I have a model like this

class Category(models.Model):
    title = models.CharField(max_length=100, db_index=True)
    slug = models.SlugField(max_length=100, db_index=True)

    def __str__(self):
        return "%s"%self.title
class Video(models.Model):
    title = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=100, unique=True)
    idlink = models.CharField(max_length=50)
    posted = models.DateField(db_index=True, auto_now_add=True)
    category = models.ForeignKey(Category)

    def __str__(self):
        return "%s"%self.title

And my views.py is

def list_video_cat(request, slug):
    video = Video.objects.filter(category__slug=slug).order_by('-posted')
    return  render(request, 'category.html', {'videos':video})

I want to show my post new to old, but it seems to did not work at this 
situation. What should I do?


*P/S I read this topic before, but it does not solve my 
problem 
http://stackoverflow.com/questions/6114718/order-by-doesnt-work-with-filter-in-django-view*

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