Question

早上好，我在Android应用程序中用对象更新了我的appengine后端，我从asincona类中调用了后端。在阅读了几个教程之后，我设法获取，更新，插入和删除了一个实体，但是这个实体包含了另一种实体的arraylist，当我想做一个get时，没有问题，因为主实体让我访问在实体列表中，我甚至设法进行插入，但在进行更新和删除时，我无法使其工作。

示例实体用户有一个照片实体列表：

@Entity
public class UserEntity {
@Id
String id;
private String mail;
private String name;
private ArrayList<PhotoEntity> listPhotos = new ArrayList<>();

//constructor
public UserEntity(){}

getters & setters....
}

照片实体：

@Entity
public class PhotoEntity {
@Id
Long id;
private String author;
private int height;
private int widht;
private Blob image;

//constructor
public PotoEntity() {}

getters & setters.....
}

UserEntity的终点

插入方法有效：

@ApiMethod(
        name = "insertUserPhoto",
        path = "userEntityPhoto",
        httpMethod = ApiMethod.HttpMethod.POST)
public UserEntity insertUserPhoto(@Named("idUser")String idUser, UserPhotoEntity userPhoto) throws NotFoundException {
    UserEntity userEntity = null;
    userEntity = ofy().load().type(UserEntity.class).id(idUser).now();
    if (userEntity == null) {
        throw new NotFoundException("Could not find UserEntity with ID: " + idUser);
    }
    userEntity.getListPhotos().add(userPhoto);
    ofy().save().entity(userEntity).now();
    logger.info("Created UserPhotoEntity with ID: " + userPhoto.getId());

    return ofy().load().entity(userEntity).now();
}

更新方法不起作用：

@ApiMethod(
        name = "updateUserPhoto",
        path = "userEntityPhoto/{id}",
        httpMethod = ApiMethod.HttpMethod.PUT)
public UserEntity updateUserPhoto(@Named("idUser") String idUser,
                                          @Named("idPhoto") String idPhoto) throws Exception {

    UserEntity userEntity = null;
    UserPhotoEntity userPhotoTemp = null;

    userEntity = ofy().load().type(UserEntity.class).id(idUser).now();
    if (usuarioEntity == null) {
        throw new NotFoundException("Could not find UserEntity with ID: " + idUser);
    }

    for(int i = 0; i < userEntity.getListPhotos().size(); i++){
        if(userEntity.getListPhotos().get(i).getId().equalsIgnoreCase(idPhoto)){
            userPhotoTemp = userEntity.getListPhotos().get(i);
            userPhotoTemp.setAuthor("code changed");

            userEntity.getListPhotos().get(i).remove();
            userEntity.getListPhotos().add(userPhotoTemp);

            ofy().save().entity(userEntity).now();
            break;
        }
    }

    logger.info("Updated UserPhotoEntity: " + userEntity);
    return ofy().load().entity(userEntity).now();
}

删除方法不起作用：

@ApiMethod(
        name = "removeUserPhoto",
        path = "userEntityPhoto/{id}",
        httpMethod = ApiMethod.HttpMethod.DELETE)
public void removeUserPhoto(@Named("idUser") String idUser,
                                 @Named("idPhoto") String idPhoto) throws NotFoundException {

    UserEntity userEntity = null;

    userEntity = ofy().load().type(UserEntity.class).id(idUser).now();
    if (userEntity == null) {
        throw new NotFoundException("Could not find UserEntity with ID: " + idUser);
    }

    for(UserPhotoEntity upe : userEntity.getListPhotos()){
        if(upe.getId().equalsIgnoreCase(idPhoto)){
            ofy().delete().entities(upe);
            break;
        }
    }

    logger.info("Deleted UserEntity with ID: " + idPhoto);
}

有人可以帮助我，当有实体列表时，我应该如何管理端点方法？

谢谢。

Answer 1

这将创建并嵌入实体我建议您更改为Ref：

@Entity
public class UserEntity {
@Id
String id;
private String mail;
private String name;
private List<Ref<PhotoEntity>> photoEntity= new ArrayList<Ref<PhotoEntity>>();

objectity如何处理其他实体中的实体

1 个答案: