Please give this a try: https://github.com/django/django/pull/6524
On Wednesday, April 27, 2016 at 10:45:03 AM UTC-4, Ankush Thakur wrote: > > I'm not sure how Book.objects.first().chapters is different > from Book.objects.first().chapters.count(), but the point is that > "chapters" is not defined in the models at the top of that page! The > snippet makes sense if I treat Book.chapters as another ManyToManyField > (like authors), but it's really weird to see that error in the docs. So, > does that mean I can report it? If yes, to who? > > On Wednesday, April 27, 2016 at 4:36:40 AM UTC+5:30, Tim Graham wrote: >> >> Looks like a typo. Does the rest of the example make sense and work if >> that line is changed to "Book.objects.first().chapters"? >> >> On Tuesday, April 26, 2016 at 12:50:31 PM UTC-4, Ankush Thakur wrote: >>> >>> Folks, I'm having exceptional trouble understanding annotate(), >>> aggregate(), and their various combinations. I'm currently stuck here: >>> https://docs.djangoproject.com/en/1.9/topics/db/aggregation/#combining-multiple-aggregations >>> >>> The example here uses Book.objects.first().chapters.count(), but there's >>> no chapters model or field at the start of the tutorial. It's frustrating, >>> to say the least. Even if I set up a separate application to test this >>> myself, what do I make of "chapters"? Is it another model with many-to-many >>> relation with Book? When I ran an example with the following models: >>> >>> class Author(models.Model): >>> name = models.CharField(max_length=100) >>> age = models.IntegerField() >>> >>> class Book(models.Model): >>> name = models.CharField(max_length=300) >>> chapters = models.IntegerField() >>> authors = models.ManyToManyField(Author) >>> >>> I got: >>> >>> >>> Book.objects.first().chapters.count() >>> Traceback (most recent call last): >>> File "<console>", line 1, in <module> >>> AttributeError: 'int' object has no attribute 'count' >>> >>> >>> >>> So basically, I feel like I'm screwed. Please help. >>> >> -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/7239e49a-1b5c-4a2a-9e50-d7e6ecfb7cd2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
