25 lines
582 B
Python
25 lines
582 B
Python
from sqlalchemy import Column, Integer, ForeignKey
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from platypush.common.db import is_defined
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from .sensors import NumericSensor
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if not is_defined('pressure_sensor'):
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class PressureSensor(NumericSensor):
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"""
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A sensor that measures pressure.
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"""
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__tablename__ = 'pressure_sensor'
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id = Column(
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Integer, ForeignKey(NumericSensor.id, ondelete='CASCADE'), primary_key=True
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)
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__table_args__ = {'extend_existing': True}
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__mapper_args__ = {
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'polymorphic_identity': __tablename__,
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}
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