Question

给定一个具有一组预订对象的简单事件模型：

事件：

@Entity
public class Event {

   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long eventId;
   private Date start;
   private Date end;
   private String title;

   @OneToMany(mappedBy="event")
   private Set<Booking> Bookings;

   protected Event() {
       // for JPA
   }
   // Getters and setters omitted for brevity
}

预订

@Entity
public class Booking { 

   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long bookingId;
   private String title;
   private String contact;

   @ManyToOne
   @JoinColumn(name="event_id", nullable=false)
   private Event event; 

   public Booking() {
      // for JPA
   }
   // Getters and setters omitted for brevity
}

每个人都有一个JpaRepository界面，我已经创建了一个投影，以便我可以在检索事件时包含预订的详细信息。

@Projection(name="with-booking", types=Event.class)
public interface EventWithBookingProjection {

    public Date getStart();
    public Date getEnd();
    public String getTitle();
    public List<Booking> getBookings();
}

这样做可以正确地返回预订，但是预订对象没有像我自己检索它们那样的_links对象。如何使用相关链接检索预订对象，以便我可以对已检索的预订对象执行操作？

即。而不是：

{  
   "id":1,
   "title":"Test Title",
   "bookings":[  
      {  
         "title":"Test 1",
         "contact":"Contact 1"
      },
      {  
         "title":"Test 2 ",
         "contact":"Contact 2"
      }
   ],
   "end":"2015-06-06T11:30:00.000+0000",
   "start":"2015-06-06T09:00:00.000+0000",
   "_links":{  
      "self":{  
         "href":"http://localhost:8080/rest/events/1{?projection}",
         "templated":true
      },
      "bookings":{  
         "href":"http://localhost:8080/rest/events/1/bookings"
      }
   }
}

我想得到：

    {  
   "id":1,
   "title":"Test Title",
   "bookings":[  
      {  
         "title":"Test 1",
         "contact":"Contact 1",
         "_links":{  
            "self":{  
               "href":"http://localhost:8080/rest/bookings/23{?projection}",
               "templated":true
            },
            "event":{  
               "href":"http://localhost:8080/rest/bookings/23/event"
            }
         }
      },
      {  
         "title":"Test 2 ",
         "contact":"Contact 2",
         "_links":{  
            "self":{  
               "href":"http://localhost:8080/rest/bookings/24{?projection}",
               "templated":true
            },
            "event":{  
               "href":"http://localhost:8080/rest/bookings/24/event"
            }
         }
      }
   ],
   "end":"2015-06-06T11:30:00.000+0000",
   "start":"2015-06-06T09:00:00.000+0000",
   "_links":{  
      "self":{  
         "href":"http://localhost:8080/rest/events/1{?projection}",
         "templated":true
      },
      "bookings":{  
         "href":"http://localhost:8080/rest/events/1/bookings"
      }
   }
}

Answer 1

这已在spring-data的最新快照版本中得到解决，默认情况下包含链接。通过更新我的POM以包含下面的那些节目，链接出现在嵌入式集合

上

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-rest-webmvc</artifactId>
        <version>2.4.0.M1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-commons</artifactId>
        <version>1.11.0.M1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-rest-core</artifactId>
        <version>2.4.0.M1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-jpa</artifactId>
        <version>1.9.0.M1</version>
    </dependency>

Spring JPA Projection包括链接

1 个答案: