On Aug 14, 2009, at 11:26 PM, David Bolen wrote:
> then a query like:
>
> query(ClassPeriod).join(Class_, Session).\
> options(contains_eager('class_','session'))
>
> doesn't seem to perform the eager loading:
>
> SELECT class_periods.class_id AS class_periods_class_id,
> class_periods.weekday AS class_periods_weekday,
> class_periods.start_time AS class_periods_start_time,
> class_periods.duration AS class_periods_duration,
> weekdays_1.weekday
> AS weekdays_1_weekday, weekdays_1.day AS weekdays_1_day
> FROM class_periods JOIN classes ON classes.class_id =
> class_periods.class_id JOIN sessions ON sessions.session_id =
> classes.session_id LEFT OUTER JOIN weekdays AS weekdays_1 ON
> weekdays_1.weekday = class_periods.weekday
>
>
> but if I add the intermediate class_ relationship:
>
> query(ClassPeriod).join(Class_, Session).\
> options(contains_eager('class_'),
> contains_eager('class_','session'))
mapper options always take a full path from the root class of the
query and indicate one relation() each, with the exception of
eagerload_all(). this may not be ideal for the usual
contains_eager() use case though.
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