title: how to reference objects with Generic ForeignKey reference in Django
body: <p>I have a Django app with three models which use ContentTypes and Generic to try and allow the Task model to have a ForeignKey to either of the other two models using <a href="https://stackoverflow.com/questions/881792/how-to-use-dynamic-foreignkey-in-django">How to use dynamic foreignkey in Django?</a> as a guide (although I'll admit that I have no clue what's going on with this approach).</p>
  
  <pre><code>class Task(models.Model):
      date = models.DateTimeField(null = True)
      day = models.IntegerField(null = True)
      task = models.CharField(max_length = 100, null = False)
      owner = models.CharField(max_length = 25, null = True)
      notes = models.CharField(max_length = 250, null = True)
      isDone = models.BooleanField(default = False, null = False)
  
      content_type = models.ForeignKey(ContentType)
      object_id = models.PositiveIntegerField()
      maintenance = generic.GenericForeignKey('content_type', 'object_id')
  
  class Maintenance(models.Model):
      startMonth = models.CharField(max_length = 15, null = False)
      startYear = models.IntegerField(null = False)
      location = models.CharField(max_length = 20, null = False)
      mode = models.CharField(max_length = 20, null = False)
  
      taskRef = generic.GenericRelation(Task)
  
  class Template(models.Model):
      name = models.CharField(max_length = 25, null = False)
      location = models.CharField(max_length = 20, null = False)
      mode = models.CharField(max_length = 20, null = False)
  
      taskRef = generic.GenericRelation(Task)
  </code></pre>
  
  <p>Normally if Task just has a normal ForeignKey to Maintenance, I can get all the Tasks connected to any given Maintenance with Maintenance.task_set.all() but with this dynamic foreignkey system that function doesn't work.  Does anyone know of an alternative function call to achieve this affect?</p>