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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