I believe this is how the code is supposed to function. When you visit the
index page the list should show the most recently posted/edited poll
question.
For example:
Lets say we have 3 questions
Question 1, published - 1 / 19 / 2017 - morning
Question 2, published - 1 / 19 / 2017 - night
Question 3, published - 1 / 20 / 2017
When we call Question.objects.all() is passes the published date of each
question model and lists them in ascending order.
This means that the most recently edited or posted question will be on the
bottom of the list and our list would like something like so:
Question 3, Question, 2, Question 1
Now by adding '-' this tell django that we want to index our list in
reverse order. Since everything is stored in ascending order as it is
created, it is easy to look up things in descending order by reversing our
list.
In this case the list isn't literally reversed merely indexed from the end
of the list to the beginning.
So with that said if we call Question.objects.all('-pub_date') it will
return to us our list in reverse order
Question 1, Question 2, Question 3.
( The 5 within the brackets will return everything before the 5th index,
index 0-4.)
Okay now with all that in mind I would recommend that you check out the
polls admin page. On the Questions page i would delete all of the Questions
that have already been created and i would recommend creating at least 6
questions either manually
or using a script to create a dummy database. Make sure that the pub date
for each question is one day apart.
Then in your polls.views under latest_question_list add
oldest_to_newest = Question.objects.all('pub_date')[:5]
make sure to include oldest_to_newest in the context dictionary ( context
{ 'item1': item1, 'item2': item2, }
With that complete edit index.html to look like so.
polls/templates/polls/index.html
{% if latest_question_list %}
<ul>
{% for question in latest_question_list %}
<li><a href="/polls/{{ question.id }}/">{{ question.question_text
}}</a></li>
{% endfor %}
</ul>
{% else %}
<p>No polls are available.</p>
{% endif %}
<br />
{% if oldest_to_newest %}
<ul>
{% for question in oldest_to_newest %}
<li><a href="/polls/{{ question.id }}/">{{ question.question_text }}
</a></li>
{% endfor %}
</ul>
{% else %}
<p>No polls are available.</p>
{% endif %}
Now when you go to /polls you should see two lists the first in descending
order and the second in ascending order and if you open your admin page in
a new tab you can check the pub date of your Questions and compare that
information to
what is being rendered so that you can more easily see what django is
doing.
Bottom line i believe there was a bit of a misunderstanding as to how the
list would be rendered, between what you imagined it should look like and
what the django tutorial explains will be rendered. Hopefully this will
help you better understand whats going on
a bit better. I myself have gotten stuck on some parts of the tutorial and
found that I've usually misread or misunderstood something in my haste or
have created a bug while trying to type fast.
Again hope this help,
Victor
P.s. If the official tutorial leaves you with some questions and you need
more information to feel confident while developing with django, I would
recommend checking out tango with django and even django girls, they are
both very indepth, and are focused on
building a website ready to publish from start to finish to help better
understand the entire process of web-development and how django makes it
easier to develop websites. Also spending time finding other django
applications and learning how to use them with
your projects, for example bootstraps3, sekizai, and django-cms are a few
applications you can install and include in your projects to help with the
development process.
On Thursday, January 19, 2017 at 2:21:32 PM UTC-5, DjangoUserDM wrote:
>
> I have a question about the "Polls" app, as described in the Django
> Beginners' Tutorial, https://docs.djangoproject.com/en/1.10/intro/. In
> tutorial 3, the index view contains the following code:
>
>
>
> latest_question_list = Question.objects.order_by('-pub_date')[:5]
>
>
>
> It is stated that this produces the latest 5 questions according to
> publication date. The '-' in front of 'pub_date' is intended to return the
> questions in descending rather than ascending order of publication date.
> Yet when I tried this out, it returns the *earliest* 5 questions in my
> database. Is this an error, or (more likely), have I done something wrong?
>
> Thanks for any advice!
>
>
>
> David
>
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