#12889: Using annotation unexpectedly returns DecimalFields as floats
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Reporter: KyleMac | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: SVN
Keywords: annotate | Stage: Unreviewed
Has_patch: 0 |
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Using the following models:
{{{
class Product(models.Model):
name = models.CharField(_('name'), max_length=64)
price = models.DecimalField(_('price'), max_digits=5,
decimal_places=2)
class Offer(models.Model):
name = models.CharField(_('name'), max_length=64)
start_time = models.DateTimeField(_('start time'))
end_time = models.DateTimeField(_('end time'))
var1 = models.DecimalField(_('var1'), max_digits=6, decimal_places=2)
var2 = models.DecimalField(_('var2'), max_digits=6, decimal_places=2,
null=True, blank=True)
contents = models.ManyToManyField(Product,
verbose_name=_('contents'),
related_name='offers')
}}}
Compare the following results:
{{{
now = datetime.utcnow()
# Get all running offers
offers = Offer.objects\
.filter(start_time__lte=now, end_time__gt=now)
# Will be a Decimal as expected
print type(offers[0].var1)
# Get only running offers that have some contents
offers = Offer.objects\
.filter(start_time__lte=now, end_time__gt=now)\
.annotate(num_products=Count('contents'))\
.exclude(num_products=0)
# Will be a float
print type(offers[0].var1)
}}}
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Ticket URL: <http://code.djangoproject.com/ticket/12889>
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