Thank you very much Mike!

with session.no_autoflush: 
>     obj = session.merge(my_thing) 
>     for r in session.new: 
>         .... 
>     for r in session.dirty: 
>         ... 
>

session.new is showing the newly added :)

I'll need to experiment more to make sure all my cases are covered.

I didn't know autoflush was True by default and that merge() would 
internally flush.

Thanks for pointing that out!

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