Make comment revision work again

judge/views/comment.py

@@ -24,6 +24,8 @@ from judge.utils.views import TitleMixin
 from judge.widgets import MathJaxPagedownWidget, HeavyPreviewPageDownWidget
 from judge.comments import add_mention_notifications, del_mention_notifications
 
+import json
+
 __all__ = [
     "upvote_comment",
     "downvote_comment",
@@ -120,7 +122,12 @@ class CommentRevisionAjax(CommentMixin, DetailView):
             )
         except ValueError:
             raise Http404
-        context["revision"] = revisions[wanted]
+        revision = revisions[wanted]
+        data = json.loads(revision.serialized_data)
+        try:
+            context["body"] = data[0]["fields"]["body"]
+        except Exception:
+            context["body"] = ""
         return context
 
     def get_object(self, queryset=None):

templates/comments/revision-ajax.html

@@ -1,3 +1 @@
-{% with node=revision.object %}
-  <div class="comment-body">{{ node.body|markdown|reference|str|safe }}</div>
-{% endwith %}
+<div class="comment-body">{{ body|markdown|reference|str|safe }}</div>