from sqlalchemy import Column, Integer, ForeignKey from platypush.common.db import is_defined from .sensors import NumericSensor if not is_defined('illuminance_sensor'): class IlluminanceSensor(NumericSensor): __tablename__ = 'illuminance_sensor' id = Column( Integer, ForeignKey(NumericSensor.id, ondelete='CASCADE'), primary_key=True ) __table_args__ = {'extend_existing': True} __mapper_args__ = { 'polymorphic_identity': __tablename__, }