How to override a function server side

ERPNext
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1

I need to override the function that calculate the amount in the quotation item quantity * rate by quantity * rate * length * width knowing i had changed in the client side but when saving the quotation it returns to the original formula I tried the two following script but I can’t seem to access the field anyone got any ideas ? thank you in advance.
I’m using doctype event:

amount = flt(doc.quantity) * flt(doc.rate) * flt(doc.length) * flt(doc.width)
frappe.db.set_value("Quotation Item", doc.name, "amount", amount)
print("Script is working")

and the second one:

def before_save(doc, event):
    doc.amount = doc.quantity * doc.rate * doc.length * doc.width
    print("Script is working")
2

Not sure if it’s the same, but I needed to overwrite a standard item price on occasion for Sales Invoices. My solution is janky, but it worked. I added a setTimeout so my custom prices were able to populate in the rate field after frappe had pulled the stand price through.

setTimeout(function () {
    frappe.model.set_value(child_row.doctype, child_row.name, "rate", item_rate);
}, 1000);
3

but isn’t your code for client-side ?

4

Yeah it’s client side. I’m sure there’d be a better solution for my application, but it’s working …for now.

5

I have already did the client-side logic but it is not enough since it does not override the original formula when saving the quotation

6

You could try using validate? Also make sure the method is added to hooks (doc_events).

def validate(doc, method):
    for item in doc.items:
        item.amount = flt(item.qty) * flt(item.rate) * flt(item.get('length', 0)) * flt(item.get('width', 0))

doc_events = {
    "Quotation": {
        "validate": "your_app.your_module.your_method"
    }
}

This is untested…