Add template caching for listing components

pyproject.toml

@@ -68,6 +68,8 @@ exclude = '''
   | referrallink_snippet_link\.html
   | onlineaccount_snippet_link\.html
   | 500\.html
+  | content-details\.html
+  | listing-item\.html
 )
 '''
 

website/common/templates/common/content-details.html

@@ -1,7 +1,7 @@
-{% load wagtailcore_tags humanize_tags %}
+{% load wagtailcore_tags humanize_tags cache util_tags %}
 
+{% cache 600|jitter:60 "content-details" page.id request.is_preview %}
   <div class="content-details field is-grouped">
-
     {% if page.date %}
       <span class="icon-text">
         <span class="icon">
@@ -33,3 +33,4 @@
       </div>
     {% endif %}
   </div>
+{% endcache %}

website/common/templates/common/listing-item.html

@@ -1,4 +1,4 @@
-{% load wagtailcore_tags %}
+{% load wagtailcore_tags cache util_tags %}
 
 <article class="media listing-item">
   <div class="columns">
@@ -13,7 +13,9 @@
       <div>
         <h2 class="title is-3"><a href="{% pageurl page %}">{{ page.title }}</a></h2>
         {% include "common/content-details.html" %}
+        {% cache 900|jitter:60 "summary" page.id request.is_preview %}
           <p>{{ page.summary }}</p>
+        {% endcache %}
       </div>
     </div>
   </div>

website/common/templatetags/util_tags.py

@@ -1,3 +1,5 @@
+import random
+
 from django.template import Library
 from django.utils.encoding import force_str
 from wagtail.models import Page
@@ -18,6 +20,11 @@ def pagefullurl(context: dict, page: Page) -> str:
     return page.get_full_url(context["request"])
 
 
+@register.filter()
+def jitter(original: float, jitter: float) -> float:
+    return random.uniform(original + jitter, original - jitter)
+
+
 @register.filter()
 def extract_text(html: str | RichText) -> str:
     return utils.extract_text(force_str(html))