Neo4j OGM 字段未继承

Question

我运行遇到了 neo4j OGM library, I've followed the instruction on the library docs page 实现抽象 parent 实体以包含我的实体的所有共享字段和功能的问题。然后，当我用一个具体的继承此 class 并尝试执行 session.save 时，我收到此错误消息 MappingException: No identity field found for class: models.nodes.User。然后我尝试将 id 字段从 parent class 下拉到 child 具体 class 并且保存操作成功 - 但是 [=39 的其他字段=] class 没有保存到数据库中。我的结论是 OGM 出于某种原因忽略了 parent 字段。

这是我的 parent 摘要 class:

abstract public class MorpheusEntity {

    // Fields

    /**
     * The ID of the entity
     */
    @JsonProperty("id")
    @GraphId
    public Long id;

    /**
     * The date of first creation of the entity
     */
    @DateString
    private Date created;

    /**
     * The date of the last modification of the entity
     */
    @DateString
    private Date modified;

    // Constructors

    public MorpheusEntity() {
        this.created = new Date();
        this.modified = new Date();
    }

    // Methods

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || id == null || getClass() != o.getClass()) return false;
        MorpheusEntity entity = (MorpheusEntity) o;
        if (!id.equals(entity.id)) return false;
        return true;
    }

    @Override
    public int hashCode() {
        return (id == null) ? -1 : id.hashCode();
    }

    // Getters / Setters

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public Date getModified() {
        return modified;
    }

    public void setModified(Date modified) {
        this.modified = modified;
    }

}

这是我的具体 child class:

@NodeEntity
public class User extends MorpheusEntity {

    // Fields

    /**
     * Facebook ID of the user
     */
    private String facebookId;

    /**
     * First name of the user
     */
    private String firstName;

    /**
     * Last name of the user
     */
    private String lastName;

    /**
     * A URL address of the user avatar image
     */
    private String avatarURL;

    /**
     * A set of friends of the user
     */
    @Relationship(type = RelationshipNames.USER_FRIENDS, direction = Relationship.UNDIRECTED)
    private Set<User> friends;

    /**
     * A set of user connected devices
     */
    @Relationship(type = RelationshipNames.USER_DEVICES, direction = Relationship.OUTGOING)
    private Set<Device> devices;

    // Constructors

    // Methods

    // Getters / Setters

    public String getFacebookId() {
        return facebookId;
    }

    public void setFacebookId(String facebookId) {
        this.facebookId = facebookId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getAvatarURL() {
        return avatarURL;
    }

    public void setAvatarURL(String avatarURL) {
        this.avatarURL = avatarURL;
    }

    public Set<User> getFriends() {
        return friends;
    }

    public void setFriends(Set<User> friends) {
        this.friends = friends;
    }

    public Set<Device> getDevices() {
        return devices;
    }

    public void setDevices(Set<Device> devices) {
        this.devices = devices;
    }

}

我试过将 parent class 放在映射包内和外。 <<-- 编辑：这实际上是问题所在，parent class 未被 OGM

映射

我是否遗漏了一些必需的注释？我的 parent class 是不是映射不正确？我正在使用 Play Framework 2.4 和 Neo4j OGM version 1.1.4 来自 Maven 使用 SBT 构建器。

谢谢。

Answer 1

@NodeEntity 应该在父级 class 并且它将继承给子级 class。

请参阅文档中的 Entity Type Representation 部分

Answer 2

请检查创建 SessionFactory 时是否正在注册您的抽象 class 包。

Neo4j OGM 字段未继承

Neo4j OGM fields not inherited

java

neo4j

spring-data-neo4j

neo4j-ogm