Question

我想制作一个基于Django的音乐库。所以，我有基本的歌曲模型，专辑在＆＃39; shop＆＃39;用户收集的应用和复制模型。我想知道，当用户创建某个专辑的副本时，有没有办法添加与专辑相关的歌曲？

商店应用的基本型号：

class Album(models.Model):
    artist = models.ForeignKey(Artist)
    name = models.CharField(max_length=128)
    year = models.IntegerField(default=timezone.now().year)
    genre = models.ForeignKey(Genre)
    songs = models.ManyToManyField('Song', blank=True)
    cover = models.ImageField(upload_to=cover_album_directory_path)

    is_single = models.BooleanField()
    is_ep = models.BooleanField()
    is_compilation = models.BooleanField()

    def __str__(self):
        return self.name


class Song(models.Model):
    artist = models.ForeignKey(Artist)
    related_album = models.ForeignKey(Album)
    album_position = models.IntegerField()
    name = models.CharField(max_length=128)

    lyrics = models.TextField(blank=True)
    track = models.FileField(upload_to=song_directory_path)

    def __str__(self):
        return self.name

专辑和歌曲副本的模型：

class CopyAlbum(models.Model):
    owner = models.ForeignKey(Library)
    album = models.ForeignKey(Album, blank=True)

    def __str__(self):
        return self.album.name

class CopySong(models.Model):
    owner = models.ForeignKey(Library)
    song = models.ForeignKey(Song, blank=True)

    def __str__(self):
        return self.song.name

我真正需要的是：在创建复制专辑后，Django必须自动保存与专辑相关的copysongs。

感谢您的帮助。

Answer 1

您可以使用信号。

在CopyAlbum，CopySong模型文件中：

from django.db.models.signals import post_save,post_delete
from django.dispatch import receiver

@receiver(post_save,sender=CopyAlbum)
def copy_songs(*args,**kwargs):

 copy_album_instance = kwargs['instance']
 ... copy the songs ...

@receiver(post_delete,sender=CopyAlbum)
def delete_songs(*args,**kwargs):

 copy_album_instance = kwargs['instance'] ## deleted, an instance w/o db record
 ... delete the songs ...

自动添加歌曲与专辑

1 个答案: