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Fix tirage pk conflicts with postgres

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This commit is contained in:
Aurélien Delobelle 2017-10-17 14:41:53 +02:00
parent 47e48e36b2
commit 46187659ed
1 changed files with 43 additions and 15 deletions
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58
bda/migrations/0002_add_tirage.py
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@ -5,17 +5,34 @@ from django.db import migrations, models
from django.conf import settings
from django.utils import timezone
def forwards_func(apps, schema_editor):
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")
db_alias = schema_editor.connection.alias
Tirage.objects.using(db_alias).bulk_create([
Tirage(
id=1,
title="Tirage de test (migration)",
active=False,
ouverture=timezone.now(),
fermeture=timezone.now()),
])
# 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):
@ -35,22 +52,33 @@ class Migration(migrations.Migration):
('active', models.BooleanField(default=True, verbose_name=b'Tirage actif')),
],
),
migrations.RunPython(forwards_func, migrations.RunPython.noop),
migrations.AlterField(
model_name='participant',
name='user',
field=models.ForeignKey(to=settings.AUTH_USER_MODEL),
),
# 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(default=1, to='bda.Tirage'),
preserve_default=False,
field=models.ForeignKey(to='bda.Tirage', null=True),
),
migrations.AddField(
model_name='spectacle',
name='tirage',
field=models.ForeignKey(default=1, to='bda.Tirage'),
preserve_default=False,
field=models.ForeignKey(to='bda.Tirage', null=True),
),
migrations.RunPython(fill_tirage_fields, migrations.RunPython.noop),
migrations.AlterField(
model_name='participant',
name='tirage',
field=models.ForeignKey(to='bda.Tirage'),
),
migrations.AlterField(
model_name='spectacle',
name='tirage',
field=models.ForeignKey(to='bda.Tirage'),
),
]