Question

I am trying to show the 8 most recent scans added by doing this:

def index(request):
....
recent_scans = Image.objects.filter(category='Scan').order_by('-date_added')[:8]
...

It “works,” but it is not literally getting the 8 most recent scans. The order is different compared to the order for the def scans. The order is not completely different, it’s just that there a few scans misplaced.

What is weird is that it works in this view:

def scans(request):
    image_list = Image.objects.filter(category='Scan').order_by('-date_added')

Taking out the [:8] to see if it’ll sort correctly does NOT work, though…so I don’t know what it wrong. My only guess is that the Image model is connected through a ManytoMany…

I’ve also tried this:

recent_scans = Image.objects.filter(category='Scan').latest('date_added')

But it comes with this error:

Caught TypeError while rendering: ‘Image’ object is not iterable

Here is my model, btw:

class Image(models.Model):
    CATEGORY_CHOICES = (
    ('Cover', 'Cover'),    
    ('Scan', 'Scan'),
    ('Other', 'Other'),
    )
    title = models.CharField(max_length=128)
    image = models.ImageField(upload_to="images/")
    category = models.CharField(max_length=10, choices=CATEGORY_CHOICES)
    contributor = models.ManyToManyField(Contributor, blank=True, null=True)
    date_added = models.DateField(auto_now_add=True)    
    def __unicode__(self):
        return self.title        
    class Meta:
        ordering = ['title']

I’ve tried adding ‘get_latest_by = “date_added”` to the Meta class in my models, but that did not work either.

Answer 1

I do not know why it doesn’t correctly order by date_added even though in my Issue model, it does. My only guess is that the database doesn’t correctly order by the latest item if it’s a DateField and not a DateTimeField. Weird, because, again, the Issue model does the same.

So, I’ve simply just worked around it by sorting by the id and it works great!