kpsul/bda/migrations/0002_add_tirage.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from django.db import migrations, models
from django.conf import settings
from django.utils import timezone


def fill_tirage_fields(apps, schema_editor):
    """
    Create a `Tirage` to fill new field `tirage` of `Participant`
    and `Spectacle` already existing.
    """
    Participant = apps.get_model("bda", "Participant")
    Spectacle = apps.get_model("bda", "Spectacle")
    Tirage = apps.get_model("bda", "Tirage")

    # These querysets only contains instances not linked to any `Tirage`.
    participants = Participant.objects.filter(tirage=None)
    spectacles = Spectacle.objects.filter(tirage=None)

    if not participants.count() and not spectacles.count():
        # No need to create a "trash" tirage.
        return

    tirage = Tirage.objects.create(
        title="Tirage de test (migration)",
        active=False,
        ouverture=timezone.now(),
        fermeture=timezone.now(),
    )

    participants.update(tirage=tirage)
    spectacles.update(tirage=tirage)


class Migration(migrations.Migration):

    dependencies = [
        ('bda', '0001_initial'),
    ]

    operations = [
        migrations.CreateModel(
            name='Tirage',
            fields=[
                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                ('title', models.CharField(max_length=300, verbose_name=b'Titre')),
                ('ouverture', models.DateTimeField(verbose_name=b"Date et heure d'ouverture du tirage")),
                ('fermeture', models.DateTimeField(verbose_name=b'Date et heure de fermerture du tirage')),
                ('token', models.TextField(verbose_name=b'Graine du tirage', blank=True)),
                ('active', models.BooleanField(default=True, verbose_name=b'Tirage actif')),
            ],
        ),
        migrations.AlterField(
            model_name='participant',
            name='user',
            field=models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE),
        ),
        # Create fields `spectacle` for `Participant` and `Spectacle` models.
        # These fields are not nullable, but we first create them as nullable
        # to give a default value for existing instances of these models.
        migrations.AddField(
            model_name='participant',
            name='tirage',
            field=models.ForeignKey(to='bda.Tirage', null=True, on_delete=models.CASCADE),
        ),
        migrations.AddField(
            model_name='spectacle',
            name='tirage',
            field=models.ForeignKey(to='bda.Tirage', null=True, on_delete=models.CASCADE),
        ),
        migrations.RunPython(fill_tirage_fields, migrations.RunPython.noop),
        migrations.AlterField(
            model_name='participant',
            name='tirage',
            field=models.ForeignKey(to='bda.Tirage', on_delete=models.CASCADE),
        ),
        migrations.AlterField(
            model_name='spectacle',
            name='tirage',
            field=models.ForeignKey(to='bda.Tirage', on_delete=models.CASCADE),
        ),
    ]