Another example is
cls1

cls1_child(cls1)

cls2
  cls1_rel = sqlalchemy.rel(cls1, ...)


a = session.queyr(cls2)
a.cls1_rel - > throw exception if return cls1_child( and it is not loaded 
before)

-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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