#25002: Postgresql migration fails when changing a CharField to a TimeField
-------------------------------------+-------------------------------------
Reporter: dirkcuys | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: migrations | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by dirkcuys:
Old description:
> The code from the migration is as follows:
>
> {{{#!python
> migrations.AlterField(
> model_name='studygroup',
> name='time',
> field=models.TimeField(),
> ),
> }}}
>
> The field used to be a models.CharField()
>
> The error follows:
>
> {{{
> django.db.utils.ProgrammingError: column "time" cannot be cast
> automatically to type time without time zone
> HINT: Specify a USING expression to perform the conversion
> }}}
>
> I can manually fix this using SQL:
>
> {{{
> ALTER TABLE "studygroups_studygroup" ALTER COLUMN "time" TYPE time USING
> "time"::time;
> }}}
New description:
The code from the migration is as follows:
{{{#!python
migrations.AlterField(
model_name='studygroup',
name='time',
field=models.TimeField(),
),
}}}
The field used to be a models.CharField()
The error follows:
{{{
django.db.utils.ProgrammingError: column "time" cannot be cast
automatically to type time without time zone
HINT: Specify a USING expression to perform the conversion
}}}
I can manually fix this using SQL:
{{{
ALTER TABLE "studygroups_studygroup" ALTER COLUMN "time" TYPE time USING
"time"::time;
}}}
I don't have code with the problem isolated, but this project shows the
problem when configured to use postgres. http://github.com/p2pu/knight-
app/.
--
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Ticket URL: <https://code.djangoproject.com/ticket/25002#comment:2>
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