At many points, a developer may want to clone a row of data for multiple reason. TheSQL Alchemy makeit easy to do in 5 steps. For example we have a table products and clone the product with id 25.
1. Select the record
product = Product.query.get(25)
2. Expunge the object from session
3. Make the product trancient
4. Change any attribute(column in database table) by assigning new data. For example, ifyou want to changename, just assign it.
product.name = "New Name"
The issue with this method is that the primary key will also be copid. So to create a newrecord, assign
None to the primary key. It will trigger the auto generation function and will have next primary key.
5. Add the object to session and commit
Putting all together
from sqlalchemy.orm.session import make_transient product = Product.query.get(25) db.session.expunge(product) make_transient(product) product.name = "New Name" product.id = None db.session.add(product) db.session.commit()
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