title: Django using multiple databases
body: <p>I have a model called <code>FieldMap</code> which is used throughout my project. I decided recently that the physical database for this model will exist on another machine (other than the <code>default</code>).</p>
  
  <p>So I now have two databases setup in my settings: <code>default</code> and <code>dev</code>.</p>
  
  <p>I can use both databases like this:</p>
  
  <pre><code>FieldMap.objects.using('dev/default').all()
  </code></pre>
  
  <p>Because my project has already been written, I dont want to have to go through code and make the changes every time I read/write from this model.</p>
  
  <p>So after all that, I was wondering if there is a way to tell a model which database to read/write from by default?</p>