从播放列表中获取歌曲

Question

Here is my Playlist model

class Playlist(models.Model):
    name = models.CharField(max_length=200, null=False, blank=False, default='')
    songs = models.ManyToManyField('Song')

    def __str__(self):
        return self.name

    @property
    def playlist_id(self):
        return self.id

It works fine, but how do I get the songs from the playlist?

Answer 1

Once you already got a playlist intance, you can do:

playlist.songs.all()

Or you could filter if you need to meet some criterion:

playlist.songs.filter(name__in=['song name 1', 'song name 2'])

Refer to the Django documentation on object retrieval for all the possibilities.