def trSave(self):
a = Account.get(self.parent_key())
if a.balance == None:
a.balance = 0
a.balance+=self.amount
a.last_change = datetime.datetime.utcnow()
a.save()
return BaseModel.save(self)
def __init__(self, parent=None, key_name=None, app=None, **entity_values):
"""初始化，主要用于初始化Taggable。"""
BaseModel.__init__(self, parent, key_name, app, **entity_values)
Taggable.__init__(self)
