allow default boolean values to be honoured

rest_framework/fields.py

@@ -185,6 +185,9 @@ class Field(object):
         Given and object and a field name, returns the value that should be
         serialized for that field.
         """
+        if obj is None and self.default is not None:
+            return self.default
+
         if obj is None:
             return self.empty
 

rest_framework/tests/test_serializer.py

@@ -1720,3 +1720,36 @@ class TestSerializerTransformMethods(TestCase):
                 'b_renamed': None,
             }
         )
+class DefaultTrueBooleanModel(models.Model):
+    cat = models.BooleanField(default=True)
+    dog = models.BooleanField(default=True)
+
+class SerializerDefaultTrueBoolean(TestCase):
+
+    def setUp(self):
+        super(SerializerDefaultTrueBoolean, self).setUp()
+
+        class DefaultTrueBooleanSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = DefaultTrueBooleanModel
+                fields = ('cat', 'dog')
+
+        self.default_true_boolean_serializer = DefaultTrueBooleanSerializer
+
+    def test_blank_input(self):
+        serializer = self.default_true_boolean_serializer()
+        self.assertEqual(serializer.data['dog'], True)
+        self.assertEqual(serializer.data['cat'], True)
+
+
+
+    def test_enabled_as_false(self):
+        serializer = self.default_true_boolean_serializer({'cat': False, 'dog': False})
+        self.assertEqual(serializer.data['cat'], False)
+        self.assertEqual(serializer.data['dog'], False)
+
+
+    def test_enabled_as_true(self):
+        serializer = self.default_true_boolean_serializer({'cat': True, 'dog': True})
+        self.assertEqual(serializer.data['cat'], True)
+        self.assertEqual(serializer.data['dog'], True)