2 files changed, 9 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
index 7ca597859d..6590e0140d 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb
@@ -10,9 +10,9 @@ module ActiveRecord
       config = config.symbolize_keys
 
       config[:username] = 'root' if config[:username].nil?
-
+      config[:flags] ||= 0
       if Mysql2::Client.const_defined? :FOUND_ROWS
-        config[:flags] = Mysql2::Client::FOUND_ROWS
+        config[:flags] |= Mysql2::Client::FOUND_ROWS
       end
 
       client = Mysql2::Client.new(config)
diff --git a/activerecord/test/cases/adapters/mysql2/connection_test.rb b/activerecord/test/cases/adapters/mysql2/connection_test.rb
index 507d024bb6..8fabcfb5c0 100644
--- a/activerecord/test/cases/adapters/mysql2/connection_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/connection_test.rb
@@ -83,6 +83,13 @@ class Mysql2ConnectionTest < ActiveRecord::Mysql2TestCase
       assert_equal [['']], result.rows
     end
   end
+  
+  def test_passing_arbitary_flags_to_adapter
+    run_without_connection do |orig_connection|             
+      ActiveRecord::Base.establish_connection(orig_connection.merge({flags: Mysql2::Client::COMPRESS}))
+      assert_equal (Mysql2::Client::COMPRESS |  Mysql2::Client::FOUND_ROWS), ActiveRecord::Base.connection.raw_connection.query_options[:flags]
+    end
+  end
 
   def test_mysql_strict_mode_specified_default
     run_without_connection do |orig_connection|