kopia lustrzana https://github.com/glidernet/ogn-python
37 wiersze
1.4 KiB
Python
37 wiersze
1.4 KiB
Python
from sqlalchemy import Integer, DateTime, Column, ForeignKey, case, null
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from sqlalchemy.orm import relationship
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from .base import Base
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from sqlalchemy.ext.hybrid import hybrid_property
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class Logbook(Base):
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__tablename__ = 'logbook'
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id = Column(Integer, primary_key=True)
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reftime = Column(DateTime, index=True)
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takeoff_timestamp = Column(DateTime)
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takeoff_track = Column(Integer)
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landing_timestamp = Column(DateTime)
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landing_track = Column(Integer)
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max_altitude = Column(Integer)
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# Relations
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takeoff_airport_id = Column(Integer, ForeignKey('airport.id', ondelete='CASCADE'), index=True)
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takeoff_airport = relationship('Airport', foreign_keys=[takeoff_airport_id])
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landing_airport_id = Column(Integer, ForeignKey('airport.id', ondelete='CASCADE'), index=True)
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landing_airport = relationship('Airport', foreign_keys=[landing_airport_id])
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device_id = Column(Integer, ForeignKey('device.id', ondelete='CASCADE'), index=True)
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device = relationship('Device', foreign_keys=[device_id])
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@hybrid_property
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def duration(self):
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return None if (self.landing_timestamp is None or self.takeoff_timestamp is None) else self.landing_timestamp - self.takeoff_timestamp
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@duration.expression
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def duration(cls):
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return case({False: None, True: cls.landing_timestamp - cls.takeoff_timestamp}, cls.landing_timestamp != null() and cls.takeoff_timestamp != null())
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