVehicleInfoTemperature(Realm realm, String locata, int position, Temperature temperature) {

    Vehicle vehicle = VehiclePersistence.findVehicleFromLocata(realm, locata);

realm.beginTransaction();
Temperature realmTemp = realm.copyToRealm(temperature);
 vehicle.getVehicleInfo().get(position).getTemperatures().add(realmTemp);    
realm.commitTransaction();

}

我怎么说，对象是在数据库中创建的，但它没有与车辆链接 - ＆gt; vehicleInfo - ＆gt;温度。

我的代码有什么问题？

提前致谢：）

Answer 1

我解决了我的问题：）

根据某些动机，当我尝试将新对象添加到RealmClass的子数组中时，realm会失败。

为了解决这个问题，我创建了一个中间对象，然后我将对象添加到了这个中间对象。

public static void updateVehicleInfoTemperature(Realm realm, String locata, int position, Temperature temperature) {

    Vehicle vehicle = VehiclePersistence.findVehicleFromLocata(realm, locata);

    realm.beginTransaction();

    VehicleInfo vInfo            = vehicle.getVehicleInfo().get(position);
    VehicleInfo realmVehicleInfo = realm.copyToRealm(vInfo);
    Temperature realmTemp        = realm.copyToRealm(temperature);
    realmVehicleInfo.getTemperatures().add(realmTemp);

    realm.commitTransaction();
}

我希望能帮助别人：）

在Realm中将新对象添加到关系中

1 个答案: