def do_prepare_twophase(self, connection, xid):

        raise NotImplementedError()
Raises a ValidationError.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/engine/interfaces.py/Dialect.do_prepare_twophase--crossover with--dataset/ETHPy150Open MongoEngine/mongoengine/mongoengine/base/fields.py/BaseField.error