我想在保存實例模型的同時用函數填充模型的artist字段。Albumpre_saveMusicianmodels.pyclass Musician(models.Model):    first_name = models.CharField(max_length=50)    last_name = models.CharField(max_length=50)    instrument = models.CharField(max_length=100)    def __str__(self):        return self.first_nameclass Album(models.Model):    artist = models.ForeignKey(Musician, on_delete=models.CASCADE)    name = models.CharField(max_length=100)    release_date = models.DateField(null=True,blank=True)    num_stars = models.IntegerField(null=True,blank=True)    def __str__(self):        return self.artist@receiver(pre_save,sender = Musician)def create_album(sender,instance,**kwargs):    sm = Album()    sm.artist = instance    sm.save()但是，當我嘗試從管理員創建音樂人模型的實例時，按保存按鈕時會顯示此錯誤。Exception Type: ValueError at /admin/sig/musician/add/Exception Value: save() prohibited to prevent data loss due to unsaved related object 'artist'.我不明白如何解決此 sm.save() 錯誤！請幫助我。