fix: Customers 'primary_address' not updated automatically (#26798) (#…

…26799)

* Fix for Issue #26798

This PR is a fix for GitHub Issue 26798:
#26798

TLDR:  When an Address is updated, and that Address is a Customer's Primary Address, update the Read Only field `customer.primary_address`

* Update address.py

Co-authored-by: Deepesh Garg <42651287+deepeshgarg007@users.noreply.github.com>

erpnext/accounts/custom/address.py

@@ -1,7 +1,7 @@
 import frappe
 from frappe import _
 from frappe.contacts.doctype.address.address import Address
-from frappe.contacts.doctype.address.address import get_address_templates
+from frappe.contacts.doctype.address.address import get_address_templates, get_address_display
 
 class ERPNextAddress(Address):
 	def validate(self):
@@ -22,6 +22,16 @@ def validate_reference(self):
 			frappe.throw(_("Address needs to be linked to a Company. Please add a row for Company in the Links table."),
 				title=_("Company Not Linked"))
 
+	def on_update(self):
+		"""
+		After Address is updated, update the related 'Primary Address' on Customer.
+		"""
+		address_display = get_address_display(self.as_dict())
+		filters = { "customer_primary_address": self.name }
+		customers = frappe.db.get_all("Customer", filters=filters, as_list=True)
+		for customer_name in customers:
+			frappe.db.set_value("Customer", customer_name[0], "primary_address", address_display)
+
 @frappe.whitelist()
 def get_shipping_address(company, address = None):
 	filters = [