#22363: namespace issues with date when used as default value
----------------------------+------------------------
Reporter: linovia | Owner: linovia
Type: Bug | Status: new
Component: Migrations | Version: 1.7-beta-1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 1
Easy pickings: 0 | UI/UX: 0
----------------------------+------------------------
While playing with Django 1.7 I noticed there was an issue with some
generated migrations.
I had a model to which I added:
{{{
some_date = models.DateField()
}}}
I ran the makemigration and it prompted me to enter a default value:
{{{
$ python manage.py makemigrations
You are trying to add a non-nullable field 'some_date' to post 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)
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 module is available, so you can do e.g. datetime.date.today()
>>> datetime.date.today()
Migrations for 'blog':
0006_post_some_date.py:
- Add field some_date to post
}}}
It created the following migration:
{{{
# encoding: utf8
from django.db import models, migrations
import datetime
class Migration(migrations.Migration):
dependencies = [
('blog', '0005_post_image_big'),
]
operations = [
migrations.AddField(
model_name='post',
name='some_date',
field=models.DateField(default=date(2014, 3, 31)),
preserve_default=False,
),
]
}}}
Now if you look at the default, it uses date(...) while it only imports
datetime and thus will not be able to run.
--
Ticket URL: <https://code.djangoproject.com/ticket/22363>
Django <https://code.djangoproject.com/>
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