In [6]: DBSession.query(Official).all()

Out[6]: [<mvp.base.model.user.User object at 0x2b04270>]

In [7]: DBSession.query(User).all()

Out[7]:
[<mvp.base.model.user.User object at 0x2b04270>,
 <mvp.base.model.user.User object at 0x2b04490>,
 <mvp.base.model.user.User object at 0x2b045f0>,
 <mvp.base.model.user.User object at 0x2b0c490>,
 <mvp.base.model.user.User object at 0x2b0c4f0>,
 <mvp.base.model.user.User object at 0x2b0c550>,
 <mvp.base.model.user.User object at 0x2b0c5b0>]