-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
from django.db import migrations, models
+import django.db.models.deletion
import jsonfield.fields
('language', models.CharField(max_length=4)),
('imprint', models.CharField(max_length=256)),
('publishing_date', models.DateField()),
- ('isbn_pool', models.ForeignKey(to='isbn.ISBNPool')),
+ ('isbn_pool', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='isbn.ISBNPool')),
],
),
]