On Wed, May 13, 2015 at 6:36 AM, Simran Singh
<er.simransing...@gmail.com> wrote:
> Hi Tom,
>
> If you see then in if block, I am creating my savepoint. At any point of
> time, if the condition is not met and control goes to else block then I want
> to rollback all the changes that are saved in transaction and redirect it to
> some other page and not commit anything to db. I am able to redirect the
> flow to some template but all the transactions are being committed and
> rollback functionality is not working.
>
Then you don't need savepoints, just abort the transaction by raising
an exception. Eg:
class UnexpectedNoAssetSpecificationException(Exception):
pass
class ReservationForm(...):
...
def process(self):
# asset_port and exclusive_assets are undefined in your sample code
# globals are bad
for asset in exclusive_assets:
inventory = Inventory.objects.filter(asset_id=asset)
asset_spec = AssetSpecification.objects.filter(
asset_id_id=inventory,
utilized_value=0).values_list('asset_id', flat=True)
if not assec_spec.count():
raise UnexpectedNoAssetSpecificationException()
port_numbers = [ port.port_number for port in asset_port ]
AssetPorts.objects.filter(
port_number__in=port_numbers).update(usage='Yes')
@transaction.atomic
def view(request):
if request.method == 'POST':
form = ReservationForm(request.POST)
if form.is_valid():
try:
with transaction.atomic():
form.process()
except UnexpectedNoAssetSpecificationException:
return error(request)
return success(request)
form = ReservationForm()
return render(request, 'reservation.html', { 'form': form, })
I'm interested what is considered "valid" in your form, given this
form processing code doesn't seem to access anything from the form.
Cheers
Tom
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