I worked out a solution that allowed me to get the behaviour I was looking
for, but instead of using func.array() I ended up using the
postgresql.dialect module and it's array class:
from sqlalchemy.dialects.postgresql import TIMESTAMP, array
@travel_dates.expression
def travel_dates(cls):
outbound = cls.itinerary.op('->')('outbound')
homebound = cls.itinerary.op('->')('homebound')
return array(
func.date_trunc('day',
cast(outbound.op('->')(0).op('->>')('arrival'), TIMESTAMP)),
func.date_trunc('day',
cast(outbound.op('->')(0).op('->>')('departure'), TIMESTAMP)),
func.date_trunc('day',
cast(outbound.op('->')(1).op('->>')('arrival'), TIMESTAMP)),
func.date_trunc('day',
cast(outbound.op('->')(1).op('->>')('departure'), TIMESTAMP)),
...
)
This then allows me to execute queries based upon the contents of this
array:
session.query(Itinerary).filter(Itinerary.travel_dates.any('2017-01-01')).all()
If anyone knows of a more elegant way to iterate over the nested structure
I would still appreciate feedback.
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http://www.sqlalchemy.org/
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