@Entity
@Table(name = "TB_COMMENT")
public class Comment {
    @Id
    @PrimaryKeyJoinColumn
    // 主键生成存储的类型为UUID，自动生成UUID
//    @GeneratedValue(generator = "uuid")
    // 把uuid的生成器定义为uuid2，uuid2是常规的UUID toString
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    // 不允许更改，不允许为null
    @Column(updatable = false, nullable = false)
    private String id;

    //对应的评论者
    @JoinColumn(name = "senderId")
    //不可选,必须有一个发送者,急加载, 串联级别ALL
    @ManyToOne(optional = false, fetch = FetchType.EAGER , cascade = CascadeType.ALL)
    private User sender;

    @Column(insertable = false,updatable = false,nullable = false)
    private String senderId;


    //对应的接收人
    @JoinColumn(name = "receiverId")
    //不可选,必须有一个发送者,急加载, 串联级别ALL
    @ManyToOne(optional = false, fetch = FetchType.EAGER , cascade = CascadeType.ALL)
    private User receiver;

    @Column(insertable = false,updatable = false,nullable = false)
    private String receiverId;

    // 对应的帖子的id
    @JoinColumn(name = "postId")
    @ManyToOne(optional = false, fetch = FetchType.EAGER , cascade = CascadeType.ALL)
    private Post post;
    @Column(insertable = false,updatable = false,nullable = false)
    private String postId;

    // 此评论对应的回复集合
    //懒加载
    @JoinColumn(name = "commentId")
    @LazyCollection(LazyCollectionOption.EXTRA)
    @OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL)
    private Set<Reply> replies = new HashSet<>();

    //类容
    @Column(nullable = false)
    private String content;

    //附件
    @Column
    private String attach;

    //创建时间
    @CreationTimestamp
    private LocalDateTime createAt = LocalDateTime.now();


    public Comment(User sender,User receiver , Post post, WriteCommentModel model) {
        this.id = model.getId();
        this.sender = sender;
        this.post = post;
        this.content = model.getContent();
        this.receiver = receiver;
    }

    public Comment() {
    }

下面的就是些get set了