django tutorial part 5

polls/models.py

@@ -16,4 +16,8 @@ class Choice(models.Model):
     choice_text = models.CharField(max_length=200)
     votes = models.IntegerField(default=0)
     def __str__(self):
-        return self.choice_text
+        return self.choice_text
+    
+def was_published_recently(self):
+    now = timezone.now()
+    return now - datetime.timedelta(days=1) <= self.pub_date <= now

polls/tests.py

@@ -1,3 +1,124 @@
+import datetime
 from django.test import TestCase
+from django.utils import timezone
+from django.urls import reverse
 
-# Create your tests here.
+from .models import Question
+
+
+class QuestionModelTests(TestCase):
+    def test_was_published_recently_with_future_question(self):
+        """
+        was_published_recently() returns False for questions whose pub_date
+        is in the future.
+        """
+        time = timezone.now() + datetime.timedelta(days=30)
+        future_question = Question(pub_date=time)
+        self.assertIs(future_question.was_published_recently(), False)
+
+def test_was_published_recently_with_old_question(self):
+    """
+    was_published_recently() returns False for questions whose pub_date
+    is older than 1 day.
+    """
+    time = timezone.now() - datetime.timedelta(days=1, seconds=1)
+    old_question = Question(pub_date=time)
+    self.assertIs(old_question.was_published_recently(), False)
+
+
+def test_was_published_recently_with_recent_question(self):
+    """
+    was_published_recently() returns True for questions whose pub_date
+    is within the last day.
+    """
+    time = timezone.now() - datetime.timedelta(hours=23, minutes=59, seconds=59)
+    recent_question = Question(pub_date=time)
+    self.assertIs(recent_question.was_published_recently(), True)
+
+def create_question(question_text, days):
+    """
+    Create a question with the given `question_text` and published the
+    given number of `days` offset to now (negative for questions published
+    in the past, positive for questions that have yet to be published).
+    """
+    time = timezone.now() + datetime.timedelta(days=days)
+    return Question.objects.create(question_text=question_text, pub_date=time)
+
+
+class QuestionIndexViewTests(TestCase):
+    def test_no_questions(self):
+        """
+        If no questions exist, an appropriate message is displayed.
+        """
+        response = self.client.get(reverse("polls:index"))
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "No polls are available.")
+        self.assertQuerySetEqual(response.context["latest_question_list"], [])
+
+    def test_past_question(self):
+        """
+        Questions with a pub_date in the past are displayed on the
+        index page.
+        """
+        question = create_question(question_text="Past question.", days=-30)
+        response = self.client.get(reverse("polls:index"))
+        self.assertQuerySetEqual(
+            response.context["latest_question_list"],
+            [question],
+        )
+
+    def test_future_question(self):
+        """
+        Questions with a pub_date in the future aren't displayed on
+        the index page.
+        """
+        create_question(question_text="Future question.", days=30)
+        response = self.client.get(reverse("polls:index"))
+        self.assertContains(response, "No polls are available.")
+        self.assertQuerySetEqual(response.context["latest_question_list"], [])
+
+    def test_future_question_and_past_question(self):
+        """
+        Even if both past and future questions exist, only past questions
+        are displayed.
+        """
+        question = create_question(question_text="Past question.", days=-30)
+        create_question(question_text="Future question.", days=30)
+        response = self.client.get(reverse("polls:index"))
+        self.assertQuerySetEqual(
+            response.context["latest_question_list"],
+            [question],
+        )
+
+    def test_two_past_questions(self):
+        """
+        The questions index page may display multiple questions.
+        """
+        question1 = create_question(question_text="Past question 1.", days=-30)
+        question2 = create_question(question_text="Past question 2.", days=-5)
+        response = self.client.get(reverse("polls:index"))
+        self.assertQuerySetEqual(
+            response.context["latest_question_list"],
+            [question2, question1],
+        )
+
+class QuestionDetailViewTests(TestCase):
+    def test_future_question(self):
+        """
+        The detail view of a question with a pub_date in the future
+        returns a 404 not found.
+        """
+        future_question = create_question(question_text="Future question.", days=5)
+        url = reverse("polls:detail", args=(future_question.id,))
+        response = self.client.get(url)
+        self.assertEqual(response.status_code, 404)
+
+    def test_past_question(self):
+        """
+        The detail view of a question with a pub_date in the past
+        displays the question's text.
+        """
+        past_question = create_question(question_text="Past Question.", days=-5)
+        url = reverse("polls:detail", args=(past_question.id,))
+        response = self.client.get(url)
+        self.assertContains(response, past_question.question_text)

polls/views.py

@@ -3,9 +3,17 @@ from django.http import HttpResponseRedirect
 from django.shortcuts import get_object_or_404, render
 from django.urls import reverse
 from django.views import generic
-
+from django.utils import timezone
 from .models import Choice, Question
 
+def get_queryset(self):
+    """
+    Return the last five published questions (not including those set to be
+    published in the future).
+    """
+    return Question.objects.filter(pub_date__lte=timezone.now()).order_by("-pub_date")[
+        :5
+    ]
 
 class IndexView(generic.ListView):
     template_name = "polls/index.html"
@@ -19,6 +27,12 @@ class IndexView(generic.ListView):
 class DetailView(generic.DetailView):
     model = Question
     template_name = "polls/detail.html"
+    
+    def get_queryset(self):
+        """
+        Excludes any questions that aren't published yet.
+        """
+        return Question.objects.filter(pub_date__lte=timezone.now())
 
 
 class ResultsView(generic.DetailView):