title: Rails: I update migration file then run db:migrate, but my schema isn't updating
body: <p>I'm trying to add an extra field to one of my tables.</p>
  
  <p>I've added the field in the migration file (under db\migrate),
  then ran 'rake db:migrate' which ran without troubles. My text editor even told me my schema.db file has been updated and needs to refresh.</p>
  
  <p>The schema file does not contain my new field and any attempts to reference the field from my views fail miserably.</p>
  
  <p>How do I do this? It is possible to update a table with an extra field via rails without having to totally drop and recreate the database again?</p>