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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1224429

Title:
  Don't use ModelBase.save() inside of block session.begin()

Status in OpenStack Compute (Nova):
  Fix Released
Status in Savanna project:
  Fix Released

Bug description:
  
   Current code use ModelBase.save() always submit a commit even inside a block fo with session.begin().
  this is not purpose of using session.begin() to organize some operations  in one transaction

  
  1)session.begin() will return a SessionTransaction instance, then call SessionTransaction.__enter__()
  and do something in with block, then call SessionTransaction.__exit__(), in method __exit__() will commit or rollback automatically. See https://github.com/zzzeek/sqlalchemy/blob/master/lib/sqlalchemy/orm/session.py#L451

  2) There is also suggestion  metioned in https://github.com/openstack/nova/blob/master/nova/openstack/common/db/sqlalchemy/session.py#L76
   
  3) ModelBase.save() begin another transaction see https://github.com/openstack/nova/blob/master/nova/openstack/common/db/sqlalchemy/models.py#L51

  so we'd better don't use  ModelBase.save() inside of block
  session.begin()

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