This probably breaks quite a few apps out there? It did one for us.
Did anyone open a bug report?
Regards,
Ales
On Wednesday, March 13, 2013 1:22:57 AM UTC+1, Alex wrote:
>
> I've got the same problem. I have a field with type decimal(12,4), I can
> add a number to this field but not subtract. So instead of
> db(db.client_service.id == id).update(minutes_done =
> db.client_service.minutes_done
> - minutes)
>
> I have to write
> minutes = -minutes
> db(db.client_service.id == id).update(minutes_done =
> db.client_service.minutes_done
> + minutes)
>
> as a workaround. that makes the code much harder to read. I see no reason
> why the first query should not be possible. Any chance this will be fixed?
>
> Alex
>
> Am Mittwoch, 6. März 2013 19:30:22 UTC+1 schrieb Cliff Kachinske:
>>
>> 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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