__init__.py

# -*- coding: utf-8 -*-

from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.ext.declarative import declarative_base
from flask_sqlalchemy import SQLAlchemy

class Base(object):
    @declared_attr
    def __tablename__(cls):
        return cls.__name__.lower()

    __table_args__ = {'mysql_engine': 'InnoDB'}

    id = Column(Integer, primary_key=True)

Base = declarative_base(cls=Base)

class MyMixin(object):
    @declared_attr
    def __tablename__(cls):
        return cls.__name__.lower()

    __table_args__ = {'mysql_engine': 'InnoDB'}
    __mapper_args__= {'always_refresh': True}

    id = Column(Integer, primary_key=True)

class MyModel(MyMixin, Base):
    name = Column(String(1000))

db = SQLAlchemy()