Re: PLEASE HELP! Django documentation, Writing Your First App, Part 4

On Sunday, February 3, 2019 at 10:22:56 AM UTC-5, Atsunori Kaneshige wrote:

Hi Nitin,

Thank you for your comment.

I did 

jango-admin startproject mysite

and cd mysite, then

python manage.py runserver

and server is working, so I did

opython manage.py startapp polls

polls app was successfully created, and stopped the server because I wanted to user postgresql instead of the default SQLite3(?).

I did below

pg_ctl -D /user/local/var/posgres start

postgres successfully started running, then stopped

By the way, I registered polls app in settings.py (I just copied and pasted part of codes from the file below)

INSTALLED_APPS = [

    'polls.apps.PollsConfig',

Also, I followed the way to add postgres as database, I looked as Django docs

DATABASES = {

    'default': {

        'ENGINE': 'django.db.backends.postgresql',

        'NAME': 'Koitaro',

        'USER': '',

        'PASSWORD': '',

        'HOST': '',

        'PORT': '',

    }

}

I did migration too, like migrate, makemigration etc, just copied and pasted from Django Docs

This is my models.py

import datetime

from django.db import models

from django.utils import timezone

# Create your models here.

class Question(models.Model):

    question_text = models.CharField(max_length=200)

    pub_date = models.DateTimeField('date published')

    def __str__(self):

        return self.question_text

    def was_published_recently(self):

        return self.pub_date >= timezone.now() - datetime.timedelta(days=1)

class Choice(models.Model):

    question = models.ForeignKey(Question, on_delete=models.CASCADE)

    choice_text = models.CharField(max_length=200)

    votes = models.IntegerField(default=0)

    def __str__(self):

        return self.choice_text

mygration was successfully generated

from django.db import migrations, models

import django.db.models.deletion

class Migration(migrations.Migration):

    initial = True

    dependencies = [

    ]

    operations = [

        migrations.CreateModel(

            name='Choice',

            fields=[

                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),

                ('choice_text', models.CharField(max_length=200)),

                ('votes', models.IntegerField(default=0)),

            ],

        ),

        migrations.CreateModel(

            name='Question',

            fields=[

                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),

                ('question_text', models.CharField(max_length=200)),

                ('pub_date', models.DateTimeField(verbose_name='date published')),

            ],

        ),

        migrations.AddField(

            model_name='choice',

            name='question',

            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='polls.Question'),

        ),

    ]

When I go to admin, I added 5 or 6 questions, and successfully added in database.

the database name I made is 'Koitaro'.

I registered in settings.py and I have this database named as Koitaro in my posgresql

question has data, but choice thing doesn't seem having any data...

I really appreciate your thoughts.

Nori

On Sunday, February 3, 2019 at 1:56:18 AM UTC-5, Nitin Kalmaste wrote:

Have you migrated database and added any question there?

On Sun, Feb 3, 2019, 8:39 AM Atsunori Kaneshige <atsu...@umich.edu wrote:

Oh, one note is that I am using postgresql.

everything else except vote function in views.py seems working.

Sorry, any help would be really appreciated!

Nori

On Saturday, February 2, 2019 at 10:02:14 PM UTC-5, Atsunori Kaneshige wrote:

Hi Django users,

I started using Django recently.

I am following the official Django tutorial.

I am just at Writing Your First Django App, Part4, and I have been just copying and pasting all codes.

But I have a problem in vote.

I inserted print(question) and this is printed in detail.html

also, question.id is also printed.

BUT, choice part doesn't seem working.

<THIS IS views.py>

def vote(request, question_id):

    question = get_object_or_404(Question, pk=question_id)

    print(question)

    try:

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

    except (KeyError, Choice.DoesNotExist) as e:

        # Redisplay the question voting form.

        print(e)

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

            'question': question,

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

        })

    else:

        selected_choice.votes += 1

        selected_choice.save()

        # Always return an HttpResponseRedirect after successfully dealing

        # with POST data. This prevents data from being posted twice if a

        # user hits the Back button.

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

<THIS IS details.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>

<br>

{{ question }}

#printed 

 <br>

{{ question.id }}

#printed

<br>

{{ question.choice_set.all }}

#<QuerySet []> #what is this? empty? why?

<br>

{{ question.question_text }}

#printed

<br>

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

#printed

<ul>

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

    <li>{{ choice.choice_text }}</li>

{% endfor %}

#nothing printed!

</ul>

Also when I click button 'vote', I only get error.

You didn't select a choice.

I am just copying and pasting so that I can understand Django, but I am having hard time in this Part 4.

I really appreciate advice from anybody!

Nori

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