title: django prefetch_related not working
body: <p>I am trying to export all my database with a prefetch_related but I only get data from the main model.
  My models:</p>
  
  <pre><code>class GvtCompoModel(models.Model):
      gvtCompo= models.CharField(max_length=1000, blank=False, null=False)
      ...
  
  class ActsIdsModel(models.Model):
      year = models.IntegerField(max_length=4, blank=False, null=False)
      ...
  
  class RespProposModel(models.Model):
      respPropos=models.CharField(max_length=50, unique=True)
      nationResp = models.ForeignKey('NationRespModel', blank=True, null=True, default=None)
      nationalPartyResp = models.ForeignKey('NationalPartyRespModel', blank=True, null=True, default=None)
      euGroupResp = models.ForeignKey('EUGroupRespModel', blank=True, null=True, default=None)
  
  class ActsInfoModel(models.Model):
      #id of the  act
      actId = models.OneToOneField(ActsIdsModel, primary_key=True)
      respProposId1=models.ForeignKey('RespProposModel', related_name='respProposId1', blank=True, null=True, default=None)
      respProposId2=models.ForeignKey('RespProposModel', related_name='respProposId2', blank=True, null=True, default=None)
      respProposId3=models.ForeignKey('RespProposModel', related_name='respProposId3', blank=True, null=True, default=None)
      gvtCompo= models.ManyToManyField(GvtCompoModel)
  </code></pre>
  
  <p>My view:</p>
  
  <pre><code>dumpDB=ActsInfoModel.objects.all().prefetch_related("actId", "respProposId1", "respProposId2", "respProposId3", "gvtCompo")
  for act in dumpDB.values():
      for field in act:
          print "dumpDB field", field
  </code></pre>
  
  <p>When I display "field", I see the fields from ActsInfoModel ONLY, the starting model. Is it normal?</p>