From 5fdeb74405a5790baed34fdee969905464a5a444 Mon Sep 17 00:00:00 2001
From: kycool <kycoolcool@gmail.com>
Date: Fri, 1 Sep 2017 18:30:59 +0800
Subject: [PATCH] check depth type which should be int

---
 rest_framework/serializers.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index a4b51ae9d..adfd8537f 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -986,6 +986,7 @@ class ModelSerializer(Serializer):
         depth = getattr(self.Meta, 'depth', 0)
 
         if depth is not None:
+            assert isinstance(depth, int), "'depth' should be integer variable."
             assert depth >= 0, "'depth' may not be negative."
             assert depth <= 10, "'depth' may not be greater than 10."