#34716: Using subclass method as a callable for a field's default value results
in
wrong reference in the corresponding migration
-------------------------------------------+------------------------
Reporter: Nicolò Intrieri | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 4.2
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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{{{
#!div
Given the following model:
{{{#!python
class Profile(models.Model):
class Capability(models.TextChoices):
BASIC = ("BASIC", "Basic")
PROFESSIONAL = ("PROFESSIONAL", "Professional")
@classmethod
def default(cls) -> list[str]:
return [cls.BASIC]
capabilities = ArrayField(
models.CharField(choices=Capability.choices, max_length=30,
blank=True),
null=True,
default=Capability.default
)
}}}
The resulting migration contained the following:
{{{#!python
# ...
migrations.AddField(
model_name='profile',
name='capabilities',
field=django.contrib.postgres.fields.ArrayField(base_field=models.CharField(blank=True,
choices=[('BASIC', 'Basic'), ('PROFESSIONAL', 'Professional')],
max_length=30), default=appname.models.Capability.default, null=True,
size=None),
),
# ...
}}}
}}}
As you can see, migrations.AddField is passed as argument "default" a
wrong value "appname.models.Capability.default", which leads to an error
when trying to migrate. The right value should be
"appname.models.Profile.Capability.default".
--
Ticket URL: <https://code.djangoproject.com/ticket/34716>
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