(SIO-1832) Add button for invalidating ranking

It lets admin manually control the ranking and invalidate it in case
something goes wrong during the constest.

Change-Id: I0b5ef6cffb70b0e66c4c17d81d7af7c83f0bef7d

oioioi/rankings/templates/rankings/ranking_view.html

@@ -13,6 +13,10 @@
                 <span class="glyphicon glyphicon-download"></span>
                 {% trans "Export to CSV" %}
             </a>
+            <a role="button" class="btn btn-sm btn-default"
+                href="#" data-post-url="{% url 'ranking_invalidate' contest_id=contest.id key=key %}">
+                {% trans "Regenerate ranking" %}
+            </a>
         {% endif %}
         {% if form and user.is_authenticated and not is_admin %}
             <a role="button" class="btn btn-sm btn-default"

oioioi/rankings/tests.py

@@ -148,6 +148,7 @@ def test_ranking_view(self):
         with fake_time(datetime(2015, 8, 5, tzinfo=utc)):
             response = self.client.get(url)
             self.assertContains(response, 'Export to CSV')
+            self.assertContains(response, 'Regenerate ranking')
 
         # Check that Admin is filtered out.
         self.client.login(username='test_user')
@@ -157,6 +158,7 @@ def test_ranking_view(self):
             self.assertFalse(re.search(USER_CELL_PATTERN % ('Test Admin',),
                                        response.content))
             self.assertNotContains(response, 'Export to CSV')
+            self.assertNotContains(response, 'Regenerate ranking')
 
         # Ok, so now we make test_admin a regular user.
         admin = User.objects.get(username='test_admin')
@@ -244,6 +246,29 @@ def test_ranking_csv_view(self):
             for task in ['zad2', 'zad3', 'zad3']:
                 self.assertNotContains(response, task)
 
+    def test_invalidate_view(self):
+        contest = Contest.objects.get()
+        url = reverse('ranking_invalidate', kwargs={'contest_id': contest.id,
+                                            'key': 'key'})
+
+        self.assertTrue(self.client.login(username='test_user'))
+        with fake_time(datetime(2019, 1, 27, tzinfo=utc)):
+            check_not_accessible(self, url)
+
+        self.assertTrue(self.client.login(username='test_admin'))
+        with fake_time(datetime(2019, 1, 27, tzinfo=utc)):
+            ranking, _ = Ranking.objects.get_or_create(contest=contest,
+                key='admin#key', needs_recalculation=False)
+            ranking.save()
+            self.assertTrue(ranking.is_up_to_date())
+            recalc = choose_for_recalculation()
+            self.assertIsNone(recalc)
+            response = self.client.post(url, key='key')
+            ranking.refresh_from_db()
+            self.assertFalse(ranking.is_up_to_date())
+            recalc = choose_for_recalculation()
+            self.assertIsNotNone(recalc)
+
 
 class MockRankingController(DefaultRankingController):
     recalculation_result = ('serialized', ['1st', '2nd', '3rd'])

oioioi/rankings/urls.py

@@ -10,4 +10,6 @@
         name='ranking'),
     url(r'^ranking/(?P<key>[a-z0-9_-]+)/csv/$', views.ranking_csv_view,
             name='ranking_csv'),
+    url(r'^ranking/(?P<key>[a-z0-9_-]+)/invalidate/$',
+            views.ranking_invalidate_view, name='ranking_invalidate'),
 ]

oioioi/rankings/views.py

@@ -5,6 +5,7 @@
 from django.shortcuts import redirect
 from django.template.response import TemplateResponse
 from django.utils.translation import ugettext_lazy as _
+from django.views.decorators.http import require_POST
 from six.moves import zip
 
 from oioioi.base.menu import menu_registry
@@ -14,6 +15,7 @@
 from oioioi.contests.utils import (can_enter_contest, contest_exists,
                                    is_contest_admin)
 from oioioi.rankings.forms import FilterUsersInRankingForm
+from oioioi.rankings.models import Ranking
 
 
 @make_request_condition
@@ -119,3 +121,12 @@ def ranking_csv_view(request, key):
         raise Http404
 
     return rcontroller.render_ranking_to_csv(request, key)
+
+@enforce_condition(contest_exists & is_contest_admin)
+@require_POST
+def ranking_invalidate_view(request, key):
+    rcontroller = request.contest.controller.ranking_controller()
+    full_key = rcontroller.get_full_key(request, key)
+    ranking = Ranking.objects.filter(key=full_key)
+    Ranking.invalidate_queryset(ranking)
+    return redirect('ranking', key=key)