Upgrade django-rest-framework to v3.1

edx_proctoring/serializers.py

 """Defines serializers used by the Proctoring API."""
 from rest_framework import serializers
+from rest_framework.fields import DateTimeField
 from django.contrib.auth.models import User
 from edx_proctoring.models import ProctoredExam, ProctoredExamStudentAttempt, ProctoredExamStudentAllowance
 
@@ -10,6 +11,9 @@ class StrictBooleanField(serializers.BooleanField):
     where required=True is ignored.
     """
     def from_native(self, value):
+        """
+        Convert representations of a boolean to a Python `boolean`.
+        """
         if value in ('true', 't', 'True', '1'):
             return True
         if value in ('false', 'f', 'False', '0'):
@@ -70,6 +74,13 @@ class ProctoredExamStudentAttemptSerializer(serializers.ModelSerializer):
     proctored_exam = ProctoredExamSerializer()
     user = UserSerializer()
 
+    # Django Rest Framework v3 defaults to `settings.DATE_FORMAT` when serializing
+    # datetime fields.  We need to specify `format=None` to maintain the old behavior
+    # of returning raw `datetime` objects instead of unicode.
+    started_at = DateTimeField(format=None)
+    completed_at = DateTimeField(format=None)
+    last_poll_timestamp = DateTimeField(format=None)
+
     class Meta:
         """
         Meta Class

edx_proctoring/tests/test_serializer.py

@@ -30,7 +30,7 @@ class TestProctoredExamSerializer(unittest.TestCase):
         self.assertFalse(serializer.is_valid())
         self.assertDictEqual(
             {
-                'is_proctored': [u'This field is required.'],
-                'is_practice_exam': [u'This field is required.'],
+                'is_proctored': [u'"bla" is not a valid boolean.'],
+                'is_practice_exam': [u'"bla" is not a valid boolean.'],
             }, serializer.errors
         )

local_requirements.txt

@@ -2,7 +2,7 @@
 django>=1.4.12,<=1.4.22
 django-model-utils==2.3.1
 South>=0.7.6
-djangorestframework>=2.3.5,<=2.3.14
+djangorestframework>=3.1,<3.2
 django-ipware==1.1.0
 pytz>=2012h
 pycrypto>=2.6