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django - Django 删除主对象删除上的所有 M2M 相关对象

问题描述

class Project(models.Model):
   name = models.CharField(max_length=100)
   project_results_m2m =  models.ManyToManyField(Project_Results,blank=True)

   def delete_all(self): 
        pass ### TO BE ADDED FROM ANSWERS


@receiver(post_delete,sender=Project) 
def delete_project_signal(sender,instance,created=False,**kwargs):
    if created is False:
       instance.delete_all()

p = Project.objects.get(id=1)
p.delete()

现在我想删除与Project objectProject_Results相关的所有对象。project_results_m2m1

如何在删除时以安全的方式实现它，无论是有信号还是没有信号？

标签： djangodjango-modelsdjango-rest-frameworkdjango-formsdjango-templates

解决方案

可能您需要使用pre_delete信号：

from django.db.models.signals import pre_delete

@receiver(pre_delete, sender=Project, dispatch_uid='project_delete_all')
def delete_all_instances(sender, instance, using, **kwargs):
   instance.project_results_m2m.all().delete()

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