platypush/platypush/entities/magnetism.py

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from sqlalchemy import Column, Integer, ForeignKey
from platypush.common.db import is_defined
from .three_axis import ThreeAxisSensor
if not is_defined('magnetometer'):
class Magnetometer(ThreeAxisSensor):
"""
An entity that represents the value of a magnetometer.
"""
__tablename__ = 'magnetometer'
id = Column(
Integer,
ForeignKey(ThreeAxisSensor.id, ondelete='CASCADE'),
primary_key=True,
)
__table_args__ = {'extend_existing': True}
__mapper_args__ = {
'polymorphic_identity': __tablename__,
}