Hi all,

A coworker has doing some experiments with deferred column loading and
noticed that SA doesn't raise any exception when defer(), undefer() or
undefer_group() are called with an invalid column ou group name.

In other words, if you try to follow the example from:

http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_mapper_deferred


... and call:

query.options(defer('s_u_m_m_a_ry')).all()

or

query.options(undefer_group('photozz')).all()

... no exception is raised.


I am just worried about how a typo in the column/group name could
cause SA do make more calls to my database....


[]s
Roger

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