fix: cast values for renaming autoincrement documents

- cast `name` values to integer
- cast `link_field` values to string

frappe/model/rename_doc.py

@@ -11,7 +11,7 @@ from frappe.model.dynamic_links import get_dynamic_link_map
 from frappe.model.naming import validate_name
 from frappe.model.utils.user_settings import sync_user_settings, update_user_settings_data
 from frappe.query_builder import Field
-from frappe.utils.data import sbool
+from frappe.utils.data import sbool, cint, cstr
 from frappe.utils.password import rename_password
 from frappe.utils.scheduler import is_scheduler_inactive
 
@@ -118,8 +118,8 @@ def update_document_title(
 
 def rename_doc(
 	doctype: str | None = None,
-	old: str | None = None,
-	new: str | None = None,
+	old: str | int | None = None,
+	new: str | int | None = None,
 	force: bool = False,
 	merge: bool = False,
 	ignore_permissions: bool = False,
@@ -157,6 +157,10 @@ def rename_doc(
 	merge = sbool(merge)
 	meta = frappe.get_meta(doctype)
 
+	if meta.naming_rule == 'Autoincrement':
+		old = cint(old)
+		new = cint(new)
+
 	if validate:
 		old_doc = doc or frappe.get_doc(doctype, old)
 		out = old_doc.run_method("before_rename", old, new, merge) or {}
@@ -350,8 +354,8 @@ def update_autoname_field(doctype: str, new: str, meta: "Meta") -> None:
 
 def validate_rename(
 	doctype: str,
-	old: str,
-	new: str,
+	old: str | int,
+	new: str | int,
 	meta: "Meta",
 	merge: bool,
 	force: bool = False,
@@ -453,7 +457,9 @@ def update_link_field_values(link_fields: list[dict], old: str, new: str, doctyp
 			if parent == new and doctype == "DocType":
 				parent = old
 
-			frappe.db.set_value(parent, {docfield: old}, docfield, new, update_modified=False)
+			# when a document with autoincrement naming is renamed, the old and new values are int
+			# but link field values are always stored as varchar, so casting the values to string
+			frappe.db.set_value(parent, {docfield: cstr(old)}, docfield, cstr(new), update_modified=False)
 
 		# update cached link_fields as per new
 		if doctype == "DocType" and field["parent"] == old: