Django 1.8 tutorial-Chapter4: ValueError at /polls/1/vote/

[charito.romeo]

I am following the django 1.8 tutorial and I currently finished Part 4. My problem is when I tried to click on one of the radio buttons to vote, it gave me a ValueError below:

ValueError at /polls/1/vote/

invalid literal for int() with base 10: '{{      choice.id }}'

Request Method:	POST
Request URL:	http://127.0.0.1:8000/polls/1/vote/
Django Version:	1.8.1
Exception Type:	ValueError
Exception Value:	invalid literal for int() with base 10: '{{      choice.id }}'
Exception Location:	/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/fields/__init__.py in get_prep_value, line 985
Python Executable:	/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Python Version:	2.7.9
Python Path:	['/Users/cellbio1/Documents/django projects/mysite',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',  '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages',  '/Library/Python/2.7/site-packages']
Server time:	Thu, 14 May 2015 01:32:18 +0000

Traceback Switch to copy-and-paste view

• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/handlers/base.py in get_response

  132.                                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

       ...
  ▶ Local vars
• /Users/cellbio1/Documents/django projects/mysite/polls/views.py in vote

  31.                     selected_choice = p.choice_set.get(pk=request.POST['choice'])

      ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/manager.py in manager_method

  127.                             return getattr(self.get_queryset(), name)(*args, **kwargs)

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py in get

  325.                     clone = self.filter(*args, **kwargs)

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py in filter

  679.                     return self._filter_or_exclude(False, *args, **kwargs)

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/query.py in _filter_or_exclude

  697.                         clone.query.add_q(Q(*args, **kwargs))

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py in add_q

  1304.                     clause, require_inner = self._add_q(where_part, self.used_aliases)

        ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py in _add_q

  1331.                                 current_negated=current_negated, connector=connector, allow_joins=allow_joins)

        ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py in build_filter

  1203.                         condition = self.build_lookup(lookups, col, value)

        ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/sql/query.py in build_lookup

  1096.                             return final_lookup(lhs, rhs)

        ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/lookups.py in __init__

  96.                     self.rhs = self.get_prep_lookup()

      ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/lookups.py in get_prep_lookup

  134.                     return self.lhs.output_field.get_prep_lookup(self.lookup_name, self.rhs)

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/fields/__init__.py in get_prep_lookup

  727.                         return self.get_prep_value(value)

       ...
  ▶ Local vars
• /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/models/fields/__init__.py in get_prep_value

  985.                     return int(value)

       ...
  ▶ Local vars

Here's my polls/views.py:

def vote(request, question_id):

    p = get_object_or_404(Question, pk=question_id)

    try:

        selected_choice = p.choice_set.get(pk=request.POST['choice'])

    except (KeyError, Choice.DoesNotExist):

        #redisplay the question voting form.

        return render(request, 'polls/detail.html', {

            'question':p,

            'error_message':"You didn't select a choice",

        })

    else:

        selected_choice.votes += 1

        selected_choice.save()

        return HttpResponseRedirect(reverse('polls:results', args=(p.id,)))

Here's my polls/urls.py:

from django.conf.urls import url

from . import views

urlpatterns = [

    url(r'^$', views.IndexView.as_view(), name='index'),

    url(r'^(?P<pk>[0-9]+)/$', views.DetailView.as_view(), name='detail'),

    url(r'^(?P<pk>[0-9]+)/results/$',views.ResultsView.as_view(), name='results'),

    url(r'^(?P<question_id>[0-9]+)/vote/$', views.vote, name='vote'),

]

Here's my template/polls/detail.html:

<h1>{{ question.question_text }}</h1>

{% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}

<form action="{% url 'polls:vote' question.id %}" method="post">

{% csrf_token %}

{% for choice in question.choice_set.all %}

    <input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{

    choice.id }}"/>

    <label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br/>

{% endfor %}

<input type="submit" value="Vote"/>

</form>

Here's my template/polls/results.html:

<h2>{{ question.question_text }}</h2>

<ul>

    {% for choice in question.choice_set.all %}

        <li>{{ choice.choice_text }} -- {{ choice.votes }} vote{{ choice.votes|pluralize }}</li>

    {% endfor %}

</ul>

<a href="{% url 'polls:detail' question.id %}">Vote again?</a>

All the other pages work fine when run on the server except that my vote is not redirected to the updated results page. I appreciate if anyone could shed some light on this. Thanks a lot.

[Alasdair Nicol]

On 14/05/15 02:50, charito.romeo wrote:
> |
> <input type="radio" name="choice" id="choice{{ forloop.counter }}"
> value="{{
> choice.id }}"/>
> |

The problem is that there is a new line in the middle of

"{{ choice.id }}".

Change it to:

<input type="radio" name="choice" id="choice{{ forloop.counter }}"
value="{{ choice.id }}"/>

Cheers,
Alasdair

--
Alasdair Nicol
Developer, MEMSET

mail: alas...@memset.com
web: http://www.memset.com/

Memset Ltd., registration number 4504980.
Building 87, Dunsfold Park, Stovolds Hill, Cranleigh, Surrey, GU6 8TB, UK

[Charito Romeo]

Hi Alasdair,

Thanks a lot for the help. It's working now. Cheers :)

Charito

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