Display unresolved logs banner

app/controllers/lettings_logs_controller.rb

@@ -13,6 +13,7 @@ class LettingsLogsController < LogsController
         @pagy, @logs = pagy(unpaginated_filtered_logs)
         @searched = search_term.presence
         @total_count = all_logs.size
+        @unresolved_count = all_logs.where(unresolved: true, created_by: current_user).count
         render "logs/index"
       end
     end

app/views/logs/index.html.erb

@@ -4,6 +4,18 @@
 <% content_for :title, title %>
 
 <% if current_page?(controller: 'lettings_logs', action: 'index') %>
+  <% if @unresolved_count > 0 %>
+    <%= govuk_notification_banner(
+      title_text: "Important",
+      title_heading_level: 3,
+      title_id: "impacted-logs-banner",
+    ) do |notification_banner| %>
+        <% notification_banner.heading(text: "A scheme has changed and it has affected #{@unresolved_count} #{@unresolved_count > 1 ? 'logs' : 'log'}") %>
+        <div class="govuk-notification-banner__heading">
+          <a class="govuk-notification-banner__link" href="/lettings-logs/update-logs">Update logs</a>
+        </div>
+      <% end %>
+    <% end %>
   <%= render partial: "organisations/headings", locals: current_user.support? ? { main: "Lettings logs", sub: nil } : { main: "Lettings logs", sub: current_user.organisation.name } %>
 <% elsif current_page?(controller: 'sales_logs', action: 'index') %>
   <%= render partial: "organisations/headings", locals: current_user.support? ? { main: "Sales logs", sub: nil } : { main: "Sales logs", sub: current_user.organisation.name } %>

spec/requests/lettings_logs_controller_spec.rb

@@ -859,6 +859,13 @@ RSpec.describe LettingsLogsController, type: :request do
         expect(page).to have_content("You’ve completed all the logs that were affected by scheme changes.")
         page.assert_selector(".govuk-button", text: "Back to all logs")
       end
+
+      it "displays a banner on the lettings log page" do
+        get "/lettings-logs", headers:, params: {}
+        expect(page).to have_css(".govuk-notification-banner")
+        expect(page).to have_content("A scheme has changed and it has affected 3 logs")
+        expect(page).to have_link("Update logs", href: "/lettings-logs/update-logs")
+      end
     end
 
     context "when viewing a specific log affected by deactivated location" do