2010/11/3 Kenneth Lundström <kenneth.t.lundst...@gmail.com>:
> IS_IN_DB takes out the need for IS_NOT_EMPTY as the value has to be in the
> database it can´t be empty.
IS_THAT_TRUE? Because, I know for sure there's a use-case for
IS_EMPTY_OR(IS_IN_DB())
I've used the above pattern a lot in a web.py app I've recently
created, and it traslates to: Can be NULL or be a foreign key.
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