1 files changed, 8 insertions, 7 deletions
diff --git a/activerecord/lib/active_record.rb b/activerecord/lib/active_record.rb
index ac3f12239a..d7e7201e73 100755
--- a/activerecord/lib/active_record.rb
+++ b/activerecord/lib/active_record.rb
@@ -63,11 +63,12 @@ ActiveRecord::Base.class_eval do
   include ActiveRecord::Acts::NestedSet
 end
 
-require 'active_record/connection_adapters/mysql_adapter'
-require 'active_record/connection_adapters/postgresql_adapter'
-require 'active_record/connection_adapters/sqlite_adapter'
-require 'active_record/connection_adapters/sqlserver_adapter'
-require 'active_record/connection_adapters/db2_adapter'
-require 'active_record/connection_adapters/oci_adapter'
+unless defined?(RAILS_CONNECTION_ADAPTERS)
+  RAILS_CONNECTION_ADAPTERS = %w(mysql postgresql sqlite sqlserver db2 oci)
+end
+
+RAILS_CONNECTION_ADAPTERS.each do |adapter|
+  require "active_record/connection_adapters/#{adapter}_adapter"
+end
 
-require 'active_record/query_cache'
+require 'active_record/query_cache'
+\ No newline at end of file