Sqlalchemy 在使用 func.sum 时保持 object

Question

I'm trying to use the func.sum( function while still keeping the object as output for serialization with Marshmallow.

query = (
session.query(Employee, func.sum(JobEntry.number_registered).label('hours_on_project'))
.join(JobEntry, Employee.employee_hashkey==JobEntry.employee_hashkey)
.filter(JobEntry.job_number.like('1011811%'))
.group_by(Employee)
.order_by(sa.desc('hours_on_project'))
).first()

The query returns:

(<Employee object>, 8327.0)

I would like it to return the JobEntry object in addition to the sum:

(<Employee object>, <JobEntry object>, 8327.0)

Tried adding JobEntry in the query but then I get an OperationalError..

How do I add the JobEntry object as output while still using func.sum?

Answer 1

The JobEntry table is not 1:1 with the Employee table. If they where 1:1 the answer would be adding JobEntry to the query and group by like so:

query = (
session.query(Employee, JobEntry, func.sum(JobEntry.number_registered).label('hours_on_project'))
.join(JobEntry, Employee.employee_hashkey==JobEntry.employee_hashkey)
.filter(JobEntry.job_number.like('1011811%'))
.group_by(Employee, JobEntry)
.order_by(sa.desc('hours_on_project'))

)

Adding JobEntry to 1:M is possible, but would be wrong in my case..