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Fix DateField.to_representation to work with Python 2 unicode. #3819


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@m1kola m1kola commented Jan 10, 2016


Seems like DateField.to_representation doesn't work with unicode values on Python 2.*, but it can accept str values. I think it should work with unicode too.

Here is example:

from rest_framework import serializers.

class Example(object):
    def __init__(self, created):
        self.created = created

class ExampleSerializer(serializers.Serializer):
    created = serializers.DateTimeField()

example = Example(created=u'2016-01-10')
es = ExampleSerializer(example)


Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/m1kola/.virtualenvs/drf_dev/lib/python2.7/site-packages/rest_framework/", line 503, in data
    ret = super(Serializer, self).data
  File "/Users/m1kola/.virtualenvs/drf_dev/lib/python2.7/site-packages/rest_framework/", line 239, in data
    self._data = self.to_representation(self.instance)
  File "/Users/m1kola/.virtualenvs/drf_dev/lib/python2.7/site-packages/rest_framework/", line 472, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
  File "/Users/m1kola/.virtualenvs/drf_dev/lib/python2.7/site-packages/rest_framework/", line 1068, in to_representation
    value = value.isoformat()
AttributeError: 'unicode' object has no attribute 'isoformat'

I can reproduce this behaviour on 3.3.1 and master.

@m1kola m1kola force-pushed the bug/DateField-to_representation-unicode-compatibility branch 3 times, most recently from d474afc to 82d83fc Compare Jan 10, 2016
@m1kola m1kola changed the title DateField.to_representation can't work with unicode value PY2: DateField.to_representation can't work with unicode value Jan 10, 2016
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jpadilla commented Jan 11, 2016

I think this is a pretty valid enhancement. We could probably just test for six.string_types. #3809 could probably also do with this.

@@ -1139,7 +1139,7 @@ def to_representation(self, value):

if output_format.lower() == ISO_8601:
if (isinstance(value, str)):
if isinstance(value, (six.string_types, six.text_type)):
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@xordoquy xordoquy Jan 11, 2016

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string_types is enough, you don't need the test_type here

@m1kola m1kola force-pushed the bug/DateField-to_representation-unicode-compatibility branch from 82d83fc to 6b207d9 Compare Jan 11, 2016
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m1kola commented Jan 11, 2016

PR was updated according comments.

@xordoquy xordoquy added this to the 3.3.3 Release milestone Jan 11, 2016
xordoquy added a commit that referenced this pull request Jan 11, 2016

PY2: DateField.to_representation can't work with unicode value
@xordoquy xordoquy merged commit edd9c7d into encode:master Jan 11, 2016
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xordoquy commented Jan 11, 2016

Thanks !

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3 participants