Spring RESTコントローラで@manytooneリレーションを使用したPOSTメソッド

Question

これは、双方向性のあるエンティティを持つRESTサービスを作成する最初の試みです。ManyToOneリレーション。コードは以下の通りです。

POSTリクエストを/ posts /に実行すると、毎回新しいカテゴリが作成され、JSONのカテゴリ部分を新しいカテゴリの名前として扱います。

Post.java

@Entity 
public class Post { 
    @Column(name = "post_id") 
    private Long id; 

    @Column(nullable = false, length = 255) 
    private String title; 

    @Column(nullable = false, length = 999999) 
    private String text; 

    private Category category; 

    // Constructors 
    public Post() { 
    } 

    public Post(String title, String text, Category category) { 
     this.title = title; 
     this.text = text; 
     this.category = category; 
    } 

    // Getters and Setters 


    @Id @GeneratedValue(strategy = GenerationType.IDENTITY) 
    public Long getId() { 
     return id; 
    } 

    public void setId(Long id) { 
     this.id = id; 
    } 

    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title; 
    } 

    public String getText() { 
     return text; 
    } 

    public void setText(String text) { 
     this.text = text; 
    } 

    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST) 
    @JoinColumn(name = "category_id") 
    public Category getCategory() { 
     return category; 
    } 

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

Category.java

@Entity 
public class Category { 
    @Column(name = "category_id") 
    private Long id; 

    @Column(nullable = false) 
    private String name; 

    @Column(nullable = false) 
    private String slug; 

    private List<Post> posts; 

    // Constructors 

    public Category() { 
    } 

    public Category(String name, String slug) { 
     this.name = name; 
     this.slug = slug; 
    } 

    public Category(String name) { 
     this.name = name; 
    } 

    // Adding posts to existing categories 

    public void addPost(Post post) { 
     this.posts.add(post); 
    } 

    // Getters and setters 

    @Id @GeneratedValue(strategy = GenerationType.IDENTITY) 
    public Long getId() { 
     return id; 
    } 

    public void setId(Long id) { 
     this.id = id; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getSlug() { 
     return slug; 
    } 

    public void setSlug(String slug) { 
     this.slug = slug; 
    } 

    @JsonIgnore @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "category") 
    public List<Post> getPosts() { 
     return posts; 
    } 

    public void setPosts(List<Post> posts) { 
     this.posts = posts; 
    } 

    // toString 


    @Override 
    public String toString() { 
     final StringBuffer sb = new StringBuffer("Category{"); 
     sb.append("id=").append(id); 
     sb.append(", name='").append(name).append('\''); 
     sb.append(", slug='").append(slug).append('\''); 
     sb.append(", posts=").append(posts); 
     sb.append('}'); 
     return sb.toString(); 
    } 
} 

PostController.java

@RequestMapping(value = "/posts") 
@RestController 
public class PostController { 

    @Autowired 
    PostRepository repository; 

    @RequestMapping(method = RequestMethod.GET) 
    public @ResponseBody List<Post> getAllPosts() { 
     return repository.findAll(); 
    } 

    @RequestMapping(method = RequestMethod.POST) 
    @ResponseStatus(HttpStatus.CREATED) public 
    @ResponseBody Post createPost(@RequestBody Post post) { 
     return repository.save(post); 
    } 
} 

Answer 1

public void addPost(Post post) { 
    this.posts.add(post); 
    post.setCategory(this); 
}