#23408: Automaticly created migration calls callable for default only once
----------------------------+--------------------
Reporter: Harper04 | Owner: nobody
Type: Bug | Status: new
Component: Migrations | Version: 1.7
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------
Callables on properties for ModelFields are used for various reasons. One
use case is to autocreate random file names or user passwords if not
present.
The migration seems to call them only once because after the migration
every "Buchung" has the same wlan_password.
My Model:
{{{
def random_wlan_key():
return
''.join(random.SystemRandom().choice("1234567890abcdefghkmnpqrstuvwxyz")
for i in range(9))
class Buchung(models.Model):
[...]
wlan_passwort = models.CharField(max_length=10,
default=random_wlan_key)
}}}
The generated migration:
{{{
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.db import models, migrations
import main.models
class Migration(migrations.Migration):
dependencies = [
('main', '0001_initial'),
]
operations = [
migrations.AddField(
model_name='buchung',
name='wlan_passwort',
field=models.CharField(default=main.models.random_wlan_key,
max_length=10),
preserve_default=True,
),
]
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/23408>
Django <https://code.djangoproject.com/>
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