Cache column_exists? for application settings

This is most a backport of
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4987/diffs but includes
other columns that use column_exists? in a way that may cause unnecessary
schema loads.

1 files changed, 3 insertions, 3 deletions

diff --git a/app/models/application_setting.rb b/app/models/application_setting.rb
index 0dee6df525d..3cbbf8b5dfa 100644
--- a/app/models/application_setting.rb
+++ b/app/models/application_setting.rb
@@ -347,15 +347,15 @@ class ApplicationSetting < ActiveRecord::Base
   end
 
   def home_page_url_column_exists?
-    ActiveRecord::Base.connection.column_exists?(:application_settings, :home_page_url)
+    ::Gitlab::Database.cached_column_exists?(:application_settings, :home_page_url)
   end
 
   def help_page_support_url_column_exists?
-    ActiveRecord::Base.connection.column_exists?(:application_settings, :help_page_support_url)
+    ::Gitlab::Database.cached_column_exists?(:application_settings, :help_page_support_url)
   end
 
   def sidekiq_throttling_column_exists?
-    ActiveRecord::Base.connection.column_exists?(:application_settings, :sidekiq_throttling_enabled)
+    ::Gitlab::Database.cached_column_exists?(:application_settings, :sidekiq_throttling_enabled)
   end
 
   def domain_whitelist_raw