Extract Page#headline_asset

The same related_assets.find_by(headline: true) query was written by
hand in three places -- content_helper, nodes#show, and the chapter
teaser partial (which was still using assets.first, the old
position-based rule, until now). Collapsed to one method, one query.

1 files changed, 4 insertions, 0 deletions

diff --git a/app/models/page.rb b/app/models/page.rb
index c1498fc..817e3bd 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -292,6 +292,10 @@ class Page < ApplicationRecord
     end
   end
 
+  def headline_asset
+    related_assets.find_by(headline: true)&.asset
+  end
+
   # Returns true if a page has translations where one of them is significantly
   # older than the other.
   # Takes the I18n.default locale and a second :locale to test if the