title: django-tables2 - accessing values of other columns in a table class
body: <p>Let's assume I have the following table class:</p>
  
  <pre><code>class TestTable(tables.Table):
      id = tables.Column()
      description = tables.Column()
  
      def render_description(self, value):
          return mark_safe('''&lt;a href=%s&gt;%s&lt;/a&gt;''' % (???, value))
  </code></pre>
  
  <p>Is it possible to access the value of the column "id" in the render method, so that I can build up a link which leads to the id but shows the text which depends on the 'description'-field?</p>
  
  <p>Thanks in advance!</p>