title: adding extra attribute to a rails command
body: <p>While trying to generate a new scaffold using - <code>collection&gt; rails   generate   scaffold   Items   name:string   subcategory_id:integer   users_id:integer</code>, i missed out the 'users_id:integer' and way i can go about having this attribute on it and not by running the full command again.</p>
  
  <p>Thanks</p>