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Merge pull request #1071 from craigds/field-transform-methods
Feature: add transform_<fieldname> methods to serializers
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0bbc775b95
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@ -67,6 +67,21 @@ At this point we've translated the model instance into Python native datatypes.
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json
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# '{"email": "leila@example.com", "content": "foo bar", "created": "2012-08-22T16:20:09.822"}'
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### Customizing field representation
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Sometimes when serializing objects, you may not want to represent everything exactly the way it is in your model.
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If you need to customize the serialized value of a particular field, you can do this by creating a `transform_<fieldname>` method. For example if you needed to render some markdown from a text field:
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description = serializers.TextField()
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description_html = serializers.TextField(source='description', read_only=True)
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def transform_description_html(self, obj, value):
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from django.contrib.markup.templatetags.markup import markdown
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return markdown(value)
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These methods are essentially the reverse of `validate_<fieldname>` (see *Validation* below.)
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## Deserializing objects
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Deserialization is similar. First we parse a stream into Python native datatypes...
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@ -307,6 +307,9 @@ class BaseSerializer(WritableField):
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field.initialize(parent=self, field_name=field_name)
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key = self.get_field_key(field_name)
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value = field.field_to_native(obj, field_name)
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method = getattr(self, 'transform_%s' % field_name, None)
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if callable(method):
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value = method(obj, value)
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ret[key] = value
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ret.fields[key] = field
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return ret
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@ -1659,3 +1659,38 @@ class SerializerSupportsManyRelationships(TestCase):
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serializer = SimpleSlugSourceModelSerializer(data={'text': 'foo', 'targets': [1, 2]})
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self.assertTrue(serializer.is_valid())
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self.assertEqual(serializer.data, {'text': 'foo', 'targets': [1, 2]})
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class TransformMethodsSerializer(serializers.Serializer):
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a = serializers.CharField()
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b_renamed = serializers.CharField(source='b')
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def transform_a(self, obj, value):
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return value.lower()
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def transform_b_renamed(self, obj, value):
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if value is not None:
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return 'and ' + value
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class TestSerializerTransformMethods(TestCase):
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def setUp(self):
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self.s = TransformMethodsSerializer()
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def test_transform_methods(self):
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self.assertEqual(
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self.s.to_native({'a': 'GREEN EGGS', 'b': 'HAM'}),
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{
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'a': 'green eggs',
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'b_renamed': 'and HAM',
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}
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)
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def test_missing_fields(self):
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self.assertEqual(
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self.s.to_native({'a': 'GREEN EGGS'}),
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{
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'a': 'green eggs',
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'b_renamed': None,
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}
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)
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