如何访问 thymeleaf 中对象属性的属性？

Question

Say I want to access an object that is called post. Post has a instance variable called Category of type Category.

In the Java controller class

model.addAttribute("posts", postRepository.findPostsByUser(user));

In the thymeleaf html file I have

<tr data-th-each="post : ${posts}">

I am wondering if it is it possible to access the below?

{post.category.name}

For clarification I have included the java classes below. Each instance has associated setters and getters.

@Entity
public class Post {

@ManyToOne
@JoinColumn(name = "category_id")
private Category category;


@Entity
public class Category {

private String name;

Answer 1

I think you need to change your entity code

@Entity
public class Post {

   private Category category;

   @ManyToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "category_id", nullable = false)
   public Category getCategory () {
     return this.category;
   }

   public void setCategory (Category category ) {
     this.category = category ;
   }

}

you need implement thymeleaf html page as per following

<tr th:each="post : ${posts}">
   <td> <span th:utext="{post.category.name}" /></td>
</tr>

Hope its help to you!

Answer 2

you have to make a condition:

<tr th:each="post:${posts}">
    <td th:text="${post.category}!=null? ${post.category.name}:''"></td>
</tr>

:)