Django视图/模型属性错误

Question

I'm new to Django and I'm in the process of converting a PHP project into Python etc.

I'm trying to do something super simple, but I keep getting the following error:

AttributeError at /news/1/
'QuerySet' object has no attribute 'slug'

Here is my most of my Model to help explain:

class Article(models.Model):    
    title            = models.CharField(max_length=200)
    STATUS_CHOICES   = ((1,'Published'), (2,'Hidden'), (3,'Draft'))
    status           = models.IntegerField(choices=STATUS_CHOICES,default=3)
    pub_date         = models.DateField('date published')
    tags             = TaggableManager()
    header_width     = models.IntegerField(default=1,blank=True,null=True)
    header_height    = models.IntegerField(default=1,blank=True,null=True)
    header           = models.ImageField(upload_to='news/',width_field='header_width',height_field='header_height',blank=True,null=True)
    header_filter    = models.BooleanField('Enable filter',default=1)
    excerpt          = HTMLField(blank=True)
    body             = HTMLField(blank=True)
    custom_link_text = models.CharField(max_length=20,default="Read More")
    created_at       = models.DateTimeField(auto_now_add=True)
    updated_at       = models.DateTimeField(auto_now=True)
    slug             = AutoSlugField(unique=True,max_length=200,populate_from='db_slug',default="",slugify=return_value)

    def __str__(self):
        return self.title

Im currently just testing to pull through the slug, so my view method currently looks like this:

def detail_redirect(request, pk):   
    a = Article.objects.all().filter(pk=pk)
    return HttpResponse(a.slug)
    # return redirect('news:detail',args=(a.slug,pk))

The plan is for this method to redirect to another URL in my application. It queries the DB via the primary key and fetches the Slug, which I then pass on to the redirect shortcut.

It seems to be something that should just work, but it's not. It's really frustrating. The object i query appears to return ok. Because of my __str__ method it returns the title. But any other attributes throw and error. Could it be todo with visibility such as being private or protected?

I'm hoping it's something simple I'm missing. Let me know if you require more code/detail to help explain.

Thanks for taking the time to look at my question.

Answer 1

filter always returns a queryset, which is a list-like object potentially consisting of many items. Querysets do not have model attributes, only their members do. You should use get instead:

a = Article.objects.get(pk=pk)

(Note you don't need all() , in either version of the code.)