I see what the code is doing.
Would this work?
if db._adapter.driver.__name__ in ('sqlite'): # maybe others?
if self.type in ('integer','bigint'):
result_type = 'integer'
elif self.type in ['date','time','datetime','double','float']:
result_type = 'double'
else:
raise SyntaxError("subtraction operation not supported for
type")
else:
result_type = self.type
On Wednesday, March 6, 2013 11:55:20 AM UTC-5, Massimo Di Pierro wrote:
>
> According to the code:
>
> if self.type in ('integer','bigint'):
> result_type = 'integer'
> elif self.type in ['date','time','datetime','double','float']:
> result_type = 'double'
> else:
> raise SyntaxError("subtraction operation not supported for
> type")
>
> what is the type of db.production_jobs.quantity_on_hand?
>
> On Wednesday, 6 March 2013 08:45:20 UTC-6, Cliff Kachinske wrote:
>>
>> V 2.4.2
>>
>> Apparently I can add a negative number in an update expression but I cannot
>> subtract a positive number.
>>
>>
>> Snippet:
>>
>> delta = new_allocation - record.quantity_allocated
>> db(db.production_jobs.id==record.production_job_id).update(
>> quantity_on_hand=db.production_jobs.quantity_on_hand - delta #
>> subtraction. DAL will not like it
>> )
>>
>> Snippet raises this exception:
>>
>> File
>> "/home/cjk/pybin/w-2-4-2/web2py/applications/Inventory/controllers/customer_order_product_lots.py",
>> line 70, in update_lot_record
>> quantity_on_hand=db.production_jobs.quantity_on_hand - delta
>> File "/home/cjk/pybin/w-2-4-2/web2py/gluon/dal.py", line 8820, in __sub__
>> raise SyntaxError("subtraction operation not supported for type")
>> SyntaxError: subtraction operation not supported for type
>>
>> Hackish workaround:
>>
>> delta = -(new_allocation - record.quantity_allocated) # flip value to
>> negative
>> db(db.production_jobs.id==record.production_job_id).update(
>> quantity_on_hand=db.production_jobs.quantity_on_hand + delta # add
>> negative number. DAL okay with this
>> )
>>
>>
>> Is this the expected behavior?
>>
>> Or am I missing something?
>>
>>
>>
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