java - 在 Spring 数据 Neo4j 中访问 @RelationshipEntiry 中的属性

Question

我正在使用 Neo4j 的 spring 数据。模型的初始设计如下所示:

@NodeEntity
public class User extends Neo4JBaseNode {
    @RelatedToVia(type = "HAS_DEVICE", elementClass = UserDevice.class, direction =       Direction.OUTGOING)  
    private List<Device> devices;
    .... ommited setters,getters
}



@NodeEntity
public class Device extends Neo4JBaseNode {
    private String type;
    private String manufacturer;
    private String model;
    private String os;
    .... ommited setters,getters
}

@RelationshipEntity(type = "HAS_DEVICE")
public class UserDevice {
   @StartNode
   private User user;
   @EndNode
   private Device device;
   private String deviceToken;
}

当从数据库检索用户时，我需要有“deviceToken”，但我不知道如何实现这一点。非常感谢任何帮助。

Answer 1

也许使用@RelatedToVia来注入(inject)UserDevices而不是Devices，确保你@Fetch它(如果需要)，然后你就可以访问关系属性以及实体属性。 IE。通常你会使用

@RelatedTo
Set<Device> ... (if you don't care about the relationship properties)

或者

@RelatedToVia
Set<UserDevice> ... (if you care about the relationship as well as the end nodes)