#29103: sqlmigrate produces byte literal in SQL for one-off empty string default
value in TextField, CharField
-------------------------------------+-------------------------------------
Reporter: qlimax | Owner: nobody
Type: Bug | Status: new
Component: | Version: 2.0
Migrations | Keywords: sqlmigrate, byte,
Severity: Normal | default value, one-off
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
-------------------------------------+-------------------------------------
{{{
$ python manage.py makemigrations myapp
You are trying to add a non-nullable field 'text1' to mytable without a
default; we can't do that (the database needs something to populate
existing rows).
Please select a fix:
1) Provide a one-off default now (will be set on all existing rows with a
null value for this column)
2) Quit, and let me add a default in models.py
Select an option: 1
Please enter the default value now, as valid Python
The datetime and django.utils.timezone modules are available, so you can
do e.g. timezone.now
Type 'exit' to exit this prompt
>>> ''
Migrations for 'myapp':
myapp/migrations/0003_somechange.py
- Add field text1 to mytable
Done.
$ python manage.py sqlmigrate myapp 0003_somechange
BEGIN;
--
-- Add field text1 to mytable
--
ALTER TABLE `myapp_mytable` ADD COLUMN `text1` longtext NOT NULL;
UPDATE `myapp_mytable` SET `text1` = b"''";
COMMIT;
$ cat myapp/migrations/0003_somechange.py
# Generated by Django 2.0.2 on 2018-02-02 11:56
from django.db import migrations, models
class Migration(migrations.Migration):
dependencies = [
('myapp', '0002_auto_20180202_1154'),
]
operations = [
migrations.AddField(
model_name='mytable',
name='text1',
field=models.TextField(default=''),
preserve_default=False,
),
]
$ python --version
Python 3.4.2
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/29103>
Django <https://code.djangoproject.com/>
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