Best way to customize core functionnalities of ERPNext

[Merabtene]

Hi,
I’d like to make customizations on some server side .py file like modifying Controller method of a doctype (Example modify Sales Invoice .py autoname method)

What is the best way to do this to keep these changes when updating to a new version of ERPNext ? Or is there no way of doing this ( changing code and keep it when updating to new version ). Is it possible with patches ? I saw a folder patches in ERPNext but couldn’t quite understand how to create custom patches.

[penieldev]

You should create a custom app and use hooks to override the method. The docs should help you.

https://frappeframework.com/docs/v13/user/en/python-api/hooks#override-doctype-class

[Merabtene]

What about core functions of Frappe and ERPNext (not doctype related functions) can we use hooks to override them ?

EDIT :
I found that we can override whitelisted methods
https://frappeframework.com/docs/v13/user/en/python-api/hooks#override-whitelisted-methods

What about non whitelisted methods ?

[penieldev]

You could monkey patch the non-whitelisted methods from your hooks. Check out this thread.

How to override method in frappe?

Hello, I am doing some customisation in POS? I want to add vehicle number and customer type in POS. [00 PM] I have successfully updated popup and javascript using javascript prototype and javascript class extend method. I have maintained this in another custom app using page_js hook. Now, I am stuck at erpnext python code overriding? In some cases we can use hooks before insert, after insert to write own python code, but this is not possible for current case as data is coming from local s…

[Merabtene]

Great, I didn’t know about that monkey patching method. I’ll try it out. Thanks.