gistfile1.txt

In [1]: import django; django.get_version()
Out[1]: '1.8'

In [2]: from django.db import transaction

In [3]: transaction.set_autocommit(False)

In [4]: from django.contrib.auth import get_user_model

In [5]: get_user_model().objects.create(username="test_24921")
---------------------------------------------------------------------------
TransactionManagementError                Traceback (most recent call last)
<ipython-input-5-364c4b9477ca> in <module>()
----> 1 get_user_model().objects.create(username="test_24921")