百里香顯示本書作者列表

Question

我被一個問題困住了。我想從我的數據庫中顯示所有書籍作爲列表，更重要的是，他們每個人都顯示它的列表作者。這是我的控制器方法看起來像：

@RequestMapping(value="/new",method = RequestMethod.GET) 
    public ModelAndView newBooks() { 
     List<Book> books = bookRepository.findAllByOrderByPremiereDateDesc(); 
     Set<Author> authors = new HashSet<>(); 
     for(Book b:books){ 
      authors = b.getAuthors(); 

     } 

     Map<String, Object> model = new HashMap<String, Object>(); 
     model.put("books",books); 
     model.put("authors", authors); 

     return new ModelAndView("books/new","model",model); 
    } 

，但我不知道如何鏈接書及其作者在我看來，正確顯示它們：

<table> 
     <tr> 
      <th>Title</th> 
      <th>Title original</th> 
      <th>Premiere date</th> 
      <th>Authors</th> 
     </tr> 
     <tr th:each="b : ${model.books}"> 
      <td th:text="${b.title}"></td> 
      <td th:text="${b.titleOriginal}"></td> 
      <td th:text="${b.premiereDate}"></td> 
     <tr th:each="a: ${b.authors}"> 
      <td th:text="${a.name}"></td> 
      <td th:text="${a.surname}"></td> 
     </tr> 

    </table> 

而且我書（實體）模型類：

@Entity 
@Table(name = "book") 
public class Book { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "book_id") 
    private int bookId; 
    @Column(name = "isbn") 
    private long isbn; 
    @Column(name = "title") 
    private String title; 
    @Column(name = "title_original") 
    private String titleOriginal; 
    @Column(name = "premiere_date") 
    private Date premiereDate; 
    @ManyToMany(cascade = CascadeType.ALL) 
    @JoinTable(name = "book_author", joinColumns = {@JoinColumn(name = "book_id")}, inverseJoinColumns = {@JoinColumn(name = "author_id")}) 
    private Set<Author> authors = new HashSet<Author>(); 

Answer 1

<table> 
<span th:each="b: ${model.books}"> 
    <td> 
     <tr th:each="a: ${b.authors}"> 
      <p th:text="${a.name}"></p> 
     </tr> 
    <td> 
</span> 

嘗試嵌套循環！