CODEWITHSUNDEEP
djangodjango-modelsdjango-rest-frameworkdjango-formsdjango-templates
Arbazz Hussain
Arbazz Hussain

Reputation: 1932

Django delete all M2M related objects on main object delete

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()

Now I would like to delete all objects of Project_Results related to project_results_m2m for Project object 1.

How do I achieve it in a safe manner while deleting, either with signals or without signals?

Upvotes: 0

Views: 669

Answers (1)

ruddra
ruddra

Reputation: 51978

Probably you need to use pre_delete signal:

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()

Upvotes: 2

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