From 30553f7bed0ee347768955c2efd71bdbd3d78626 Mon Sep 17 00:00:00 2001
From: Marcin Lubimow <marcin@campussociety.com>
Date: Mon, 9 Oct 2017 08:16:35 +0100
Subject: [PATCH] Fix for key collision

---
 rest_framework/schemas/generators.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/rest_framework/schemas/generators.py b/rest_framework/schemas/generators.py
index 4a2aeac3660..b9c6a3cc3bc 100644
--- a/rest_framework/schemas/generators.py
+++ b/rest_framework/schemas/generators.py
@@ -70,11 +70,17 @@ def __init__(self):
         self.methods_counter = Counter()
         super(LinkNode, self).__init__()
 
-    def get_next_key(self, method):
+    def _generate_next_key(self, method):
         current_val = self.methods_counter[method]
         self.methods_counter[method] += 1
         return '{}_{}'.format(method, current_val)
 
+    def get_next_key(self, method):
+        while True:
+            key = self._generate_next_key(method)
+            if key not in self:
+                return key
+
 
 def insert_into(target, keys, value):
     """