brotherton-erpnext/erpnext/patches/v12_0/update_is_cancelled_field.py

import frappe


def execute():
	#handle type casting for is_cancelled field
	module_doctypes = (
		('stock', 'Stock Ledger Entry'),
		('stock', 'Serial No'),
		('accounts', 'GL Entry')
	)

	for module, doctype in module_doctypes:
		if (not frappe.db.has_column(doctype, "is_cancelled")
			or frappe.db.get_column_type(doctype, "is_cancelled").lower() == "int(1)"
		):
			continue

		frappe.db.sql("""
				UPDATE `tab{doctype}`
				SET is_cancelled = 0
				where is_cancelled in ('', NULL, 'No')"""
				.format(doctype=doctype))
		frappe.db.sql("""
				UPDATE `tab{doctype}`
				SET is_cancelled = 1
				where is_cancelled = 'Yes'"""
				.format(doctype=doctype))

		frappe.reload_doc(module, "doctype", frappe.scrub(doctype))