Question

解决方案：我解决了它，这是新的RestUser.java，如果它可以帮助将来的任何人

@RequestMapping(value="/rate", method=RequestMethod.POST)
public ResponseEntity rate(@RequestBody Rating rating, Principal principal){

    User user = userService.findByUsername(principal.getName());
    Rating ratingAVG = ratingService.findOne(user.getId());
    ratingAVG.setFood(rating.getFood());
    ratingAVG.setService(rating.getService());
    user.setRating(ratingAVG);
    ratingAVG.setUser(user);
    userService.save(user);

    return new ResponseEntity("Rated!", HttpStatus.OK);
}

问题

插入/更新具有外国人密钥的对象时出现问题。我有一个名为Rating的表，看起来像这样。我想添加一个唯一的Rating对象，该对象将当前user_id与principal.getName()一起使用。我正在使用高级REST客户端来测试它并且已经登录

+------------------------------------------------+
|                     Rating                     |
+------------------------------------------------+
| id |    food     |    service     |   user_id  |
+----+-------------+----------------+------------+
|  1 |     5       |        5       |      1     |
+----+-------------+----------------+------------+

User.java

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="Id", nullable=false, updatable=false)
private long id;

private String username;
private String password;
private String firstName;
private String lastName;

@OneToOne(cascade=CascadeType.ALL, mappedBy="user")
@JoinColumn(name="user_id", unique=true)
private Rating rating;

Rating.java

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long id;

private int food;
private int service;

@OneToOne(cascade = CascadeType.ALL)
@JsonIgnore
private User user;

RatingServiceimpl.java

@Service
public class RatingServiceImpl implements RatingService {

    @Autowired
    private RatingRepository ratingRepository;

    @Override
    public Rating save(Rating rating) {
        return ratingRepository.save(rating);
    }

}

UserRest.java

@RestController
@RequestMapping("/user")
public class UserRest {

    @Autowired
    UserService userService;

    @Autowired
    RatingService ratingService;


    @RequestMapping(value="/rate", method=RequestMethod.POST)
    public ResponseEntity rate(@RequestBody Rating rating, Principal principal){

        User user = userService.findByUsername(principal.getName());
        user.setRating(rating);
        rating.setUser(user);
        userService.save(user);

        return new ResponseEntity("Rated!", HttpStatus.OK);
    }

}

这就是我得到的，它添加了一个新对象，而我只是想让它更新现有的对象。

MySQL Browser Screen

谢谢！

Answer 1

看起来您正在通过我们设置用户来保存评级。我没有看到任何'@Transaction'注释，因此我假设您的交易在'RatingRepository'内，这意味着您在将评级设置为用户之前将提交您的交易。

尝试在调用save之前将用户设置为等级。

使用Principal REST进行hibernate @OneToOne映射

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