Django DRF 相关命令三

一对多关系中，通常外键设置在多的表中，一的表中就没有相关字段，所以要想查询一的表中关联的多的副表，可以在建Model的时候在多的外键字段上添加related_name参数，来进行反向查询。这样在序列化.py中就可以使用“关联名”=关联表的序列化类进行序列化副表内容。

例如：

class Album(models.Model):
    album_name = models.CharField(max_length=100)
    artist = models.CharField(max_length=100)

class Track(models.Model):
    album = models.ForeignKey(Album, related_name='tracks', on_delete=models.CASCADE)
    order = models.IntegerField()
    title = models.CharField(max_length=100)
    duration = models.IntegerField()
class Meta:
        unique_together =['album','order']
        ordering =['order']
def__str__(self):
return'%d: %s'%(self.order, self.title)





AlbumSerializer

class TrackSerializer(serializers.ModelSerializer):

    class Meta:
        model = Track
        fields =['order','title','duration']

class AlbumSerializer(serializers.ModelSerializer):
    tracks = TrackSerializer(many=True)
    class Meta:
        model = Album
        fields =['album_name','artist','tracks']