From 9f3ece952f9c6f0ed7a3a5cfdb9445972017b23a Mon Sep 17 00:00:00 2001
From: NickFillot <40593450+NickFillot@users.noreply.github.com>
Date: Wed, 25 Aug 2021 09:47:44 +0200
Subject: [PATCH] Custom pickling doc

---
 README.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/README.md b/README.md
index bb8a2a0f..049761fb 100644
--- a/README.md
+++ b/README.md
@@ -160,6 +160,20 @@ With trace, we see how ``dill`` stored the lambda (``F1``) by first storing
 (which is used to handle code objects), then we handle the reference to
 the global dict (``D2``).  A ``#`` marks when the object is actually stored.
 
+Custom pickling
+
+```python
+import dill
+from sqlalchemy import create_engine
+from sqlalchemy.engine import Engine
+
+@dill.register(Engine)
+def save_sqlalchemy_engine(pickler, obj):
+    pickler._byref = getattr(pickler, '_byref', False)
+    pickler._recurse = getattr(pickler, '_recurse', False)
+    pickler.save_reduce(create_engine, (obj.url,), obj=obj)
+```
+
 
 More Information
 ----------------