On Nov 7, 2007, at 12:58 PM, Werner F. Bruhin wrote:
>
> Mike,
>
> Michael Bayer wrote:
>> On Nov 7, 2007, at 12:32 PM, Werner F. Bruhin wrote:
>>
>>
>>> Can you point out what I did wrong, please.
>>>
>>>
>>
>> id have to see a larger example, seems like something is marking the
>> column as modified when it should not be.
>>
> I put a little test case together, which does very little but I get
> the
> exception.
oh sorry, I misread the source code in SA earlier...for an INSERT, we
are going to insert "None" for all columns that are blank but dont
have a default. so your two options here are to put another
PassiveDefault on the column:
Column(u'consumedvalue',
Numeric(precision=18,length=2,asdecimal=True), PassiveDefault("")),
or you can leave the column out of the mapping entirely (but then
reading it requires an extra query):
mapper(Consumption, consumption_table,
exclude_properties=['consumedvalue'])
the consumedvalue column will post-fetch after an INSERT statement.
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