Show number of blog posts on admin dashboard

website/blog/templates/blog/blog_post_count_summary_item.html

@@ -0,0 +1,8 @@
+{% load wagtailcore_tags wagtailadmin_tags %}
+
+<li>
+  {% icon name="edit" %}
+  <a href="{% pageurl list_page %}">
+    <span>{{ posts }}</span> Posts
+  </a>
+</li>

website/blog/wagtail_hooks.py

@@ -2,8 +2,9 @@ from django.http.request import HttpRequest
 from django.urls import reverse
 from wagtail import hooks
 from wagtail.admin.menu import MenuItem
+from wagtail.admin.site_summary import SummaryItem
 
-from .models import BlogPostTagListPage
+from .models import BlogPostListPage, BlogPostTagListPage
 
 
 class BlogPostTagsMenuItem(MenuItem):
@@ -26,6 +27,26 @@ class BlogPostTagsMenuItem(MenuItem):
         return bool(self.url)
 
 
+class BlogPostCountSummaryItem(SummaryItem):
+    template_name = "blog/blog_post_count_summary_item.html"
+
+    def is_shown(self) -> bool:
+        return BlogPostListPage.objects.exists()
+
+    def get_context_data(self, parent_context: dict) -> dict:
+        context = super().get_context_data(parent_context)
+        list_page = BlogPostListPage.objects.get()
+        context["list_page"] = list_page
+        context["posts"] = list_page.get_listing_pages().count()
+
+        return context
+
+
 @hooks.register("register_admin_menu_item")
 def register_blog_post_tags_menu_item() -> MenuItem:
     return BlogPostTagsMenuItem()
+
+
+@hooks.register("construct_homepage_summary_items")
+def register_blog_post_count_summary_item(request: HttpRequest, panels: list) -> None:
+    panels.append(BlogPostCountSummaryItem(request))