fixes import matching with local books

bookwyrm/migrations/0011_auto_20201113_1727.py

@@ -0,0 +1,33 @@
+# Generated by Django 3.0.7 on 2020-11-13 17:27
+
+from django.db import migrations, models
+
+def set_origin_id(app_registry, schema_editor):
+    db_alias = schema_editor.connection.alias
+    books = app_registry.get_model('bookwyrm', 'Book').objects.using(db_alias)
+    for book in books:
+        book.origin_id = book.remote_id
+        # the remote_id will be set automatically
+        book.remote_id = None
+        book.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0010_importjob_retry'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='author',
+            name='origin_id',
+            field=models.CharField(max_length=255, null=True),
+        ),
+        migrations.AddField(
+            model_name='book',
+            name='origin_id',
+            field=models.CharField(max_length=255, null=True),
+        ),
+        migrations.RunPython(set_origin_id),
+    ]