From d933e04b04075a296a65ff51e9b0d17d552f35dd Mon Sep 17 00:00:00 2001
From: Jonathan Kim <jkimbo@gmail.com>
Date: Sat, 27 Jun 2020 14:21:24 +0100
Subject: [PATCH] Add get_underlying_type function

---
 graphene/types/utils.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/graphene/types/utils.py b/graphene/types/utils.py
index 3b195d69..1976448a 100644
--- a/graphene/types/utils.py
+++ b/graphene/types/utils.py
@@ -41,3 +41,10 @@ def get_type(_type):
     if inspect.isfunction(_type) or isinstance(_type, partial):
         return _type()
     return _type
+
+
+def get_underlying_type(_type):
+    """Get the underlying type even if it is wrapped in structures like NonNull"""
+    while hasattr(_type, "of_type"):
+        _type = _type.of_type
+    return _type