Fix comments snippet admin 500

Use an explicit Wagtail Column for pending_in_article in CommentViewSet list_display and add a regression test for /cms/snippets/comments/comment/.

Fixes #37

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

apps/comments/tests/test_admin.py

@@ -1,4 +1,5 @@
 import pytest
+from django.test import override_settings
 
 from apps.blog.models import ArticleIndexPage, ArticlePage
 from apps.blog.tests.factories import AuthorFactory
@@ -79,3 +80,18 @@ def test_bulk_approve_action_marks_selected_pending_comments_as_approved(home_pa
     assert child_updates == 0
     assert pending.is_approved is True
     assert approved.is_approved is True
+
+
+@pytest.mark.django_db
+@override_settings(ALLOWED_HOSTS=["testserver", "localhost", "127.0.0.1"])
+def test_comments_snippet_index_page_loads(client, django_user_model, home_page):
+    admin = django_user_model.objects.create_superuser(
+        username="admin",
+        email="admin@example.com",
+        password="admin-pass",
+    )
+    client.force_login(admin)
+
+    response = client.get("/cms/snippets/comments/comment/")
+
+    assert response.status_code == 200

apps/comments/wagtail_hooks.py

@@ -4,7 +4,7 @@ from django.db.models import Count, Q
 from django.utils.translation import gettext_lazy as _
 from django.utils.translation import ngettext
 from wagtail import hooks
-from wagtail.admin.ui.tables import BooleanColumn
+from wagtail.admin.ui.tables import BooleanColumn, Column
 from wagtail.snippets.bulk_actions.snippet_bulk_action import SnippetBulkAction
 from wagtail.snippets.models import register_snippet
 from wagtail.snippets.permissions import get_permission_name
@@ -45,7 +45,13 @@ class CommentViewSet(SnippetViewSet):
     model = Comment
     queryset = Comment.objects.all()
     icon = "comment"
-    list_display = ["author_name", "article", BooleanColumn("is_approved"), "pending_in_article", "created_at"]
+    list_display = [
+        "author_name",
+        "article",
+        BooleanColumn("is_approved"),
+        Column("pending_in_article", label="Pending (article)"),
+        "created_at",
+    ]
     list_filter = ["is_approved"]
     search_fields = ["author_name", "body"]
     add_to_admin_menu = True
@@ -62,11 +68,5 @@ class CommentViewSet(SnippetViewSet):
             )
         )
 
-    def pending_in_article(self, obj):
-        return obj.pending_in_article
-
-    pending_in_article.short_description = "Pending (article)"  # type: ignore[attr-defined]
-
-
 register_snippet(CommentViewSet)
 hooks.register("register_bulk_action", ApproveCommentBulkAction)