Ebean/Play框架关系未更新

我正在使用Ebean和Java的play framework 2.3.3。我有以下型号（我实现getter和setter）：Ebean/Play框架关系未更新

@Entity 
public class Follow { 

    @ManyToOne 
    private User follower; 

    @ManyToOne 
    private User followed; 
}

和

@Entity 
public class User { 

    @Id 
    @GeneratedValue 
    private long id; 

    @OneToMany(mappedBy = "followed") 
    private Set<Follow> followers; 

    @OneToMany(mappedBy = "follower") 
    private Set<Follow> following; 

    public void addFollowing(Follow f) { following.add(f); } 
    public void addFollower(Follow f) { followers.add(f); } 
}

，并测试了这种关系，我有：

@Test 
public void userFollowTest() { 
    User a = new User(); 
    User b = new User(); 
    Follow follow = new Follow(a, b); // a follows b 
    a.addFollowing(follow); 
    b.addFollower(follow); 

    Ebean.beginTransaction(); 
    Ebean.save(a); 
    Ebean.save(b); 
    Ebean.save(follow); 
    Ebean.commitTransaction(); 

    Assert.assertEquals("Number of users", 2, User.find.all().size()); 
    Assert.assertEquals("Number of following of user A", 1, User.find.byId(1L).getFollowing().size()); 
    Assert.assertEquals("Number of followers of user B", 1, User.find.byId(2L).getFollowers().size()); 
    Assert.assertEquals("Number of follows", 1, Follow.find.all().size()); 
}

但这个工程：

Assert.assertEquals("Number of users", 2, User.find.all().size()); 
Assert.assertEquals("Number of following of user A", 1, a.getFollowing().size()); 
Assert.assertEquals("Number of followers of user B", 1, b.getFollowers().size()); 
Assert.assertEquals("Number of follows", 1, Follow.find.all().size()); 
Assert.assertTrue("User a is follower and User b is followed", follow.getFollower().getId() == 1 && 
      follow.getFollowed().getId() == 2);

问题是，尽管在数据库中创建了用户和后续内容，但第二个和第三个断言失败（这是用户没有任何后续操作）。我试图先创建用户，然后遵循，但它仍然无法正常工作。

来源

2014-08-31 André Rodrigues

已解决。看来解决方案是在实体Follow中创建一个ID字段。我试图把这两个字段作为id，但Ebean不接受它，所以我最终使用了long类型的id。

来源

2014-08-31 22:13:26

Ebean/Play框架关系未更新

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