[auth] Grant SQLAlchemy FlushError

[Stefano Rivera]

Query: grant x to stefanor
ERROR:scripts.ibid-plugin:Exception occured in Permissions processor of auth plugin
Traceback (most recent call last):
  File "scripts/ibid-plugin", line 121, in <module>
    processor.process(event)
  File "/home/stefanor/svk/projects/ibid/test/ibid/plugins/__init__.py", line 55, in process
    method(event, *match.groups())
  File "/home/stefanor/svk/projects/ibid/test/ibid/plugins/auth.py", line 112, in grant
    event.session.commit()
  File "/var/lib/python-support/python2.6/sqlalchemy/orm/session.py", line 557, in commit
    self.transaction.commit()
  File "/var/lib/python-support/python2.6/sqlalchemy/orm/session.py", line 262, in commit
    self._prepare_impl()
  File "/var/lib/python-support/python2.6/sqlalchemy/orm/session.py", line 246, in _prepare_impl
    self.session.flush()
  File "/var/lib/python-support/python2.6/sqlalchemy/orm/session.py", line 789, in flush
    self.uow.flush(self, objects)
  File "/var/lib/python-support/python2.6/sqlalchemy/orm/unitofwork.py", line 222, in flush
    ", nor ".join(["any parent '%s' instance via that classes' '%s' attribute" % (klass.__name__, key) for (key,klass) in _state_mapper(state).delete_orphans])
FlushError: instance <ibid.models.Permission object at 0x38d3d10> is an unsaved, pending instance and is an orphan (is not attached to any parent 'Account' instance via that classes' 'permissions' attribute)