title: Django Admin: How to access the request object in admin.py, for list_display methods?
body: <p>I've added a method <code>highlight_link</code> to my model's admin.py class:</p>
  <pre><code>class RadioGridAdmin(admin.ModelAdmin):
      
      list_display = ('start_time', highlight_link)
      
      def highlight_link(self):
          return ('some custom link')
      
      
  admin.site.register(RadioGrid, RadioGridAdmin)
  </code></pre>
  <p>It returns a custom link for (I've left out <code>highlight_link.short_description</code> for brevity) each record returned in the change list.  Which is great.  But I'd like to inspect the current query string and change the custom link based on that.  Is there a way to access the request object within <code>highlight_link</code>?</p>