fix plus mixin for rest_framework 3.0
diff --git a/planetstack/core/xoslib/methods/sliceplus.py b/planetstack/core/xoslib/methods/sliceplus.py
index fffd997..b302aec 100644
--- a/planetstack/core/xoslib/methods/sliceplus.py
+++ b/planetstack/core/xoslib/methods/sliceplus.py
@@ -9,7 +9,7 @@
 from plus import PlusSerializerMixin
 
 class SlicePlusIdSerializer(serializers.ModelSerializer, PlusSerializerMixin):
-        id = serializers.Field()

+        id = serializers.ReadOnlyField()

 

         sliceInfo = serializers.SerializerMethodField("getSliceInfo")

         humanReadableName = serializers.SerializerMethodField("getHumanReadableName")