added PinnedLink#list_includes scope

Author: Oaphi

app/controllers/application_controller.rb

@@ -261,7 +261,7 @@ def pull_pinned_links_and_hot_questions
     end
 
     # eager loading revived collections' used relation to prevent N+1 queries
-    @pinned_links = @pinned_links.includes(post: [:community])
+    @pinned_links = @pinned_links.list_includes
     @hot_questions = @hot_questions.list_includes
   end
 

app/models/pinned_link.rb

@@ -2,6 +2,10 @@ class PinnedLink < ApplicationRecord
   include MaybeCommunityRelated
   belongs_to :post, optional: true
 
+  scope :list_includes, lambda {
+    includes(:post, post: [:community])
+  }
+
   validate :check_post_or_url
 
   # Is the link time-constrained?