title: Update action from Index controller
body: <p>What is the best practice for organizing Show, Update, Create and Delete within the MVC? I'd like to perform an update action from the index controller and before I commit any time to it I'd like to consider this. Basically I want users to be able to tag articles from the index. </p>
  
  <p>Is it a bad practice to do an update action from the index?</p>
  
  <p>What are some things I need to consider?</p>
  
  <p><strong>update</strong></p>
  
  <p>This is in fact an update action, because I have constructed a HABTM association between to models with a join table. I'm simply looking for design thoughts on performing an update action from the Index. Thank you.</p>