Question

我在使用Neo Boot保持neo4j RelationshipEntity时遇到问题。我正在使用spring-boot-starter-data-neo4j（2.1.0.RELEASE），并且neo4j docker镜像标记为3.4.9。

我有一个简单的NodeEntity，其中包含RelationshipEntity的集合：

@NodeEntity
public class Book {
    @Id
    @GeneratedValue
    private Long id;
    private String name;

    public Book() {}

    public Book(String name) {
        this.name = name;
    }

    @Relationship(type = "PURCHASED_WITH", direction = "OUTGOING")
    private Set<BookPurchase> purchases = new HashSet<>();

    // getters and setters follow
}

我有另一个NodeEntity，它也包含关系实体的集合：

@NodeEntity
public class CreditCard {

    @Id
    @GeneratedValue
    private Long id;
    private String number;

    @DateString(value = "yyyy-MM-dd")
    private Date expiryDate;

    public CreditCard() {}

    public CreditCard(String number, Date expiryDate) {
        this.number = number;
        this.expiryDate = expiryDate;
    }

    @Relationship(type = "PURCHASED_WITH", direction = "INCOMING")
    private Set<BookPurchase> purchases = new HashSet<BookPurchase>(); 

    // getters and setters follow
}

我有RelationshipEntity，它在构造函数中添加了对两个NodeEntity类的引用：

@RelationshipEntity(type = "PURCHASED_WITH")
public class BookPurchase {
    @Id
    @GeneratedValue
    private long id;

    @DateString("yyyy-MM-dd")
    Date purchaseDate;

    @StartNode
    private Book book;

    @EndNode
    private CreditCard card;

    public BookPurchase(){}

    public BookPurchase(CreditCard card, Book book, Date purchaseDate) {
        this.card = card;
        this.book = book;
        this.purchaseDate = purchaseDate;

        this.card.getPurchases().add(this);
        this.book.getPurchases().add(this);
    }
    // getters and setters follow
}

最后，我让Spring控制器将所有内容捆绑在一起：

@RestController
public class ExamplesController {

    @Autowired
    CreditCardRepository creditCardRepository;

    @PostMapping(value="/purchases")
    public String createPurchases() {
        CreditCard card = new CreditCard("11111", new GregorianCalendar(2018, Calendar.FEBRUARY, 12).getTime());

        Book book1 = new Book("of mice and men");
        BookPurchase purchase1 = new BookPurchase(card,book1,new GregorianCalendar(2018, Calendar.MARCH, 15).getTime());

        creditCardRepository.save(card);
        return "Successfully created entities";
    }
}

每当我尝试curl -X POST http://localhost:8080/purchases时，我只会在neo4j浏览器中看到以下内容-RelationshipEntity不会持久化，只会持久化节点。

有人可以协助吗？

Answer 1

感谢Gerrit Meier回答了这一问题。我的RelationshipEntity使用的是原语long而不是对象/包装器Long。这里的完整详细信息：https://community.neo4j.com/t/neo4j-relationshipentity-not-persisted/3039

neo4j RelationshipEntity未创建

1 个答案: