Writing your first Django app, part 3

mdamien · Sep 4, 2016 · eb36751 · eb36751
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Showing 6 changed files with 80 additions and 4 deletions.
diff --git a/polls/models.py b/polls/models.py
@@ -1,4 +1,7 @@
+import datetime
+
 from django.db import models
+from django.utils import timezone
 
 
 class Question(models.Model):

diff --git a/polls/templates/polls/detail.html b/polls/templates/polls/detail.html
@@ -0,0 +1,12 @@
+<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>
diff --git a/polls/templates/polls/index.html b/polls/templates/polls/index.html
@@ -0,0 +1,9 @@
+{% 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 %}
diff --git a/polls/templates/polls/results.html b/polls/templates/polls/results.html
@@ -0,0 +1,9 @@
+<h1>{{ question.question_text }}</h1>
+
+<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>
diff --git a/polls/urls.py b/polls/urls.py
@@ -2,6 +2,10 @@
 
 from . import views
 
+app_name = 'polls'
 urlpatterns = [
-    url(r'^$', views.index, name='index'),
+    url(r'^$', 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'),
 ]
diff --git a/polls/views.py b/polls/views.py
@@ -1,5 +1,44 @@
-from django.http import HttpResponse
+from django.shortcuts import get_object_or_404, render
+from django.http import HttpResponseRedirect
+from django.urls import reverse
+from django.views import generic
 
+from .models import Choice, Question
 
-def index(request):
-    return HttpResponse("Hello, world. You're at the polls index.")
+
+class IndexView(generic.ListView):
+    template_name = 'polls/index.html'
+    context_object_name = 'latest_question_list'
+
+    def get_queryset(self):
+        """Return the last five published questions."""
+        return Question.objects.order_by('-pub_date')[:5]
+
+
+class DetailView(generic.DetailView):
+    model = Question
+    template_name = 'polls/detail.html'
+
+
+class ResultsView(generic.DetailView):
+    model = Question
+    template_name = 'polls/results.html'
+
+
+def vote(request, question_id):
+    question = get_object_or_404(Question, pk=question_id)
+    try:
+        selected_choice = question.choice_set.get(pk=request.POST['choice'])
+    except (KeyError, Choice.DoesNotExist):
+        # Redisplay the question voting form.
+        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,)))