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from __future__ import unicode_literals
from django.test import TestCase
from rest_framework import serializers
from rest_framework.compat import BytesIO
from rest_framework.compat import six
import datetime
class UploadedFile(object):
def __init__(self, file=None, created=None):
self.file = file
self.created = created or datetime.datetime.now()
class UploadedFileSerializer(serializers.Serializer):
file = serializers.FileField(required=False)
created = serializers.DateTimeField()
def restore_object(self, attrs, instance=None):
if instance:
instance.file = attrs['file']
instance.created = attrs['created']
return instance
return UploadedFile(**attrs)
class FileSerializerTests(TestCase):
def test_create(self):
now = datetime.datetime.now()
file = BytesIO(six.b('stuff'))
file.name = 'stuff.txt'
file.size = len(file.getvalue())
serializer = UploadedFileSerializer(data={'created': now}, files={'file': file})
uploaded_file = UploadedFile(file=file, created=now)
self.assertTrue(serializer.is_valid())
self.assertEqual(serializer.object.created, uploaded_file.created)
self.assertEqual(serializer.object.file, uploaded_file.file)
self.assertFalse(serializer.object is uploaded_file)
def test_creation_failure(self):
"""
Passing files=None should result in an ValidationError
Regression test for:
https://github.com/tomchristie/django-rest-framework/issues/542
"""
now = datetime.datetime.now()
serializer = UploadedFileSerializer(data={'created': now})
self.assertTrue(serializer.is_valid())
self.assertEqual(serializer.object.created, now)
self.assertIsNone(serializer.object.file)
def test_remove_with_empty_string(self):
"""
Passing empty string as data should cause file to be removed
Test for:
https://github.com/tomchristie/django-rest-framework/issues/937
"""
now = datetime.datetime.now()
file = BytesIO(six.b('stuff'))
file.name = 'stuff.txt'
file.size = len(file.getvalue())
uploaded_file = UploadedFile(file=file, created=now)
serializer = UploadedFileSerializer(instance=uploaded_file, data={'created': now, 'file': ''})
self.assertTrue(serializer.is_valid())
self.assertEqual(serializer.object.created, uploaded_file.created)
self.assertIsNone(serializer.object.file)
def test_validation_error_with_non_file(self):
"""
Passing non-files should raise a validation error.
"""
now = datetime.datetime.now()
errmsg = 'No file was submitted. Check the encoding type on the form.'
serializer = UploadedFileSerializer(data={'created': now, 'file': 'abc'})
self.assertFalse(serializer.is_valid())
self.assertEqual(serializer.errors, {'file': [errmsg]})
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