title: How to disable default_scope for a belongs_to?
body: <p>Is there a way to disable the <code>default_scope</code> for a single <code>belongs_to</code> association? The <code>default_scope</code> is fine for all but a single <code>belongs_to</code> that I would like to bypass the scope. I'm familiar with <code>with_exclusive_scope</code> however I don't think that can be used with belongs_to.</p>
  
  <p>Any suggestions?</p>
  
  <p>Context: I'm trying to allow the <code>branch_source</code> association in <a href="http://github.com/rich/acts_as_revisable" rel="noreferrer">acts_as_revisable</a> to point to a revision that is not the latest (<code>revisable_is_current</code> is false).</p>