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Carlton Gibson
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Merge pull request #5375 from rpkilby/related-source-serialization
Fix default value handling for dotted sources
2 parents 7e3ba8b + 07258ca commit bafb3ec

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2 files changed

+13
-3
lines changed

2 files changed

+13
-3
lines changed

rest_framework/fields.py

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Original file line numberDiff line numberDiff line change
@@ -93,9 +93,6 @@ def get_attribute(instance, attrs):
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Also accepts either attribute lookup on objects or dictionary lookups.
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"""
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for attr in attrs:
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if instance is None:
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# Break out early if we get `None` at any point in a nested lookup.
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return None
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try:
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if isinstance(instance, collections.Mapping):
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instance = instance[attr]

tests/test_serializer.py

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@@ -411,6 +411,19 @@ def test_default_not_used_when_in_object(self):
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serializer = self.Serializer(instance)
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assert serializer.data == {'has_default': 'def', 'has_default_callable': 'ghi', 'no_default': 'abc'}
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def test_default_for_source_source(self):
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"""
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'default="something"' should be used when a traversed attribute is missing from input.
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"""
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class Serializer(serializers.Serializer):
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traversed = serializers.CharField(default='x', source='traversed.attr')
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assert Serializer({}).data == {'traversed': 'x'}
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assert Serializer({'traversed': {}}).data == {'traversed': 'x'}
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assert Serializer({'traversed': None}).data == {'traversed': 'x'}
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assert Serializer({'traversed': {'attr': 'abc'}}).data == {'traversed': 'abc'}
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class TestCacheSerializerData:
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def test_cache_serializer_data(self):

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