accelerate user name query

app/controllers/announcements_controller.rb

@@ -29,7 +29,7 @@ class AnnouncementsController < ApplicationController
         locale = OrbitHelper.get_site_locale.to_s
         files = a.bulletin_files.to_fronted(locale)
         links = a.bulletin_links.map{|link|  { "link_url" => link.url, "link_title" => (link.title.blank? ? link.url : link.title) } } rescue []
-        author = User.find(a.create_user_id).member_profile.name rescue ""
+        author = User.find(a.create_user_id).member_name rescue (User.find(a.create_user_id).member_profile.name rescue "")
         desc = a.image_description
         desc = (desc.blank? ? "announcement image" : desc)
         link_to_show = a.is_external_link ? a.external_link :  OrbitHelper.url_to_show(a.to_param)