From 79e18a2a06178e8c00dfafc1cfd062f2528ec2c1 Mon Sep 17 00:00:00 2001
From: Tom Christie
Date: Tue, 2 Dec 2014 09:27:40 +0000
Subject: Raise assertion error if calling .save() on a serializer with errors.
 Closes #2098.

---
 rest_framework/serializers.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 0d0a4d9a..a4140c0f 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -127,6 +127,14 @@ class BaseSerializer(Field):
             (self.__class__.__module__, self.__class__.__name__)
         )
 
+        assert hasattr(self, '_errors'), (
+            'You must call `.is_valid()` before calling `.save()`.'
+        )
+
+        assert not self.errors, (
+            'You cannot call `.save()` on a serializer with invalid data.'
+        )
+
         validated_data = dict(
             list(self.validated_data.items()) +
             list(kwargs.items())
-- 
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