feat: warn about materials for cancelled sessions (#7959)

* feat: warn about materials for cancelled sessions

* fix: handle viewing a DocHistory material object

ietf/doc/tests.py

@@ -1683,6 +1683,17 @@ class DocTestCase(TestCase):
 
         r = self.client.get(urlreverse("ietf.doc.views_doc.document_main", kwargs=dict(name=doc.name)))
         self.assertEqual(r.status_code, 200)
+        self.assertNotContains(r, "The session for this document was cancelled.")
+
+        SchedulingEvent.objects.create(
+            session=session,
+            status_id='canceled',
+            by = Person.objects.get(user__username="marschairman"), 
+        )
+
+        r = self.client.get(urlreverse("ietf.doc.views_doc.document_main", kwargs=dict(name=doc.name)))
+        self.assertEqual(r.status_code, 200)
+        self.assertContains(r, "The session for this document was cancelled.")
 
     def test_document_ballot(self):
         doc = IndividualDraftFactory()

ietf/doc/views_doc.py

@@ -870,6 +870,13 @@ def document_main(request, name, rev=None, document_html=False):
                     and doc.group.features.has_nonsession_materials
                     and doc.type_id in doc.group.features.material_types
             )
+
+        session_statusid = None
+        actual_doc = doc if isinstance(doc,Document) else doc.doc
+        if actual_doc.session_set.count() == 1:
+            if actual_doc.session_set.get().schedulingevent_set.exists():
+                session_statusid = actual_doc.session_set.get().schedulingevent_set.order_by("-time").first().status_id
+
         return render(request, "doc/document_material.html",
                                   dict(doc=doc,
                                        top=top,
@@ -882,6 +889,7 @@ def document_main(request, name, rev=None, document_html=False):
                                        can_upload = can_upload,
                                        other_types=other_types,
                                        presentations=presentations,
+                                       session_statusid=session_statusid,
                                        ))
 
 

ietf/templates/doc/document_material.html

@@ -153,6 +153,9 @@
             </a>
         {% endif %}
     </p>
+    {% if session_statusid == "canceled" %}
+       <div class="alert alert-warning">The session for this document was cancelled.</div>
+    {% endif %}
     <div id="materials-content" class="card mt-5">
         <div class="card-header">{{ doc.name }}-{{ doc.rev }}</div>
         <div class="card-body{% if content_is_html %} text-break{% endif %}">