title: Move data from one table to another
body: <p>I need to move some user info from one db table to another.<br>
  From User to brands_users.</p>
  
  <p>I want to move user_id and brand_id to brands_users - how do I do that?</p>
  
  <p>How do i save data to a HABTM DB table?</p>
  
  <p>Thanks</p>