On Saturday, January 9, 2016 at 12:31:47 PM UTC-5, Massimo Di Pierro wrote:
>
> feature. not a bug. "required" is not a form directive but a DAL 
> directive. Tells the DAL not to accept inserts if the field is missing.
>

The problem is not that the database is throwing an exception due to 
missing data. Rather, the DAL automatically adds an IS_NOT_IN_DB validator 
when unique=True, and for some reason, that validator itself is throwing an 
exception (it's not failing validation, but literally encountering a Python 
exception), but only when dbio=False.

The IS_NOT_IN_DB validator is triggering this exception in html.py:

https://github.com/web2py/web2py/blob/master/gluon/html.py#L1864

Anthony

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