title: How to get a single column's values into an array
body: <p>Right now I'm doing something like this to select a single column of data:</p>
  
  <pre><code>points = Post.find_by_sql("select point from posts")
  </code></pre>
  
  <p>Then passing them to a method, I'd like my method to remain agnostic, and now have to call hash.point from within my method. How can I quickly convert this into an array and pass the data set to my method, or is there a better way? </p>