我有一個帶有 ManyToMany 字段的模型，每次創(chuàng)建對象時，我都需要使用之前創(chuàng)建的相同電話或電子郵件在數(shù)據(jù)庫中搜索更多對象?，F(xiàn)在，我正在使用 post_save 信號來做到這一點，但我想知道是否有更好的方法來做到這一點，也許在創(chuàng)建序列化程序上。class Leads(models.Model):      name = models.CharField(max_lenght=40)      phone = models.CharField(max_lenght=14)      email = models.EmailField()      other_leads = models.ManyToManyField('Leads')      created = models.DateTimeField(auto_now_add) @receiver(post_save, sender=Leads) def add_related(sender, instance, created, **kwargs)      if created:          [instance.other_leads.add(lead) for lead in Leads.objects.filter(email=instance.email, created__lt=instance.created)]