Fixed django#18353 -- Inconsistency in date-based CBVs.

django/views/generic/dates.py

@@ -37,6 +37,18 @@ def get_year(self):
                     raise Http404(_(u"No year specified"))
         return year
 
+    def get_next_year(self, date):
+        """
+        Get the next valid year.
+        """
+        return _get_next_prev(self, date, is_previous=False, period='year')
+
+    def get_previous_year(self, date):
+        """
+        Get the previous valid year.
+        """
+        return _get_next_prev(self, date, is_previous=True, period='year')
+
     def _get_next_year(self, date):
         """
         Return the start date of the next interval.
@@ -419,7 +431,11 @@ def get_dated_items(self):
             # to find information about the model.
             qs = qs.none()
 
-        return (date_list, qs, {'year': year})
+        return (date_list, qs, {
+            'year': date,
+            'next_year': self.get_next_year(date),
+            'previous_year': self.get_previous_year(date),
+        })
 
     def get_make_object_list(self):
         """

docs/ref/class-based-views.txt

@@ -1171,7 +1171,15 @@ YearArchiveView
       have objects available according to ``queryset``, represented as
       ``datetime.datetime`` objects, in ascending order.
 
-    * ``year``: The given year, as a four-character string.
+    * ``year``: A ``datetime.date`` object representing the given year.
+
+    * ``next_year``: A ``datetime.date`` object representing the first day
+      of the next year. If the next year is in the future, this will be
+      ``None``.
+
+    * ``previous_year``: A ``datetime.date`` object representing the first
+      day of the previous year. Unlike ``next_year``, this will never be
+      ``None``.
 
     **Notes**
 

docs/releases/1.5.txt

@@ -71,6 +71,18 @@ Backwards incompatible changes in 1.5
     deprecation timeline for a given feature, its removal may appear as a
     backwards incompatible change.
 
+Context in year archive class-based views
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+For consistency with the other date-based generic views,
+:class:`~django.views.generic.dates.YearArchiveView` now passes ``year`` in
+the context as a :class:`datetime.date` rather than a string.  If you are
+using ``{{ year }}`` in your templates, you must replace it with ``{{
+year|date:"Y" }}``.
+
+``next_year`` and ``previous_year`` were also added in the context. They are
+calculated according to ``allow_empty`` and ``allow_future``.
+
 Features deprecated in 1.5
 ==========================
 
@@ -86,4 +98,4 @@ our own copy of ``simplejson``. You can safely change any use of
 ~~~~~~~~~~~~~~~~~~~~~~
 
 The :func:`~django.utils.itercompat.product` function has been deprecated. Use
-the built-in `itertools.product` instead.
+the built-in :func:`itertools.product` instead.

tests/regressiontests/generic_views/dates.py

@@ -115,9 +115,13 @@ def test_year_view(self):
         res = self.client.get('/dates/books/2008/')
         self.assertEqual(res.status_code, 200)
         self.assertEqual(list(res.context['date_list']), [datetime.datetime(2008, 10, 1)])
-        self.assertEqual(res.context['year'], '2008')
+        self.assertEqual(res.context['year'], datetime.date(2008, 1, 1))
         self.assertTemplateUsed(res, 'generic_views/book_archive_year.html')
 
+        # Since allow_empty=False, next/prev years must be valid (#7164)
+        self.assertEqual(res.context['next_year'], None)
+        self.assertEqual(res.context['previous_year'], datetime.date(2006, 1, 1))
+
     def test_year_view_make_object_list(self):
         res = self.client.get('/dates/books/2006/make_object_list/')
         self.assertEqual(res.status_code, 200)
@@ -134,6 +138,10 @@ def test_year_view_empty(self):
         self.assertEqual(list(res.context['date_list']), [])
         self.assertEqual(list(res.context['book_list']), [])
 
+        # Since allow_empty=True, next/prev are allowed to be empty years (#7164)
+        self.assertEqual(res.context['next_year'], datetime.date(2000, 1, 1))
+        self.assertEqual(res.context['previous_year'], datetime.date(1998, 1, 1))
+
     def test_year_view_allow_future(self):
         # Create a new book in the future
         year = datetime.date.today().year + 1
@@ -162,7 +170,7 @@ def test_year_view_invalid_pattern(self):
 
     def test_no_duplicate_query(self):
         # Regression test for #18354
-        with self.assertNumQueries(2):
+        with self.assertNumQueries(4):
             self.client.get('/dates/books/2008/reverse/')
 
     def test_datetime_year_view(self):