Generic UpdateView isn't working with slug - django

Question

I'm pretty new to django.I am trying to update a post with generic UpdateView. But the post isn't updating after filling up the form.Im accessing the update view through slug url.
My model:
class Post(models.Model):
title = models.CharField(max_length=60)
post_body = models.TextField()
time_posted = models.DateTimeField(default=timezone.now)
author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete= models.CASCADE)
slug = models.SlugField(null=False,unique=True)
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse('postdetail', kwargs={'slug': self.slug})
def save(self,*args,**kwargs):
if not self.slug:
author_id = str(self.author.id)
self.slug = slugify(self.title +'-'+author_id)
return super().save(*args, **kwargs)
My view:
class postupdate(LoginRequiredMixin,UserPassesTestMixin,UpdateView):
model = Post
fields = ['title','post_body']
def form_valid(self, form):
form.instance.author = self.request.user
return super().form_valid(form)
def test_func(self):
post = self.get_object()
if self.request.user == post.author:
return True
else:
return False
My url:
path('post/<slug:slug>/updatepost/', postupdate.as_view(),name = 'updatepost'),

Answer 1

It seems the save() method is not getting called every time.
class Post(models.Model):
# rest of your code
def save(self, *args, **kwargs):
if not self.slug:
author_id = str(self.author.id)
self.slug = slugify(self.title + '-' + author_id)
return super().save(*args, **kwargs) # outside the `if...` clause