Include created_at time in score_set/reset signals

This data is needed for robust grades work, and is easy enough
to include in the providing signals. I've also added the freezegun
library to test-requirements.txt to test this functionality.

submissions/api.py

@@ -737,13 +737,14 @@ def reset_score(student_id, course_id, item_id, clear_state=False):
 
     # Create a "reset" score
     try:
-        Score.create_reset_score(student_item)
+        score = Score.create_reset_score(student_item)
         # Send a signal out to any listeners who are waiting for scoring events.
         score_reset.send(
             sender=None,
             anonymous_user_id=student_id,
             course_id=course_id,
             item_id=item_id,
+            created_at=score.created_at,
         )
 
         if clear_state:
@@ -860,6 +861,7 @@ def set_score(submission_uuid, points_earned, points_possible,
             anonymous_user_id=submission_model.student_item.student_id,
             course_id=submission_model.student_item.course_id,
             item_id=submission_model.student_item.item_id,
+            created_at=score_model.created_at,
         )
     except IntegrityError:
         pass

submissions/models.py

@@ -25,12 +25,12 @@
 # Signal to inform listeners that a score has been changed
 score_set = Signal(providing_args=[
     'points_possible', 'points_earned', 'anonymous_user_id',
-    'course_id', 'item_id'
+    'course_id', 'item_id', 'created_at'
 ])
 
 # Signal to inform listeners that a score has been reset
 score_reset = Signal(
-    providing_args=['anonymous_user_id', 'course_id', 'item_id']
+    providing_args=['anonymous_user_id', 'course_id', 'item_id', 'created_at']
 )
 
 

submissions/tests/test_api.py

@@ -7,6 +7,7 @@
 from django.db import DatabaseError, connection, transaction
 from django.core.cache import cache
 from django.test import TestCase
+from freezegun import freeze_time
 from nose.tools import raises
 from mock import patch
 import pytz
@@ -301,6 +302,7 @@ def test_create_score(self):
         self._assert_score(score, 11, 12)
         self.assertFalse(ScoreAnnotation.objects.all().exists())
 
+    @freeze_time(datetime.datetime.now())
     @patch.object(score_set, 'send')
     def test_set_score_signal(self, send_mock):
         submission = api.create_submission(STUDENT_ITEM, ANSWER_ONE)
@@ -313,7 +315,8 @@ def test_set_score_signal(self, send_mock):
             points_earned=11,
             anonymous_user_id=STUDENT_ITEM['student_id'],
             course_id=STUDENT_ITEM['course_id'],
-            item_id=STUDENT_ITEM['item_id']
+            item_id=STUDENT_ITEM['item_id'],
+            created_at=datetime.datetime.now().replace(tzinfo=pytz.UTC),
         )
 
     @ddt.data(u"First score was incorrect", u"☃")

submissions/tests/test_reset_score.py

@@ -4,13 +4,16 @@
 
 import copy
 from mock import patch
+from datetime import datetime
 from django.test import TestCase
 import ddt
 from django.core.cache import cache
 from django.db import DatabaseError
 from django.dispatch import Signal
+from freezegun import freeze_time
 from submissions import api as sub_api
 from submissions.models import Score, score_reset
+import pytz
 
 
 @ddt.ddt
@@ -167,6 +170,7 @@ def test_database_error(self, create_mock):
                 self.STUDENT_ITEM['item_id'],
             )
 
+    @freeze_time(datetime.now())
     @patch.object(score_reset, 'send')
     def test_reset_score_signal(self, send_mock):
         # Create a submission for the student and score it
@@ -185,5 +189,6 @@ def test_reset_score_signal(self, send_mock):
             sender = None,
             anonymous_user_id=self.STUDENT_ITEM['student_id'],
             course_id=self.STUDENT_ITEM['course_id'],
-            item_id=self.STUDENT_ITEM['item_id']
+            item_id=self.STUDENT_ITEM['item_id'],
+            created_at=datetime.now().replace(tzinfo=pytz.UTC),
         )

test-requirements.txt

@@ -1,8 +1,10 @@
 ddt==0.8.0
 django-nose==1.4.1
+freezegun==0.1.11
 mock==1.0.1
 nose==1.3.3
 coverage==4.0.2
+python-dateutil==2.1
 
 # Quality
 pep8==1.6.2