Fooled around with this some more. And i'm pretty sure it's got to be 
something with Flask-SQLAlchemy now. I spent a few hours futzing with the 
test case and was unable to make it do anything, but as soon as I switched 
it to Flask-SQLAlchemy (https://gist.github.com/7f15df7a2d20d9736fed) The 
IntegrityError came back. So now I have a new place to go bother to figure 
out why :)

On Saturday, December 15, 2012 12:12:26 AM UTC-5, Donald Stufft wrote:
>
> Ugh nevermind me. It's late and I forgot to name the Index :/
>
> On Saturday, December 15, 2012 12:06:28 AM UTC-5, Donald Stufft wrote:
>>
>> So it appears the problem is with UniqueConstraint vs Index(..., 
>> unique=True).
>>
>> Test case: https://gist.github.com/4291461
>>
>> On Friday, December 14, 2012 11:43:19 PM UTC-5, Michael Bayer wrote:
>>>
>>> its probably some subtlety to the data that's already loaded and how the 
>>> collection is being mutated - it's unlikely Flask has anything to do with 
>>> it.   There may or may not be some less-than-ideal or buggy behavior in 
>>> association proxy, or it might be a premature flushing issue, but if you 
>>> can come up with how to reproduce that would be very helpful.
>>>
>>>
>>> On Dec 14, 2012, at 11:38 PM, Donald Stufft wrote:
>>>
>>> Hrm. I'll see what I can do. Though looking at what you posted it works 
>>> for me with that too.. So the problem must either be with Flask-SQLAlchemy 
>>> or with my own app code.
>>>
>>> On Friday, December 14, 2012 11:30:57 PM UTC-5, Michael Bayer wrote:
>>>>
>>>> I've cobbled together a complete and simplified test case given your 
>>>> mapping and example code and I cannot reproduce with either 0.7 or 0.8 - 
>>>> the count of rows in the association table is one on the first commit, and 
>>>> two on the second.
>>>>
>>>> You need to adapt the attached test case into a full reproducing case 
>>>> so that the specific trigger is illustrated...thanks.
>>>>
>>>>
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