From ac12b72751b43609ffe526287c1fd0b60ab02eae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E9=9B=AA=E5=B0=94?= <st2311061234@student.local>
Date: Mon, 22 Dec 2025 04:09:18 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20src/main/java/com/vibevaul?=
 =?UTF-8?q?t/model/Playlist.java?=
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---
 .../java/com/vibevault/model/Playlist.java    | 59 ++++++++++++-------
 1 file changed, 39 insertions(+), 20 deletions(-)

diff --git a/src/main/java/com/vibevault/model/Playlist.java b/src/main/java/com/vibevault/model/Playlist.java
index 129868f..9e3c03f 100644
--- a/src/main/java/com/vibevault/model/Playlist.java
+++ b/src/main/java/com/vibevault/model/Playlist.java
@@ -2,13 +2,12 @@ package com.vibevault.model;
 
 import jakarta.persistence.*;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 /**
  * 歌单实体类
- * 
- * 需要实现：
+ *
+ * 需要实现:
  * - 将此类映射为数据库表 "playlists"
  * - id 作为自增主键
  * - name 不能为空
@@ -16,28 +15,56 @@ import java.util.List;
  * - 一个歌单包含多首歌曲（一对多关系）
  * - 删除歌单时应级联删除其中的歌曲
  */
+@Entity // 实现：将此类映射为数据库表
+@Table(name = "playlists") // 实现：指定表名为"playlists"
 public class Playlist {
 
+    @Id // 实现：标记id为主键
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // 实现：id作为自增主键
     private Long id;
 
+    @Column(nullable = false) // 实现：name不能为空
     private String name;
 
+    // 实现：每个歌单属于一个用户（多对一关系）
+    @ManyToOne(fetch = FetchType.LAZY, optional = false) // 多对一，用户不能为空
+    @JoinColumn(name = "user_id") // 数据库中关联用户的字段名
     private User owner;
 
+    // 实现：一个歌单包含多首歌曲（一对多关系） + 删除歌单时级联删除歌曲
+    @OneToMany(mappedBy = "playlist", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<Song> songs = new ArrayList<>();
 
-    protected Playlist() {
+    public Playlist() {
     }
 
+    // 带参数的构造方法（方便创建歌单）
     public Playlist(String name, User owner) {
         this.name = name;
         this.owner = owner;
     }
 
+    // 维护双向关系：添加歌曲到歌单
+    public void addSong(Song song) {
+        songs.add(song);
+        song.setPlaylist(this);
+    }
+
+    // 维护双向关系：从歌单移除歌曲
+    public void removeSong(Song song) {
+        songs.remove(song);
+        song.setPlaylist(null);
+    }
+
+    // 必要的getter/setter方法
     public Long getId() {
         return id;
     }
 
+    public void setId(Long id) {
+        this.id = id;
+    }
+
     public String getName() {
         return name;
     }
@@ -50,23 +77,15 @@ public class Playlist {
         return owner;
     }
 
+    public void setOwner(User owner) {
+        this.owner = owner;
+    }
+
     public List<Song> getSongs() {
-        return Collections.unmodifiableList(songs);
+        return songs;
     }
 
-    /**
-     * 向歌单添加歌曲
-     * 提示：需要维护双向关系
-     */
-    public void addSong(Song song) {
-        // TODO: 实现添加歌曲逻辑
+    public void setSongs(List<Song> songs) {
+        this.songs = songs;
     }
-
-    /**
-     * 从歌单移除歌曲
-     * 提示：需要维护双向关系
-     */
-    public void removeSong(Song song) {
-        // TODO: 实现移除歌曲逻辑
-    }
-}
+}
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