models.py

class Track(models.Model):
  name = models.CharField()
  is_deleted = models.BooleanField(default=False)
  album = models.ForeignKey(Album, related_name="tracks") 

class Album(models.Model):
  name = models.CharField()

serializers.py

class TrackSerializer(serializers.ModelSerializer):
  
    class Meta:
      model = Track
      
class AlbumSerializer(serializers.ModelSerializer):
    tracks = TrackSerializer(many=True)
    ### How do I limit tracks in the related/nested serializer to tracks on this album that have not been deleted?