# Pastebin FX82DKdz
2016-12-15 22:10:41,819 INFO sqlalchemy.engine.base.Engine {}
2016-12-15 22:10:41,823 INFO sqlalchemy.engine.base.Engine COMMIT
Traceback (most recent call last):
  File "t-rbac.py", line 55, in <module>
    cell.role_assignment.add(assignment)
AttributeError: 'Cell' object has no attribute 'role_assignment'