如何使用rails运行简单的MYSQL查询

我想使用 Rails 运行一个简单的 MYSQL 查询

Select movie-title, movie-director from moving order by rating desc limit 5;

我不想要创建模型的所有开销。我只想运行查询。

做这个的最好方式是什么？
我什至无法连接

这是我的控制器的代码

ActiveRecord::Base.establish_connection ({
:adapter => "mysql2",
:host => "some-rds.amazon.com",
:username => "root",
:password => "root",
:database => "blah"})

这会产生这个错误 ActiveRecord::连接未建立

thanks

movie_title = 'Planet of the Apes'
sql = "SELECT * FROM movies WHERE title = #{ActiveRecord::Base.sanitize(movie_title)}"
ActiveRecord::Base.connection.execute(sql)