#29845: django orm cast float field to decimal causes MySQL error
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Reporter: Ron | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 1.11
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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When I cast a FloatField to Decimal, I get an error from MySQL.
Seen in django 1.11.16 on MariaDB.
Model:
{{{
class MyModel(models.Model):
floatfield = models.FloatField('My FloatField')
decimalfield = models.DecimalField(_("My DecimalField"),
decimal_places=2, max_digits=12,
validators=[MinValueValidator(Decimal('0.01'))])
}}}
Query:
{{{
MyModel.objects.all().annotate(
floatfield_decimal=Cast('floatfield',
DecimalField(max_digits=8, decimal_places=2))).aggregate(
revenue=Sum(F('floatfield_decimal') *
F('decimalfield')))['revenue']
}}}
Then I see this error:
{{{
{ProgrammingError}(1064, "You have an error in your SQL syntax; check the
manual that corresponds to your MariaDB server version for the right
syntax to use near 'numeric(8, 2)) AS `floatfield_decimal`,
`myclass`.`decimalfield' at line 1")
}}}
I guess the `numeric` should be `Decimal`... It's not possible to examite
the query further from the debugger.
--
Ticket URL: <https://code.djangoproject.com/ticket/29845>
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