adds a view for voting on a question

polls/models.py

@@ -19,4 +19,4 @@ class Choice(models.Model):
     votes = models.IntegerField(default=0)
 
     def __str__(self):
-        return self.choice_text
+        return self.choice_text

polls/templates/polls/details.html

@@ -1,9 +1,12 @@
-<h3>Question:</h3>
-<p>{{ question.question_text }}</p>
-
-<h3>Available Choices:</h3>
-<ul>
+<form action="{% url 'polls:vote' question.id %}" method="post">
+{% csrf_token %}
+<fieldset>
+    <legend><h1>{{ question.question_text }}</h1></legend>
+    {% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
     {% for choice in question.choice_set.all %}
-        <li>{{ choice.choice_text }}</li>
+        <input type="radio" name="choice" id="choice{{ forloop.counter }}" value="{{ choice.id }}">
+        <label for="choice{{ forloop.counter }}">{{ choice.choice_text }}</label><br>
     {% endfor %}
-</ul>
+</fieldset>
+<input type="submit" value="Vote">
+</form>

polls/urls.py

@@ -2,6 +2,8 @@ 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/views.py

@@ -1,6 +1,7 @@
-from django.http import HttpResponse, Http404
+from django.http import HttpResponse, Http404, HttpResponseRedirect
 from django.template import loader 
-from django.shortcuts import render
+from django.shortcuts import render, get_object_or_404
+from django.urls import reverse
 
 from .models import Question, Choice
 
@@ -24,4 +25,16 @@ def results(request, question_id):
     return HttpResponse(response % question_id)
 
 def vote(request, question_id):
-    return HttpResponse("you are voting on question %s" % 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):
+        return render(request, "polls/details.html", {
+            "question": question,
+            "error_message": "You didn't select a choice!"
+        })
+    else:
+        selected_choice.votes += 1
+        selected_choice.save()
+
+        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))