Fixed pagination logic to prevent infinite next button

app/main/views/activity.py

@@ -97,10 +97,12 @@ def handle_pagination(jobs, service_id, page):
         else None
     )
     total_items = jobs.get("total", 0)
+    page_size = jobs.get("page_size", 50)
+    total_pages = (total_items + page_size - 1) // page_size
     has_next_link = jobs.get("links", {}).get("next") is not None
     next_page = (
         generate_next_dict("main.all_jobs_activity", service_id, page)
-        if has_next_link and total_items > 50
+        if has_next_link and total_items > 50 and page < total_pages
         else None
     )
     pagination = generate_pagination_pages(

app/main/views/jobs.py

@@ -254,10 +254,13 @@ def get_notifications(service_id, message_type, status_override=None):  # noqa
     next_page = None
 
     total_items = notifications.get("total", 0)
+    page_size = notifications.get("page_size", 50)
+    total_pages = (total_items + page_size - 1) // page_size
     if (
         "links" in notifications
         and notifications["links"].get("next", None)
         and total_items > 50
+        and page < total_pages
     ):
         next_page = generate_next_dict(
             "main.view_notifications", service_id, page, url_args

tests/app/main/views/test_activity.py

@@ -562,7 +562,7 @@ def test_should_show_notifications_for_a_service_with_next_previous(
         "app.notification_api_client.get_notifications_for_service",
         return_value=notification_json(
             service_one["id"], rows=50, with_links=True
-        ) | {"total": 100},
+        ) | {"total": 150},
     )
     page = client_request.get(
         "main.view_notifications",
@@ -597,6 +597,35 @@ def test_should_show_notifications_for_a_service_with_next_previous(
     assert "page 1" in prev_page_link.text.strip()
 
 
+def test_doesnt_show_next_button_on_last_page(
+    client_request,
+    service_one,
+    active_user_with_permissions,
+    mock_get_service_statistics,
+    mock_get_service_data_retention,
+    mock_get_no_api_keys,
+    mocker,
+):
+    mocker.patch(
+        "app.notification_api_client.get_notifications_for_service",
+        return_value=notification_json(
+            service_one["id"], rows=50, with_links=True
+        ) | {"total": 100},
+    )
+    page = client_request.get(
+        "main.view_notifications",
+        service_id=service_one["id"],
+        message_type="sms",
+        page=2,
+    )
+
+    next_page_link = page.find("a", {"rel": "next"})
+    prev_page_link = page.find("a", {"rel": "previous"})
+
+    assert next_page_link is None
+    assert prev_page_link is not None
+
+
 def test_doesnt_show_pagination_when_50_or_fewer_items(
     client_request,
     service_one,