आप MeasureMixin
कि दोनों वर्ग इनहेरिट कर सकते हैं। और फिर एक का उपयोग करें। event
तालिका विभाजन संलग्न करने के लिए।
from sqlalchemy import event
class MeasureMixin:
city_id = Column(Integer, not_null=True)
log_date = Column(Date, not_null=True)
peaktemp = Column(Integer)
unitsales = Column(Integer)
class Measure(MeasureMixin, Base):
__tablename__ = 'measures'
__table_args__ = {
postgresql_partition_by: 'RANGE (log_date)'
}
class Measure2020(MeasureMixin, Base):
__tablename__ = 'measures2020'
Measure2020.__table__.add_is_dependent_on(Measure.__table__)
event.listen(
Measure2020.__table__,
"after_create",
DDL("""ALTER TABLE measures ATTACH PARTITION measures2020
VALUES FROM ('2020-01-01') TO ('2021-01-01');""")
)