title: Possible to generate a migration for a model?
body: <p>I already have a user model created, with all the properties I want.</p>
  
  <p>Now I want to run</p>
  
  <p>rails g scaffold users</p>
  
  <p>but ofcourse it won't work b/c there is already a user model.</p>
  
  <p>Is it possible for me to generate a migration for the current user model (generate meaning create a migration script with the current model so I can re-run it later).</p>
  
  <p>This way I can then destory the model, run the scaffold, then run the migration with the old columns that I setup earlier.</p>
  
  <p>possible?</p>