Hi,
model Choice is related to model Poll by ForeignKey. All Choice
objects related to specific Poll object can by returned by:
my_poll.choice_set.all()
And that is happening in the template in for loop:
{% for choice in poll.choice_set.all %}
...
More detailed info is here:
https://docs.djangoproject.com/en/1.4/topics/db/queries/#backwards-related-objects
Honza
On Fri, Oct 12, 2012 at 12:06 PM, Rick Chong <ulian...@gmail.com> wrote:
> Hi, I have just started learning programming and I am following the creating
> a poll app tutorial at:
> https://docs.djangoproject.com/en/1.4/intro/tutorial03/
>
> I hope that someone has attempted this tutorial and is able to help me on
> some very beginner questions:
>
> In this app, we defined 2 classes in the model - Poll & Choice:
>>>
>>> import datetime
>>>
>>> from django.utils import timezone
>>>
>>> from django.db import models
>>>
>>>
>>>
>>> # Create your models here.
>>>
>>> class Poll(models.Model):
>>>
>>> question = models.CharField(max_length=200)
>>>
>>> pub_date = models.DateTimeField('date published')
>>>
>>> def __unicode__(self):
>>>
>>> return self.question
>>>
>>> def was_published_recently(self):
>>>
>>> return self.pub_date >= timezone.now() - datetime.timedelta(days=1)
>>>
>>> was_published_recently.admin_order_field = 'pub_date'
>>>
>>> was_published_recently.boolean = True
>>>
>>> was_published_recently.short_description = 'Published recently?'
>>>
>>>
>>> class Choice(models.Model):
>>>
>>> poll = models.ForeignKey(Poll)
>>>
>>> choice = models.CharField(max_length=200)
>>>
>>> votes = models.IntegerField()
>>>
>>> def __unicode__(self):
>>>
>>> return self.choice
>
>
>
> Then in views.py... I have the following code:
>>>
>>> from django.shortcuts import render_to_response, get_object_or_404
>>>
>>> from polls.models import Poll
>>>
>>>
>>> def detail(request, poll_id):
>>>
>>> p = get_object_or_404(Poll, pk=poll_id)
>>>
>>> return render_to_response('polls/detail.html', {'poll': p})
>>
>>
>
>
> Then in my template, detail.html. I have the following code:
>>>
>>> <h1>{{ poll.question }}</h1>
>>>
>>> <ul>
>>>
>>> {% for choice in poll.choice_set.all %}
>>>
>>> <li>{{ choice.choice }}</li>
>>>
>>> {% endfor %}
>>>
>>> </ul>
>
>
>
>
> The scripts run My question:
> In views.py, I only import Poll class from model... why am I able to display
> choice, which is a variable under Choice class?
>
>
> Thank you very much.
>
>
>
>
> Rick
>
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