Update comments on rename

frappe/model/rename_doc.py

@@ -38,6 +38,7 @@ def rename_doc(doctype, old, new, force=False, merge=False, ignore_permissions=F
 	if doctype=='DocType':
 		rename_doctype(doctype, old, new, force)
 
+	update_comments(doctype, old, new, force)
 	update_attachments(doctype, old, new)
 
 	if merge:
@@ -111,6 +112,10 @@ def rename_doctype(doctype, old, new, force=False):
 	frappe.db.sql("""update tabComment set comment_doctype=%s where comment_doctype=%s""",
 		(new, old))
 
+def update_comments(doctype, old, new, force=False):
+	frappe.db.sql("""update `tabComment` set comment_docname=%s
+		where comment_doctype=%s and comment_docname=%s""", (new, doctype, old))
+
 def update_child_docs(old, new, meta):
 	# update "parent"
 	for df in meta.get_table_fields():