Fixing the count problem on peer api, completed assessments.

apps/openassessment/assessment/models.py

@@ -417,6 +417,10 @@ class PeerWorkflowItem(models.Model):
     associated workflow represents the scorer of the given submission, and the
     assessment represents the completed assessment for this work item.
 
+    Assessments are represented as their ID, defaulting to -1. This is done to
+    optimized complex queries against PeerWorkflowItems with the Assessments
+    indexed, whereas a Null reference would be costly.
+
     """
     scorer_id = models.ForeignKey(PeerWorkflow, related_name='items')
     submission_uuid = models.CharField(max_length=128, db_index=True)

apps/openassessment/assessment/peer_api.py

@@ -332,7 +332,7 @@ def has_finished_required_evaluating(student_item_dict, required_assessments):
     count = 0
     if workflow:
         done = _check_student_done_grading(workflow, required_assessments)
-        count = workflow.items.all().count()
+        count = workflow.items.all().exclude(assessment=-1).count()
     return done, count
 
 

apps/openassessment/assessment/test/test_peer.py

@@ -155,6 +155,25 @@ class TestPeerApi(TestCase):
         self.assertEqual(1, len(assessments))
         self.assertEqual(assessments[0]["scored_at"], MONDAY)
 
+    def test_has_finished_evaluation(self):
+        """
+        Verify unfinished assessments do not get counted when determining a
+        complete workflow.
+        """
+        tim_sub, tim = self._create_student_and_submission("Tim", "Tim's answer")
+        bob_sub, bob = self._create_student_and_submission("Bob", "Bob's answer")
+        sub = peer_api.get_submission_to_assess(bob, REQUIRED_GRADED)
+        self.assertEqual(sub["uuid"], tim_sub["uuid"])
+        finished, count = peer_api.has_finished_required_evaluating(bob, 1)
+        self.assertFalse(finished)
+        self.assertEqual(count, 0)
+        peer_api.create_assessment(
+            sub["uuid"], bob["student_id"], ASSESSMENT_DICT, RUBRIC_DICT
+        )
+        finished, count = peer_api.has_finished_required_evaluating(bob, 1)
+        self.assertTrue(finished)
+        self.assertEqual(count, 1)
+
     def test_peer_assessment_workflow(self):
         tim_sub, tim = self._create_student_and_submission("Tim", "Tim's answer")
         bob_sub, bob = self._create_student_and_submission("Bob", "Bob's answer")