Django M2M save and add relationship for each relative

Question

i have one silly problem with Django M2M saving. I don't use Django Admin (use my own custom templates)

So, I have simple relationship:

# models
class News(models.Model):
    title = models.CharField(max_length=256)

class Webmaster(AbstractUser):
    ...
    news = models.ManyToManyField(News)

I need after saving every news mark it as new to every webmaster. So i figure out something like this:

# models
class News(models.Model):
    title = models.CharField(max_length=256)

    def save(self, *args, **kwargs):
        if self.id:
            news = News.objects.all()[0]
            self.webmasters.add(news)
        super(News, self).save(*args, **kwargs)

But i try like 6-7 different ways, and my code still don't work, can you help? Thanks!

Answer 1

You have to use post_save () signal, add this code in models.py

def Webmaster_add(sender, instance, **kwargs):
     #you can put here some condition stuff
     w = Webmasters.objects.all()
     for obj in w:
         obj.news.add(instance)

# register the signal
post_save.connect(webmaster_add, sender=News)