From e224061189a6a5ea2c063f3820239eed6c3a88fb Mon Sep 17 00:00:00 2001
From: Tom Christie
Date: Fri, 9 Nov 2012 17:01:20 +0000
Subject: Support for `read_only_fields` on `ModelSerializer` classes

---
 rest_framework/serializers.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'rest_framework/serializers.py')

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 95145d58..329b38f2 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -321,6 +321,7 @@ class ModelSerializerOptions(SerializerOptions):
     def __init__(self, meta):
         super(ModelSerializerOptions, self).__init__(meta)
         self.model = getattr(meta, 'model', None)
+        self.read_only_fields = getattr(meta, 'read_only_fields', ())
 
 
 class ModelSerializer(Serializer):
@@ -369,6 +370,12 @@ class ModelSerializer(Serializer):
                 field.initialize(parent=self, field_name=model_field.name)
                 ret[model_field.name] = field
 
+        for field_name in self.opts.read_only_fields:
+            assert field_name in ret, \
+                "read_only_fields on '%s' included invalid item '%s'" % \
+                (self.__class__.__name__, field_name)
+            ret[field_name].read_only = True
+
         return ret
 
     def get_pk_field(self, model_field):
-- 
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