Writing your first Django app, part 3

References:

• Django Getting started, part 3
• Django Grils Tutorial, STATIC_ROOT
• Django , Django import / export

Hosting:

• Read The Docs, part 3

3-1. Polls Index

Lab:

*** edit polls/views.py
*** add polls/templates/polls/index.html

• polls/views.py:

  from django.shortcuts import render
  from .models import Question
  
  def index(request):
      latest_question_list = Question.objects.order_by('-pub_date')[:5]
      context = {'latest_question_list': latest_question_list}
      return render(request, 'polls/index.html', context)
  

• 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 %}
  

Note

Show questions on our polls page.

3-2. Polls Detail

Lab:

*** edit polls/urls.py
*** edit polls/models.py
*** edit polls/views.py
*** edit polls/templates/polls/index.html
*** add polls/templates/polls/detail.html
. go

• polls/urls.py:

  from django.urls import path
  from . import views
  app_name = 'polls'
  
  urlpatterns = [
    path('', views.index, name='index'),
    path('<int:question_id>/', views.detail, name='detail')
  ]
  

• polls/models.py:

  from django.db import models
  
  class Question(models.Model):
      question_text = models.CharField(max_length=200)
      pub_date = models.DateTimeField('date published')
      def __str__(self):
          return self.question_text
  
  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.question.question_text+" "+self.choice_text
  

• polls/views.py:

  from django.shortcuts import render,get_object_or_404
  from .models import Question
  
  def index(request):
      latest_question_list = Question.objects.order_by('-pub_date')[:5]
      context = {'latest_question_list': latest_question_list}
      return render(request, 'polls/index.html', context)
  
  def detail(request, question_id):
      question = get_object_or_404(Question, pk=question_id)
      return render(request, 'polls/detail.html', {'question': question})
  

• polls/templates/polls/index.html:

  {% if latest_question_list %}
    <ul>
    {% for question in latest_question_list %}
      <li><a href="{% url 'polls:detail' question.id %}">{{ question.question_text }}</a></li>
    {% endfor %}
    </ul>
  {% else %}
    <p>No polls are available.</p>
  {% endif %}
  

• polls/templates/polls/detail.html:

  <h1>{{ question.question_text }}</h1>
  <ul>
  {% for choice in question.choice_set.all %}
      <li>{{ choice.choice_text }}</li>
  {% endfor %}
  </ul>
  

3-3. Django import / export

Lab:

pip install django-import-export
pip freeze
*** edit mysite/setting.py
*** edit polls/admin.py
. go

• mysite/setting.py:

  INSTALLED_APPS = (
    'import_export',
    'polls',
    ...
  
  ...
  STATIC_URL = '/static/'
  # https://tutorial.djangogirls.org/en/django_start_project/
  STATIC_ROOT = os.path.join(BASE_DIR, 'static')
  

• polls/admin.py:

  from django.contrib import admin
  
  from import_export import resources
  from import_export.admin import ImportExportModelAdmin
  
  from .models import Question,Choice
  
  
  class QuestionResource(resources.ModelResource):
      class Meta:
          model = Question
  
  class QuestionAdmin(ImportExportModelAdmin):
      resource_class = QuestionResource
  
  admin.site.register(Question,QuestionAdmin)
  
  class ChoiceResource(resources.ModelResource):
      class Meta:
          model = Choice
  
  class ChoiceAdmin(ImportExportModelAdmin):
      resource_class = ChoiceResource
  
  admin.site.register(Choice,ChoiceAdmin)