kopia lustrzana https://github.com/glidernet/ogn-python
45 wiersze
2.0 KiB
Python
45 wiersze
2.0 KiB
Python
from sqlalchemy.ext.hybrid import hybrid_property
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from sqlalchemy.sql import null, case
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from sqlalchemy.orm import backref
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from app import db
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from app.model import Sender
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class Logbook(db.Model):
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__tablename__ = "logbook"
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id = db.Column(db.Integer, primary_key=True)
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takeoff_timestamp = db.Column(db.DateTime)
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takeoff_track = db.Column(db.SmallInteger)
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landing_timestamp = db.Column(db.DateTime)
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landing_track = db.Column(db.SmallInteger)
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max_altitude = db.Column(db.Float(precision=2))
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# Relations
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sender_id = db.Column(db.Integer, db.ForeignKey("senders.id", ondelete="CASCADE"), index=True)
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#sender = db.relationship("Sender", foreign_keys=[sender_id], backref=backref("logbook_entries", order_by=reference.desc()) # TODO: does not work...
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sender = db.relationship("Sender", foreign_keys=[sender_id], backref=backref("logbook_entries", order_by=case({True: takeoff_timestamp, False: landing_timestamp}, takeoff_timestamp != null()).desc()))
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takeoff_airport_id = db.Column(db.Integer, db.ForeignKey("airports.id", ondelete="CASCADE"), index=True)
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takeoff_airport = db.relationship("Airport", foreign_keys=[takeoff_airport_id])
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landing_airport_id = db.Column(db.Integer, db.ForeignKey("airports.id", ondelete="CASCADE"), index=True)
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landing_airport = db.relationship("Airport", foreign_keys=[landing_airport_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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@hybrid_property
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def reference(self):
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return self.takeoff_timestamp if self.takeoff_timestamp is not None else self.landing_timestamp
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@reference.expression
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def reference(cls):
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return case({True: cls.takeoff_timestamp, False: cls.landing_timestamp}, cls.takeoff_timestamp != null())
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