platypush/platypush/entities/contact.py

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from sqlalchemy import Column, Integer, ForeignKey
from platypush.common.db import is_defined
from .sensors import BinarySensor
if not is_defined('contact_sensor'):
class ContactSensor(BinarySensor):
"""
A binary sensor that detects contact.
"""
__tablename__ = 'contact_sensor'
id = Column(
Integer, ForeignKey(BinarySensor.id, ondelete='CASCADE'), primary_key=True
)
__table_args__ = {'extend_existing': True}
__mapper_args__ = {
'polymorphic_identity': __tablename__,
}