I am getting stuck trying to upgrade to 0.8.x, as I can't get correlation
to work with nested subquery in column property. Here's a slightly absurd
example for illustration:
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Phone(Base):
__tablename__ = 'phones'
id = Column(Integer, primary_key=True)
number = Column(String(20))
contact_id = Column(Integer, ForeignKey('contacts.id'))
contact = relationship('Contact', backref='phones')
class Contact(Base):
__tablename__ = 'contacts'
id = Column(Integer, primary_key=True)
name = Column(String(200))
t = select(
[Phone.number.label('value')],
Phone.contact_id == Contact.id,
).correlate(Contact.__table__).alias('t')
Contact.phone_numbers = column_property(
select(
[func.string_agg(t.c.value, ', ')],
).as_scalar().label('phone_numbers'),
deferred=True,
)
session = Session()
print session.query(Contact).order_by(Contact.phone_numbers)
"""
0.7.x:
SELECT contacts.id AS contacts_id, contacts.name AS contacts_name
FROM contacts ORDER BY (SELECT string_agg(t.value, :string_agg_2) AS
string_agg_1
FROM (SELECT phones.number AS value
FROM phones
WHERE phones.contact_id = contacts.id) AS t)
0.8.x:
SELECT contacts.id AS contacts_id, contacts.name AS contacts_name
FROM contacts ORDER BY (SELECT string_agg(t.value, :string_agg_2) AS
string_agg_1
FROM (SELECT phones.number AS value
FROM phones, contacts
WHERE phones.contact_id = contacts.id) AS t)
"""
I tried `correlate_except` but it doesn't work in this case either. Perhaps
a side effect from ticket:2668?
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