title: using :scope to show results without adding a new action
body: <p>I'm looking to use :scope in my rails 3.1 app and need a little direction on how to implement them correctly. I understand that you write the logic in the model (to extract the data you need), but my question comes on the next steps. </p>
  
  <p>For example:  I have a "Piece" of information. Each "Piece" has a Topic and Audience among other things. I'd like to use scopes to display all "Pieces" of information for a given Topic or Audience without writing new actions in my controller. </p>
  
  <p>Essentially, I'm not sure how to link to these views without creating new actions in the controller and then just using the typical link_to. I'd like to use the scopes I've written.</p>
  
  <p>I'm looking for the correct (and most appropriate) way to get this done.</p>
  
  <p>Thanks in advance for any help on this.</p>