显示有条件的多图像

Question

我尝试显示图库的一部分照片=＆gt;这是我search action时的结果。此结果为avatar，如picture和infomation，如username or email。

我在关系Photo.java中创建了child Users.java @ManytoOne

这是我的代码：

Photo.java ----

@Entity
public class Photo extends Model{
    @Id
    public Long id;

    public String path;

    @ManyToOne
    @JoinColumn(name = "user_id")
    public Users user;

}

Users.java -----

@Entity
public class Users extends Model{
        @Id
    public Long id;

    @Constraints.Required
    public String username;

    @Constraints.Required
    public String email;

    @Constraints.Required
    public String password;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
        public List<Photo> photo = new ArrayList<Photo>();

    public Users(){}

    public Users(String username,String email,String password){
        this.username=username;
        this.email=email;
        this.password=password;
    }
}

Search.java -----

public static Result search(){
            DynamicForm form = form().bindFromRequest();
            String name = form.get("name");
            Finder<Long, Users> find = new Finder<Long, Users>(Long.class, Users.class);
            List<Users> users = find.where().like("username", '%'+ name +'%').findList();


            if (form.get("name")=="" || users.isEmpty() || users==null){
              return ok(search_again.render()); 
          }
          else{       
        return ok (search_result.render(users));
          }
    }

search_result.scala.html ----

@(users : List[Users])
@main(nav= "search"){
    <h3>Result</h3>

    <a href="@routes.Search.blank"><input class="button" type="button" value="Back to Search"></a>
    <a href="@routes.Application.index"><input class="button" type="button" value="Back to Home"></a>

    <p>Found @users.size() result(s) : </p>

    <div class="sresult">
        @for(user <- users){

        <div id="sresult">
        <div id="haha"><img src="@routes.Assets.at("upload/"+user.photo.path)"></div>
//Error here.  Why "user.photo.path" not working ?
            <p>
               @user.username</a></br>
               @user.password</a></br>
               @user.email</a>
            </p>
        </div>
        }

    </div>
}

为什么“user.photo.path”无效？在我的情况下任何理想？