Hollister wrote:
> Ok...maybe I'm missing something, but why wasn't that raised in this
> case instead of the rather cryptic exception?

I'm looking back and I don't see that we've established specifically what
"this case" is.   Would need to see that in order to investigate.

>
> On Feb 18, 4:59 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
>> On Feb 18, 2010, at 1:16 PM, Hollister wrote:
>>
>> > I ran into this also and it was caused by forgetting to map the class
>> > to the table.
>> > Make sure you have a line like:
>>
>> > orm.mapper(TaskAction, taskaction_table)
>>
>> > Mike: should there be a more specific error message for a missing
>> > mapping?
>>
>> there's a very specific error for that its
>> sqlalchemy.orm.exc.UnmappedError.
>>
>>
>>
>> > -aw
>>
>> > On Feb 3, 11:04 am, "Michael Bayer" <mike...@zzzcomputing.com> wrote:
>> >> King Simon-NFHD78 wrote:
>>
>> >>> The line below the one you're complaining about is telling you what
>> the
>> >>> column in question is:
>>
>> >>>   Invalid column expression '<class '__main__.TaskAction'>'
>>
>> >>> So somehow, you've passed your TaskAction class in a place where SA
>> is
>> >>> expecting a column expression. I think we'd need to see the command
>> that
>> >>> you actually typed in to work out what the problem is.
>>
>> >> Also, again, please upgrade to 0.5.8.   Hundreds of bugs and
>> sub-optimal
>> >> behaviors have been fixed since 0.5.4p2 so you may get better
>> results.
>>
>> >>> Simon
>>
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