add artist version search

app/models/artist_version.rb

@@ -7,6 +7,10 @@ class ArtistVersion < ActiveRecord::Base
       where("updater_id = ?", user_id)
     end
 
+    def updater_name(name)
+      where("updater_id = (select _.id from users _ where lower(_.name) = ?)", name.mb_chars.downcase)
+    end
+
     def search(params)
       q = scoped
       return q if params.blank?
@@ -15,6 +19,10 @@ class ArtistVersion < ActiveRecord::Base
         q = q.where("name like ? escape E'\\\\'", params[:name].to_escaped_for_sql_like)
       end
 
+      if params[:updater_name].present?
+        q = q.updater_name(params[:updater_name])
+      end
+
       if params[:updater_id].present?
         q = q.for_user(params[:updater_id].to_i)
       end