Makes shelbook user required

bookwyrm/migrations/0044_auto_20210207_1924.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.0.7 on 2021-02-07 19:24
+
+import bookwyrm.models.fields
+from django.conf import settings
+from django.db import migrations
+import django.db.models.deletion
+
+def set_user(app_registry, schema_editor):
+    db_alias = schema_editor.connection.alias
+    shelfbook = app_registry.get_model('bookwyrm', 'ShelfBook')
+    for item in shelfbook.objects.using(db_alias).filter(user__isnull=True):
+        item.user = item.shelf.user
+        item.save(broadcast=False)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0043_auto_20210204_2223'),
+    ]
+
+    operations = [
+        migrations.RunPython(set_user),
+        migrations.AlterField(
+            model_name='shelfbook',
+            name='user',
+            field=bookwyrm.models.fields.ForeignKey(default=2, on_delete=django.db.models.deletion.PROTECT, to=settings.AUTH_USER_MODEL),
+            preserve_default=False,
+        ),
+    ]