From 31ce885bd8a16bdc4b5795a29d0219d329fdbd38 Mon Sep 17 00:00:00 2001
From: Andrey Subbota <subbota@gmail.com>
Date: Thu, 4 Jul 2024 16:10:21 +0200
Subject: [PATCH] Fix the full_path for the lateral scope

---
 lib/grape/validations/params_scope.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/grape/validations/params_scope.rb b/lib/grape/validations/params_scope.rb
index ef8d3ec1b7..2f5a2b85b8 100644
--- a/lib/grape/validations/params_scope.rb
+++ b/lib/grape/validations/params_scope.rb
@@ -190,7 +190,10 @@ def push_declared_params(attrs, **opts)
       #
       # @return [Array<Symbol>] the nesting/path of the current parameter scope
       def full_path
-        nested? ? @parent.full_path + [@element] : []
+        return (@parent.full_path + [@element]) if nested?
+        return @parent.full_path if lateral?
+
+        []
       end
 
       private