From 6758654c4e28dc0589147c9e962c9d4c1fd44705 Mon Sep 17 00:00:00 2001
From: Masahiro Wakame <vvakame+dev@gmail.com>
Date: Wed, 13 Oct 2021 22:19:36 +0900
Subject: [PATCH] raise panic when nested @requires are used on federation
 (#1655)

---
 plugin/federation/federation.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/plugin/federation/federation.go b/plugin/federation/federation.go
index 7d9abc9774..cdcea8c4f0 100644
--- a/plugin/federation/federation.go
+++ b/plugin/federation/federation.go
@@ -243,7 +243,12 @@ func (f *federation) setEntities(schema *ast.Schema) {
 					if dir == nil {
 						continue
 					}
-					fields := strings.Split(dir.Arguments[0].Value.Raw, " ")
+					args := dir.Arguments[0].Value.Raw
+					if strings.Contains(args, "{") {
+						// TODO: see. https://github.com/99designs/gqlgen/issues/1138
+						panic("Nested fields are not currently supported in @requires declaration.")
+					}
+					fields := strings.Split(args, " ")
 					requireFields := []*RequireField{}
 					for _, f := range fields {
 						requireFields = append(requireFields, &RequireField{