#34495: Queryset update fails when updating parent model field with default
ordering on MySQL backend
-------------------------------------+-------------------------------------
Reporter: Karolis | Owner: nobody
Ryselis |
Type: Bug | Status: new
Component: Database | Version: 3.2
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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consider the following models:
{{{
class SupplyOrderGoodServiceBase(models.Model):
supplier_price = models.DecimalField(max_digits=12, decimal_places=4)
class Meta:
ordering = ('id',)
class SupplyOrderGood(SupplyOrderGoodServiceBase):
order_good = models.ForeignKey(to="sales.OrderGood",
on_delete=models.CASCADE)
}}}
Running the following query fails:
{{{
SupplyOrderGood.objects.filter(order_good_id=order_good.pk).update(supplier_price=supplier_price)
}}}
This happens because the `SupplyOrderGood` instances do not have to be
updated, the update is on `SupplyOrderGoodServiceBase`.
`SQLUpdateCompiler` generates no SQL for `SupplyOrderGood` (`as_sql`
returns `'', []`). However, MySQL's `SQLUpdateCompiler` finds
`self.query.order_by` to be not empty and adds `ORDER BY` to an empty SQL
query. Therefore, it tries to run SQL query ` ORDER BY
`sales_supplyordergood`.`supplyordergoodservicebase_ptr_id` ASC`, which,
of course, fails.
This can be worked around by added an `.order_by()` to the query.
--
Ticket URL: <https://code.djangoproject.com/ticket/34495>
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