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我将昆德拉与 Mongo 和 Play 2.1.3 一起使用。我的应用程序有一个用户实体和一个文档实体。用户有多个文档（oneToMany），一个文档属于一个用户。我首先创建并保留用户，然后可以将文档添加到该用户。当我创建一个 Document 并将其持久化时，引用 User 的 userID 与 User 实体的 userID 不同。并且用户文档 ArrayList 也始终为空。

So here's relevant parts of my entities:

@Entity(name="User")
@Table(name="User", schema="xpto@mongo")
public class User {

    @GeneratedValue
    @Id
    @Column(name="_id")
    private String userID;

    @Required
    @Column(name="name")
    private String name;
    (...)

    @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy="owner")
    private List<Document> documents;
    (...)
}


@Entity(name="Document")
@Table(name="Document", schema="xpto@mongo")
public class Document {

    @GeneratedValue 
    @Id
    @Column(name="_id")
    private String documentID;

    @Required
    @Column(name="name")
    private String name;

    (...)

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="userID")
    private User owner;
    (...)
}

--

The user is created and persisted. The documents are created afterwards with something like the following:

public static void createDocument(String name, User user) {
EntityManagerFactory emf = Application.getEmf();
    Document document = new Document();
    document.setName(name);
    ...
    EntityManager em = emf.createEntityManager();
    document.setOwner(user);
    em.persist(document);
    em.close();
}

In the db:
db.User.find()
{ "_id" : "5211067576aae40da0595eb0", "name" : "Name of the user" (...) }

db.Document.find()
{ "_id" : "52113c1376aae337b4537028", "name": "name", "userID" : "52113c1376aae337b4537029" }

I was expecting the userID in the document to be the same as the User _id.
As I said when I try to access the user's documents ArrayList it's always null.

What am I doing wrong here? :)
Thanks in advance.
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1 回答 1

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在 kundera-discuss 小组中回答。

于 2013-08-22T08:36:25.023 回答