#36548: GeneratedField ignores it's output field "choices" argument
-------------------------------------+-------------------------------------
Reporter: Olivier Dalang | Owner: (none)
Type: Bug | Status: closed
Component: Database layer | Version: 5.2
(models, ORM) |
Severity: Normal | Resolution: invalid
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Changes (by Sarah Boyce):
* component: Uncategorized => Database layer (models, ORM)
* resolution: => invalid
* status: new => closed
* type: Uncategorized => Bug
Comment:
Similar to #35566, `choices` needs to be set on `GeneratedField` so
{{{#!python
generated_choice = models.GeneratedField(
expression=models.F("normal_choice"),
output_field=models.CharField(choices=YearInSchool),
db_persist=False,
choices=YearInSchool,
)
}}}
In which case:
{{{#!python
myobj = MyModel.objects.create()
myobj.get_normal_choice_display()
# 'Freshman'
myobj.get_generated_choice_display()
# 'Freshman'
myobj.normal_choice # driven by the default value which wouldn't make
sense for the GeneratedField
# YearInSchool.FRESHMAN
myobj.generated_choice
# 'FR'
myobj.refresh_from_db()
myobj.normal_choice
# 'FR'
myobj.generated_choice
# 'FR'
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/36548#comment:1>
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