Implement search on explorer view

wagtail/admin/tests/pages/test_explorer_view.py

@@ -391,6 +391,43 @@ class TestPageExplorer(WagtailTestUtils, TestCase):
         self.assertEqual(response.status_code, 200)
         self.assertTemplateUsed(response, "wagtailadmin/pages/index.html")
 
+    def test_search(self):
+        response = self.client.get(
+            reverse("wagtailadmin_explore", args=(self.root_page.id,)),
+            {"q": "old"},
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertTemplateUsed(response, "wagtailadmin/pages/index.html")
+
+        page_ids = [page.id for page in response.context["pages"]]
+        self.assertEqual(page_ids, [self.old_page.id])
+
+    def test_search_results(self):
+        response = self.client.get(
+            reverse("wagtailadmin_explore_results", args=(self.root_page.id,)),
+            {"q": "old"},
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertTemplateUsed(response, "wagtailadmin/pages/index_results.html")
+
+        page_ids = [page.id for page in response.context["pages"]]
+        self.assertEqual(page_ids, [self.old_page.id])
+
+    def test_search_searches_descendants(self):
+        response = self.client.get(reverse("wagtailadmin_explore_root"), {"q": "old"})
+        self.assertEqual(response.status_code, 200)
+        page_ids = [page.id for page in response.context["pages"]]
+        self.assertEqual(page_ids, [self.old_page.id])
+
+        # search results should not include pages outside parent_page's descendants
+        response = self.client.get(
+            reverse("wagtailadmin_explore", args=(self.new_page.id,)),
+            {"q": "old"},
+        )
+        self.assertEqual(response.status_code, 200)
+        page_ids = [page.id for page in response.context["pages"]]
+        self.assertEqual(page_ids, [])
+
 
 class TestBreadcrumb(WagtailTestUtils, TestCase):
     fixtures = ["test.json"]

wagtail/admin/views/pages/listing.py

@@ -134,7 +134,13 @@ class BaseIndexView(PermissionCheckedMixin, BaseListingView):
         return ordering
 
     def get_queryset(self):
-        pages = self.parent_page.get_children().prefetch_related(
+        is_searching = bool(self.query_string)
+        if is_searching:
+            pages = self.parent_page.get_descendants()
+        else:
+            pages = self.parent_page.get_children()
+
+        pages = pages.prefetch_related(
             "content_type", "sites_rooted_here"
         ) & self.permission_policy.explorable_instances(self.request.user)
 
@@ -173,6 +179,9 @@ class BaseIndexView(PermissionCheckedMixin, BaseListingView):
 
         pages = pages.annotate_site_root_state().annotate_approved_schedule()
 
+        if is_searching:
+            pages = pages.autocomplete(self.query_string)
+
         return pages
 
     def get_paginate_by(self, queryset):