I'm not sure if this is the cause of your problem, but I just posted an 
issue: https://github.com/web2py/pydal/issues/462

Anthony

On Thursday, April 20, 2017 at 10:30:14 AM UTC-4, Anthony wrote:
>
> On Wednesday, April 19, 2017 at 7:50:46 PM UTC-4, Chris wrote:
>>
>> Uh oh...I just removed requires from the computed field and reran my unit 
>> tests, and now validate_and_insert inserts but the computed field isn't 
>> calculated at all! I tried insert and it does the computation.
>>
>> Is there some reason validate_and_insert would not compute where insert 
>> does?
>>
>
> The computed field will not get a value if any of the fields needed by the 
> compute function are missing. Also, I notice that when 
> .validate_and_insert() is called, if any of the fields are set to None, 
> they end up getting dropped before being passed to .insert() (this should 
> probably be considered a bug). So, if you are setting a field needed by the 
> compute function to None, then that would cause the compute to fail. If 
> that's not your situation, then you'll have to show more code to diagnose 
> the problem.
>
> Anthony
>

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