On 5/8/2009 4:32 PM, Lee Hinde wrote:
> Hi;
>
> I get the error below at a point I'm trying to add 1 to an int field.
> I'm understanding the error that django doesn't know what the type is
> for sn.
>
>
> Model:
>
> class Sequence_Number(models.Model):
> Sequence_Name = models.CharField(max_length=100)
> Next_Sequence_Number = models.IntegerField()
> LastUpdate = models.DateField(auto_now = True)
> dupefixed = models.DateField(blank=True,null=True)
>
> def __unicode__(self):
> return self.Sequence_Name
>
> Sequence Number function:
>
> @transaction.autocommit
> def get_SequenceNumber(itemToSequnce):
> try:
> sn = Sequence_Number.objects.get(Sequence_Name=itemToSequnce)
> except Sequence_Number.DoesNotExist:
> sn = Sequence_Number(Sequence_Name=itemToSequnce)
> next_number = sn.Next_Sequence_Number
> sn.Next_Sequence_Number += 1
> sn.save()
> return next_number
>
> def buildSlug(slug):
> slug = "slug__%s" % (slug)
> next_Num = get_SequenceNumber(slug)
> slug_with_number = "%s%d" % (slug,next_Num)
> return slug_with_number
>
>
>
> Traceback:
>
> File "<console>", line 2, in <module>
> File
> "/Users/leehinde/Documents/Clients/RecEnrollTNV/RecEnroll/recenrolltnv/../recenrolltnv/recenroll/models.py",
> line 314, in save
> self.Slug = buildSlug(start)
> File
> "/Users/leehinde/Documents/Clients/RecEnrollTNV/RecEnroll/recenrolltnv/../recenrolltnv/recenroll/models.py",
> line 20, in buildSlug
> next_Num = get_SequenceNumber(slug)
> File "/Library/Python/2.5/site-packages/django/db/transaction.py",
> line 223, in _autocommit
> return func(*args, **kw)
> File
> "/Users/leehinde/Documents/Clients/RecEnrollTNV/RecEnroll/recenrolltnv/../recenrolltnv/recenroll/models.py",
> line 14, in get_SequenceNumber
> sn.Next_Sequence_Number += 1
> TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'
{{{
try:
sn = Sequence_Number.objects.get(Sequence_Name=itemToSequnce)
except Sequence_Number.DoesNotExist:
sn = Sequence_Number(Sequence_Name=itemToSequnce)
next_number = sn.Next_Sequence_Number
}}}
Well, in your except block, you're just instantiating a Sequence_Number
object, so of course it doesn't have the Next_Sequence_Number attribute yet.
Did you mean to do:
{{{
Sequence_Number.objects.create(Sequence_Name=itemToSequnce)
}}}
?
--
George
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