SQLAlchemy clone table row with relations

Question

Following on from this question SQLAlchemy: Modification of detached object.

This makes a copy of the object fine, but it loses any many-to-many relationships the or

Answer 1

I got this to work by walking the object graph and doing the expunge(), make_transient() and id = None steps on each object in the graph as described in SQLAlchemy: Modification of detached object.