解决HUE报错MultipleObjectsReturned: get() returned more than one Document2 -- it returned 2!

Traceback (most recent call last):
  File "/home/work/hue-3.10.0/desktop/libs/notebook/src/notebook/decorators.py", line 81, in decorator
    return func(*args, **kwargs)
  File "/home/work/hue-3.10.0/desktop/libs/notebook/src/notebook/api.py", line 124, in execute
    history = _historify(notebook, request.user)
  File "/home/work/hue-3.10.0/desktop/libs/notebook/src/notebook/api.py", line 319, in _historify
    is_history=True
  File "/home/work/hue-3.10.0/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/db/models/manager.py", line 157, in create
    return self.get_queryset().create(**kwargs)
  File "/home/work/hue-3.10.0/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/db/models/query.py", line 322, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/work/hue-3.10.0/desktop/core/src/desktop/models.py", line 1138, in save
    home_dir = Document2.objects.get_home_directory(self.owner)
  File "/home/work/hue-3.10.0/desktop/core/src/desktop/models.py", line 935, in get_home_directory
    return self.get(owner=user, parent_directory=None, name=Document2.HOME_DIR, type=‘directory‘)
  File "/home/work/hue-3.10.0/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)
  File "/home/work/hue-3.10.0/build/env/local/lib/python2.7/site-packages/Django-1.6.10-py2.7.egg/django/db/models/query.py", line 313, in get
    (self.model._meta.object_name, num))
MultipleObjectsReturned: get() returned more than one Document2 -- it returned 2!

  def get_home_directory(self, user):
    try:
      return self.get(owner=user, parent_directory=None, name=Document2.HOME_DIR, type=‘directory‘)
    except Document2.DoesNotExist:
      return self.create_user_directories(user)