Fix decimal support with YAMLRenderer

rest_framework/tests/test_renderers.py

@@ -354,6 +354,17 @@ if yaml:
             data = parser.parse(StringIO(content))
             self.assertEqual(obj, data)
 
+        def test_render_decimal(self):
+            """
+            Test YAML decimal rendering.
+            """
+            renderer = YAMLRenderer()
+            content = renderer.render({'field': Decimal('111.2')}, 'application/yaml')
+            self.assertYAMLContains(content, "field: '111.2'")
+
+        def assertYAMLContains(self, content, string):
+            self.assertTrue(string in content, '%r not in %r' % (string, content))
+
 
 class XMLRendererTestCase(TestCase):
     """

rest_framework/utils/encoders.py

@@ -89,6 +89,9 @@ else:
                     node.flow_style = best_style
             return node
 
+    SafeDumper.add_representer(decimal.Decimal,
+            SafeDumper.represent_decimal)
+
     SafeDumper.add_representer(SortedDict,
             yaml.representer.SafeRepresenter.represent_dict)
     SafeDumper.add_representer(DictWithMetadata,