Slugs feature migrations

apps/collection/migrations/0013_auto_20190923_1505.py

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+# Generated by Django 2.2.4 on 2019-09-23 15:05
+from django.core.validators import EMPTY_VALUES
+from django.db import migrations, models
+
+from collection.models import Collection
+
+
+def migrate_data_forward(apps, schema_editor):
+    for instance in Collection.objects.all():
+        if instance.slug in EMPTY_VALUES:
+            instance.slug = None
+            instance.save(update_fields=['slug'])
+
+def migrate_data_backward(apps, schema_editor):
+    pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('collection', '0012_collection_slug'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='collection',
+            name='slug',
+            field=models.SlugField(null=True, verbose_name='Collection slug'),
+        ),
+        migrations.RunPython(
+            migrate_data_forward,
+            migrate_data_backward,
+        ),
+        migrations.AlterField(
+            model_name='collection',
+            name='slug',
+            field=models.SlugField(null=True, unique=True, verbose_name='Collection slug'),
+        ),
+    ]

apps/establishment/migrations/0030_auto_20190923_1505.py

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+# Generated by Django 2.2.4 on 2019-09-23 15:05
+from django.core.validators import EMPTY_VALUES
+from django.db import migrations, models
+
+from establishment.models import Establishment
+
+
+def migrate_data_forward(apps, schema_editor):
+    for instance in Establishment.objects.all():
+        if instance.slug in EMPTY_VALUES:
+            instance.slug = None
+            instance.save(update_fields=['slug'])
+
+def migrate_data_backward(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('establishment', '0029_establishment_slug'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='establishment',
+            name='slug',
+            field=models.SlugField(null=True, verbose_name='Establishment slug'),
+        ),
+        migrations.RunPython(
+            migrate_data_forward,
+            migrate_data_backward,
+        ),
+        migrations.AlterField(
+            model_name='establishment',
+            name='slug',
+            field=models.SlugField(unique=True, null=True, verbose_name='Establishment slug'),
+        ),
+    ]

apps/news/migrations/0011_auto_20190923_1505.py

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+# Generated by Django 2.2.4 on 2019-09-23 15:05
+from django.core.validators import EMPTY_VALUES
+from django.db import migrations, models
+
+from news.models import News
+
+
+def migrate_data_forward(apps, schema_editor):
+    for instance in News.objects.all():
+        if instance.slug in EMPTY_VALUES:
+            instance.slug = None
+            instance.save(update_fields=['slug'])
+
+def migrate_data_backward(apps, schema_editor):
+    pass
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('news', '0010_news_slug'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='news',
+            name='slug',
+            field=models.SlugField(null=True, verbose_name='News slug'),
+        ),
+        migrations.RunPython(
+            migrate_data_forward,
+            migrate_data_backward,
+        ),
+        migrations.AlterField(
+            model_name='news',
+            name='slug',
+            field=models.SlugField(null=True, unique=True, verbose_name='News slug'),
+        ),
+    ]