title: customize select in django admin
body: <p>I have a model, one field of it is a ForeignKey, so i see select in django admin, is it possiable to customize labels of this select? </p>
  
  <pre><code>
  
  class Model(models.Model):
      name = models.CharField()
      def __unicode__(self):
           return self.name
  
  class Part(models.Model):
      name = models.CharField()
      parent =  model.ForeignKey(Model)
      def __unicode__(self):
           return self.name
      def name_with_model(self):
           return self.name + ' ' + parent.name
  
  class SmallPart(models.Model):
      name = models.CharField()
      parent =  model.ForeignKey(Part)
  </code></pre>
  
  <p>when I add new SmallPart I see select tag with names of parts, I need to see name_with_model</p>