title: Non-dynamic associations
body: <p>Let's say I have the models <code>Post</code>, <code>Category</code>, <code>Tag</code>.</p>
  
  <p>All of these should reference a relationship to any of the following "states": <code>Local</code>, <code>National</code>, <code>International</code>.</p>
  
  <p>I could of course, in a traditional manner, create a model for those and the other models could reference each of it's IDs.</p>
  
  <p>But I want something more "reliable" than the generated ID for a record. </p>
  
  <p>My thinking this far is to reference the (unique) title instead.</p>
  
  <p>Is there any convention for this scenario?</p>