Add last-updated row to modeladmin edit page header

wagtail/contrib/modeladmin/templates/modeladmin/create.html

@@ -21,6 +21,19 @@
 
     {{ view.media.js }}
     {% prepopulated_slugs %}
+
+    <script>
+        $(function() {
+            $('[data-wagtail-tooltip]').tooltip({
+                animation: false,
+                title: function() {
+                    return $(this).attr('data-wagtail-tooltip');
+                },
+                trigger: 'hover',
+                placement: 'bottom',
+            });
+        })
+    </script>
 {% endblock %}
 
 {% block content %}

wagtail/contrib/modeladmin/templates/modeladmin/edit.html

@@ -1,6 +1,10 @@
 {% extends "modeladmin/create.html" %}
 {% load i18n wagtailadmin_tags %}
 
+{% block header %}
+    {% include "modeladmin/includes/header_with_history.html" with title=view.get_page_title subtitle=view.get_page_subtitle icon=view.header_icon tabbed=1 merged=1 latest_log_entry=latest_log_entry history_url=history_url %}
+{% endblock %}
+
 {% block form_action %}{{ view.edit_url }}{% endblock %}
 
 {% block form_actions %}

wagtail/contrib/modeladmin/templates/modeladmin/includes/header_with_history.html

@@ -0,0 +1,19 @@
+{% extends "wagtailadmin/shared/header_with_locale_selector.html" %}
+{% load wagtailadmin_tags i18n %}
+
+{% block extra_rows %}
+<div class="row last-updated">
+    {% if latest_log_entry %}
+    <ul>
+        <li>
+            <span class="avatar small" data-wagtail-tooltip="{{ latest_log_entry.user_display_name }}"><img src="{% avatar_url latest_log_entry.user size=25 %}" alt="" /></span>
+            {% trans "Last updated" %}
+            {% include "wagtailadmin/shared/last_updated.html" with last_updated=latest_log_entry.timestamp time_prefix="at" %}
+        </li>
+        {% if history_url %}
+            <li><a href="{{ history_url }}">{% icon "history" class_name="default" %} {% trans "History" %}</a></li>
+        {% endif %}
+    </ul>
+    {% endif %}
+</div>
+{% endblock %}

wagtail/contrib/modeladmin/tests/test_simple_modeladmin.py

@@ -381,6 +381,13 @@ class TestEditView(TestCase, WagtailTestUtils):
 
     def setUp(self):
         self.user = self.login()
+        ModelLogEntry.objects.create(
+            content_type=ContentType.objects.get_for_model(Book),
+            label="The Lord of the Rings",
+            action='wagtail.create',
+            timestamp=make_aware(datetime.datetime(2021, 9, 30, 10, 1, 0)),
+            object_id='1',
+        )
 
     def get(self, book_id):
         return self.client.get('/admin/modeladmintest/book/edit/%d/' % book_id)
@@ -394,6 +401,11 @@ class TestEditView(TestCase, WagtailTestUtils):
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, 'The Lord of the Rings')
 
+        # "Last updated" timestamp should be present
+        self.assertContains(response, 'data-wagtail-tooltip="Sept. 30, 2021, 10:01 a.m."')
+        # History link should be present
+        self.assertContains(response, 'href="/admin/modeladmintest/book/history/1/"')
+
         url_finder = AdminURLFinder(self.user)
         expected_url = '/admin/modeladmintest/book/edit/1/'
         self.assertEqual(url_finder.get_edit_url(Book.objects.get(id=1)), expected_url)

wagtail/contrib/modeladmin/views.py

@@ -720,6 +720,13 @@ class EditView(ModelFormView, InstanceSpecificView):
                 self.request.user, self.instance)
         }
         context.update(kwargs)
+        if self.model_admin.history_view_enabled:
+            context['latest_log_entry'] = log_registry.get_logs_for_instance(self.instance).first()
+            context['history_url'] = self.url_helper.get_action_url('history', quote(self.instance.pk))
+        else:
+            context['latest_log_entry'] = None
+            context['history_url'] = None
+
         return super().get_context_data(**context)
 
     def get_error_message(self):