If I could have Python3's nice system of chaining exceptions all the time, this 
would be an easy one.   But a little hesitant at the moment.


On Feb 8, 2013, at 1:01 PM, Kent wrote:

> right... that's exactly what I've determined to do for my session subclass.
> 
> On Friday, February 8, 2013 12:34:36 PM UTC-5, Michael Bayer wrote:
> 
> On Feb 8, 2013, at 12:22 PM, Kent wrote: 
> 
> > We often use this pattern: 
> >   
> > try: 
> >   session.query().one() 
> > except orm_exc.NoResultFound: 
> >   gracefully deal with it 
> >   
> > If the query() execution causes an autoflush, I just want to make sure that 
> > an autoflush will never raise orm_exc.NoResultFound, or we could be 
> > catching the wrong error.  Were that the case, to be safe, we'd always 
> > need: 
> >   
> > session.flush() 
> > try: 
> >   session.query().one() 
> > except orm_exc.NoResultFound: 
> >   gracefully deal with it 
> 
> 
> Well, it wont raise that right now, no, but if you had something going on in 
> a flush event that did, then it could. 
> 
> I suppose flush() should be wrapping that kind of exception so that this use 
> case can proceed. 
> 
> 
> 
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