dnscms: use wagtail pageviewsets everywhere

dnscms/news/admin.py

@@ -1,7 +1,7 @@
 from django.utils.translation import gettext_lazy as _
 from wagtail.admin.ui.tables import DateColumn
 from wagtail.admin.ui.tables.pages import PageStatusColumn, PageTitleColumn
-from wagtail.admin.viewsets.pages import PageListingViewSet
+from wagtail.admin.viewsets.pages import PageListingViewSet, PageViewSet
 
 from dnscms.admin import ListingRedirectChooseParentView
 from news.models import NewsPage
@@ -11,17 +11,19 @@ class NewsChooseParentView(ListingRedirectChooseParentView):
     listing_url_name = "news:index"
 
 
-class NewsPageListingViewSet(PageListingViewSet):
-    model = NewsPage
-    choose_parent_view_class = NewsChooseParentView
-    icon = "info-circle"
-    menu_label = _("News")
-    menu_order = 3
-    add_to_admin_menu = True
-    ordering = "-latest_revision_created_at"
+class NewsListingMixin:
+    """Shared model + columns for the standalone listing and the page explorer."""
 
+    model = NewsPage
+    icon = "info-circle"
     columns = [
         PageTitleColumn("title", label=_("Title"), sort_key="title", classname="title"),
+        DateColumn(
+            "first_published_at",
+            label=_("First published"),
+            sort_key="first_published_at",
+            width="10%",
+        ),
         DateColumn(
             "latest_revision_created_at",
             label=_("Updated"),
@@ -32,4 +34,19 @@ class NewsPageListingViewSet(PageListingViewSet):
     ]
 
 
-news_page_listing_viewset = NewsPageListingViewSet("news")
+class NewsSidebarViewSet(NewsListingMixin, PageListingViewSet):
+    """Standalone 'News' sidebar entry, reached independently of the page tree."""
+
+    choose_parent_view_class = NewsChooseParentView
+    menu_label = _("News")
+    menu_order = 3
+    add_to_admin_menu = True
+    ordering = "-latest_revision_created_at"
+
+
+class NewsExplorerViewSet(NewsListingMixin, PageViewSet):
+    """Applies the same columns when navigating into NewsIndex via the page explorer."""
+
+
+news_sidebar_viewset = NewsSidebarViewSet("news")
+news_explorer_viewset = NewsExplorerViewSet()