#36296: Constraint validation of models with generated fields using Q crashes
with
AttributeError: 'Q' object has no attribute 'replace_expressions'
-------------------------------------+-------------------------------------
Reporter: David Sanders | Owner: (none)
Type: Bug | Status: new
Component: Database layer | Version: 5.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Simon Charette):
This relates to #34871 which has
[https://github.com/django/django/pull/19190/ a working prototype] that
implements `Q.replace_expressions`.
Note that passing a `Q` to `GeneratedFied.expression` was never entirely
supported #34805 (as it's not an expression per-se) and passing a lookup
instead most likely solves your issue
{{{#!python
is_buzz = models.GeneratedField(
expression=Exact(F("bar"), Value("buzz")),
output_field=models.BooleanField(),
db_persist=True,
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/36296#comment:1>
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