Add migration to custom document model

server/books/migrations/0036_migrate_to_customdocumentmodel.py

@@ -0,0 +1,22 @@
+
+from django.db import migrations
+
+from books.migrate_document_model import migrate_documents_to_custom_document_model
+
+
+def forwards_func(apps, schema_editor):
+    migrate_documents_to_custom_document_model()
+
+
+def reverse_func(apps, schema_editor):
+    pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('books', '0035_auto_20220728_0848'),
+    ]
+
+    operations = [
+        migrations.RunPython(forwards_func, reverse_func),
+    ]