Hi.

Why SA produce last UPDATE if I set report_id value?
And why it produces those two SELECTs if I do not perform read access to 
report and report.comments?
Should not it exec only one insert?

report = session.query(TripReport).get(id)
comment = TripReportComment(content=form.content.data, user=request.user, 
report_id=form.report_id.data)
report.comments.append(comment)
session.add(report)


SELECT trip_reports.id AS trip_reports_id, trip_reports.title AS 
trip_reports_ti
tle, trip_reports.content AS trip_reports_content, trip_reports.route AS 
trip_reports_route, trip_reports.date_start AS t
rip_reports_date_start, trip_reports.date_end AS trip_reports_date_end, 
trip_reports.type_id AS trip_reports_type_id, tri
p_reports.user_id AS trip_reports_user_id, trip_reports.schedule_id AS 
trip_reports_schedule_id, trip_reports.create_date
 AS trip_reports_create_date, trip_reports.comments_count AS 
trip_reports_comments_count
        FROM trip_reports
        WHERE trip_reports.id = '7'

INSERT INTO trip_report_comments (content, user_id, report_id) VALUES 
('test content', 6, '7') RETURNING trip_report_comments.id

SELECT trip_report_comments.id AS trip_report_comments_id, 
trip_report_comments.
content AS trip_report_comments_content, trip_report_comments.create_date 
AS trip_report_comments_create_date, trip_repor
t_comments.user_id AS trip_report_comments_user_id, 
trip_report_comments.report_id AS trip_report_comments_report_id
        FROM trip_report_comments
        WHERE 7 = trip_report_comments.report_id ORDER BY 
trip_report_comments.id

UPDATE trip_report_comments SET report_id=7 WHERE trip_report_comments.id = 
5

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