title: What is Rails' migration equivalent to MySQL's 'double' datatype?
body: <p>I can't seem to figure this one out by searching Google.</p>
  
  <p>I have an existing database which has some columns with the type of <code>double</code>, what would I write in my rails migration to create an equivalent column type? It's a relatively old database and there maybe a more suitable datatype to use completely, but I wanted to see what others thought.</p>
  
  <p>I was going to use the type of <code>:decimal</code>, is this the best choice?</p>
  
  <p>Thoughts?</p>