Merge pull request #302 from edx/ormsbee/workflow_steps

Make peer assessment an optional step.

apps/openassessment/assessment/peer_api.py

@@ -72,7 +72,7 @@ class PeerAssessmentInternalError(PeerAssessmentError):
     pass
 
 
-def is_complete(submission_uuid, requirements):
+def submitter_is_finished(submission_uuid, requirements):
     try:
         workflow = PeerWorkflow.objects.get(submission_uuid=submission_uuid)
         if workflow.completed_at is not None:
@@ -99,7 +99,7 @@ def get_score(submission_uuid, requirements):
         dict with keys "points_earned" and "points_possible".
     """
     # User hasn't completed their own submission yet
-    if not is_complete(submission_uuid, requirements):
+    if not submitter_is_finished(submission_uuid, requirements):
         return None
 
     workflow = PeerWorkflow.objects.get(submission_uuid=submission_uuid)
@@ -135,6 +135,10 @@ def get_score(submission_uuid, requirements):
     }
 
 
+def assessment_is_finished(submission_uuid, requirements):
+    return bool(get_score(submission_uuid, requirements))
+
+
 def create_assessment(
         scorer_submission_uuid,
         scorer_id,

apps/openassessment/assessment/self_api.py

@@ -3,6 +3,7 @@ Public interface for self-assessment.
 """
 import logging
 from django.utils.translation import ugettext as _
+from django.db import DatabaseError
 from dogapi import dog_stats_api
 
 from submissions.api import get_submission_and_student, SubmissionNotFoundError
@@ -21,13 +22,30 @@ SELF_TYPE = "SE"
 logger = logging.getLogger("openassessment.assessment.self_api")
 
 
-class SelfAssessmentRequestError(Exception):
+class SelfAssessmentError(Exception):
+    """Generic Self Assessment Error
+
+    Raised when an error occurs while processing a request related to the
+    Self Assessment Workflow.
+
+    """
+    pass
+
+
+class SelfAssessmentRequestError(SelfAssessmentError):
     """
     There was a problem with the request for a self-assessment.
     """
     pass
 
 
+class SelfAssessmentInternalError(SelfAssessmentError):
+    """
+    There was an internal problem while accessing the self-assessment api.
+    """
+    pass
+
+
 def create_assessment(submission_uuid, user_id, options_selected, rubric_dict, scored_at=None):
     """
     Create a self-assessment for a submission.
@@ -99,7 +117,6 @@ def create_assessment(submission_uuid, user_id, options_selected, rubric_dict, s
     assessment_dict = full_assessment_dict(assessment)
     _log_assessment(assessment, submission)
 
-
     # Return the serialized assessment
     return assessment_dict
 
@@ -140,21 +157,104 @@ def get_assessment(submission_uuid):
     return serialized_assessment
 
 
-def is_complete(submission_uuid):
+def submitter_is_finished(submission_uuid, requirements):
     """
     Check whether a self-assessment has been completed for a submission.
 
     Args:
         submission_uuid (str): The unique identifier of the submission.
-
+        requirements (dict): Any attributes of the assessment module required
+            to determine if this assessment is complete. There are currently
+            no requirements for a self-assessment.
     Returns:
-        bool
+        True if the submitter has assessed their answer
+    Examples:
+        >>> submitter_is_finished('222bdf3d-a88e-11e3-859e-040ccee02800', {})
+        True
     """
     return Assessment.objects.filter(
         score_type=SELF_TYPE, submission_uuid=submission_uuid
     ).exists()
 
 
+def assessment_is_finished(submission_uuid, requirements):
+    """
+    Check whether a self-assessment has been completed. For self-assessment,
+    this function is synonymous with submitter_is_finished.
+
+    Args:
+        submission_uuid (str): The unique identifier of the submission.
+        requirements (dict): Any attributes of the assessment module required
+            to determine if this assessment is complete. There are currently
+            no requirements for a self-assessment.
+    Returns:
+        True if the assessment is complete.
+    Examples:
+        >>> assessment_is_finished('222bdf3d-a88e-11e3-859e-040ccee02800', {})
+        True
+    """
+    return submitter_is_finished(submission_uuid, requirements)
+
+
+def get_score(submission_uuid, requirements):
+    """
+    Get the score for this particular assessment.
+
+    Args:
+        submission_uuid (str): The unique identifier for the submission
+        requirements (dict): Any attributes of the assessment module required
+            to determine if this assessment is complete. There are currently
+            no requirements for a self-assessment.
+    Returns:
+        A dict of points earned and points possible for the given submission.
+        Returns None if no score can be determined yet.
+    Examples:
+        >>> get_score('222bdf3d-a88e-11e3-859e-040ccee02800', {})
+        {
+            'points_earned': 5,
+            'points_possible': 10
+        }
+    """
+    assessment = get_assessment(submission_uuid)
+    if not assessment:
+        return None
+
+    return {
+        "points_earned": assessment["points_earned"],
+        "points_possible": assessment["points_possible"]
+    }
+
+
+def get_assessment_scores_by_criteria(submission_uuid):
+    """Get the median score for each rubric criterion
+
+    Args:
+        submission_uuid (str): The submission uuid is used to get the
+            assessments used to score this submission, and generate the
+            appropriate median score.
+
+    Returns:
+        (dict): A dictionary of rubric criterion names, with a median score of
+            the peer assessments.
+
+    Raises:
+        SelfAssessmentInternalError: If any error occurs while retrieving
+            information to form the median scores, an error is raised.
+    """
+    try:
+        assessments = list(
+            Assessment.objects.filter(
+                score_type=SELF_TYPE, submission_uuid=submission_uuid
+            ).order_by('-scored_at')[:1]
+        )
+        scores = Assessment.scores_by_criterion(assessments)
+        return Assessment.get_median_score_dict(scores)
+    except DatabaseError:
+        error_message = _(u"Error getting self assessment scores for {}").format(submission_uuid)
+        logger.exception(error_message)
+        raise SelfAssessmentInternalError(error_message)
+
+
 def _log_assessment(assessment, submission):
     """
     Log the creation of a self-assessment.

apps/openassessment/assessment/test/test_peer.py

@@ -134,6 +134,7 @@ TUESDAY = datetime.datetime(2007, 9, 13, 0, 0, 0, 0, pytz.UTC)
 WEDNESDAY = datetime.datetime(2007, 9, 15, 0, 0, 0, 0, pytz.UTC)
 THURSDAY = datetime.datetime(2007, 9, 16, 0, 0, 0, 0, pytz.UTC)
 
+STEPS = ['peer', 'self']
 
 @ddt
 class TestPeerApi(CacheResetTest):
@@ -449,7 +450,7 @@ class TestPeerApi(CacheResetTest):
             'must_grade': REQUIRED_GRADED,
             'must_be_graded_by': REQUIRED_GRADED_BY
         }
-        self.assertTrue(peer_api.is_complete(tim_sub["uuid"], requirements))
+        self.assertTrue(peer_api.submitter_is_finished(tim_sub["uuid"], requirements))
 
     def test_completeness(self):
         """
@@ -788,7 +789,7 @@ class TestPeerApi(CacheResetTest):
             'must_grade': REQUIRED_GRADED,
             'must_be_graded_by': REQUIRED_GRADED_BY
         }
-        self.assertTrue(peer_api.is_complete(buffy_sub["uuid"], requirements))
+        self.assertTrue(peer_api.submitter_is_finished(buffy_sub["uuid"], requirements))
 
     def test_find_active_assessments(self):
         buffy_answer, _ = self._create_student_and_submission("Buffy", "Buffy's answer")
@@ -1137,5 +1138,5 @@ class TestPeerApi(CacheResetTest):
         new_student_item["student_id"] = student
         submission = sub_api.create_submission(new_student_item, answer, date)
         peer_api.create_peer_workflow(submission["uuid"])
-        workflow_api.create_workflow(submission["uuid"])
+        workflow_api.create_workflow(submission["uuid"], STEPS)
         return submission, new_student_item

apps/openassessment/assessment/test/test_self.py

@@ -9,7 +9,7 @@ import pytz
 from openassessment.test_utils import CacheResetTest
 from submissions.api import create_submission
 from openassessment.assessment.self_api import (
-    create_assessment, is_complete, SelfAssessmentRequestError, get_assessment
+    create_assessment, submitter_is_finished, SelfAssessmentRequestError, get_assessment
 )
 
 
@@ -60,7 +60,7 @@ class TestSelfApi(CacheResetTest):
         # Now there should be a submission, but no self-assessment
         assessment = get_assessment(submission["uuid"])
         self.assertIs(assessment, None)
-        self.assertFalse(is_complete(submission['uuid']))
+        self.assertFalse(submitter_is_finished(submission['uuid'], {}))
 
         # Create a self-assessment for the submission
         assessment = create_assessment(
@@ -70,7 +70,7 @@ class TestSelfApi(CacheResetTest):
         )
 
         # Self-assessment should be complete
-        self.assertTrue(is_complete(submission['uuid']))
+        self.assertTrue(submitter_is_finished(submission['uuid'], {}))
 
         # Retrieve the self-assessment
         retrieved = get_assessment(submission["uuid"])
@@ -198,4 +198,4 @@ class TestSelfApi(CacheResetTest):
 
     def test_is_complete_no_submission(self):
         # This submission uuid does not exist
-        self.assertFalse(is_complete('abc1234'))
+        self.assertFalse(submitter_is_finished('abc1234', {}))

apps/openassessment/management/commands/create_oa_submissions.py

@@ -9,6 +9,7 @@ from submissions import api as sub_api
 from openassessment.workflow import api as workflow_api
 from openassessment.assessment import peer_api, self_api
 
+STEPS = ['peer', 'self']
 
 
 class Command(BaseCommand):
@@ -131,7 +132,7 @@ class Command(BaseCommand):
         """
         answer = {'text': "  ".join(loremipsum.get_paragraphs(5))}
         submission = sub_api.create_submission(student_item, answer)
-        workflow_api.create_workflow(submission['uuid'])
+        workflow_api.create_workflow(submission['uuid'], STEPS)
         workflow_api.update_from_assessments(
             submission['uuid'], {'peer': {'must_grade': 1, 'must_be_graded_by': 1}}
         )

apps/openassessment/management/tests/test_upload_oa_data.py

@@ -43,7 +43,7 @@ class UploadDataTest(TestCase):
             }
             submission_text = "test submission {}".format(index)
             submission = sub_api.create_submission(student_item, submission_text)
-            workflow_api.create_workflow(submission['uuid'])
+            workflow_api.create_workflow(submission['uuid'], ['peer', 'self'])
 
         # Create and upload the archive of CSV files
         # This should generate the files even though

apps/openassessment/tests/test_data.py

@@ -73,7 +73,7 @@ class CsvWriterTest(CacheResetTest):
             }
             submission_text = "test submission {}".format(index)
             submission = sub_api.create_submission(student_item, submission_text)
-            workflow_api.create_workflow(submission['uuid'])
+            workflow_api.create_workflow(submission['uuid'], ['peer', 'self'])
 
         # Generate a CSV file for the submissions
         output_streams = self._output_streams(['submission'])

apps/openassessment/workflow/admin.py

 from django.contrib import admin
 
-from .models import AssessmentWorkflow
+from .models import AssessmentWorkflow, AssessmentWorkflowStep
+
+
+class AssessmentWorkflowStepInline(admin.StackedInline):
+    model = AssessmentWorkflowStep
+    extra = 0
 
 class AssessmentWorkflowAdmin(admin.ModelAdmin):
     """Admin for the user's overall workflow through open assessment.
@@ -15,5 +20,6 @@ class AssessmentWorkflowAdmin(admin.ModelAdmin):
     )
     list_filter = ('status',)
     search_fields = ('uuid', 'submission_uuid', 'course_id', 'item_id')
+    inlines = (AssessmentWorkflowStepInline,)
 
 admin.site.register(AssessmentWorkflow, AssessmentWorkflowAdmin)

apps/openassessment/workflow/api.py

@@ -9,7 +9,7 @@ from django.db import DatabaseError
 
 from openassessment.assessment import peer_api
 from submissions import api as sub_api
-from .models import AssessmentWorkflow
+from .models import AssessmentWorkflow, AssessmentWorkflowStep
 from .serializers import AssessmentWorkflowSerializer
 
 logger = logging.getLogger(__name__)
@@ -58,7 +58,7 @@ class AssessmentWorkflowNotFoundError(AssessmentWorkflowError):
     pass
 
 
-def create_workflow(submission_uuid):
+def create_workflow(submission_uuid, steps):
     """Begins a new assessment workflow.
 
     Create a new workflow that other assessments will record themselves against.
@@ -66,6 +66,8 @@ def create_workflow(submission_uuid):
     Args:
         submission_uuid (str): The UUID for the submission that all our
             assessments will be evaluating.
+        steps (list): List of steps that are part of the workflow, in the order
+            that the user must complete them. Example: `["peer", "self"]`
 
     Returns:
         dict: Assessment workflow information with the following
@@ -85,7 +87,7 @@ def create_workflow(submission_uuid):
         AssessmentWorkflowRequestError: If the `submission_uuid` passed in does
             not exist or is of an invalid type.
         AssessmentWorkflowInternalError: Unexpected internal error, such as the
-            submissions app not being available or a database configuation
+            submissions app not being available or a database configuration
             problem.
 
     """
@@ -98,7 +100,7 @@ def create_workflow(submission_uuid):
 
     try:
         submission_dict = sub_api.get_submission_and_student(submission_uuid)
-    except sub_api.SubmissionNotFoundError as err:
+    except sub_api.SubmissionNotFoundError:
         err_msg = sub_err_msg("submission not found")
         logger.error(err_msg)
         raise AssessmentWorkflowRequestError(err_msg)
@@ -107,27 +109,51 @@ def create_workflow(submission_uuid):
         logger.error(err_msg)
         raise AssessmentWorkflowRequestError(err_msg)
     except sub_api.SubmissionInternalError as err:
-        err_msg = sub_err_msg(err)
         logger.error(err)
         raise AssessmentWorkflowInternalError(
             u"retrieving submission {} failed with unknown error: {}"
             .format(submission_uuid, err)
         )
 
+    # Raise an error if they specify a step we don't recognize...
+    invalid_steps = set(steps) - set(AssessmentWorkflow.STEPS)
+    if invalid_steps:
+        raise AssessmentWorkflowRequestError(
+            u"The following steps were not recognized: {}; Must be one of {}".format(
+                invalid_steps, AssessmentWorkflow.STEPS
+            )
+        )
+
     # We're not using a serializer to deserialize this because the only variable
     # we're getting from the outside is the submission_uuid, which is already
     # validated by this point.
+    status = AssessmentWorkflow.STATUS.peer
+    if steps[0] == "peer":
+        try:
+            peer_api.create_peer_workflow(submission_uuid)
+        except peer_api.PeerAssessmentError as err:
+            err_msg = u"Could not create assessment workflow: {}".format(err)
+            logger.exception(err_msg)
+            raise AssessmentWorkflowInternalError(err_msg)
+    elif steps[0] == "self":
+        status = AssessmentWorkflow.STATUS.self
+
     try:
-        peer_api.create_peer_workflow(submission_uuid)
         workflow = AssessmentWorkflow.objects.create(
             submission_uuid=submission_uuid,
-            status=AssessmentWorkflow.STATUS.peer,
+            status=status,
             course_id=submission_dict['student_item']['course_id'],
             item_id=submission_dict['student_item']['item_id'],
         )
+        workflow_steps = [
+            AssessmentWorkflowStep(
+                workflow=workflow, name=step, order_num=i
+            )
+            for i, step in enumerate(steps)
+        ]
+        workflow.steps.add(*workflow_steps)
     except (
         DatabaseError,
-        peer_api.PeerAssessmentError,
         sub_api.SubmissionError
     ) as err:
         err_msg = u"Could not create assessment workflow: {}".format(err)
@@ -298,19 +324,20 @@ def update_from_assessments(submission_uuid, assessment_requirements):
     return _serialized_with_details(workflow, assessment_requirements)
 
 
-def get_status_counts(course_id, item_id):
+def get_status_counts(course_id, item_id, steps):
     """
     Count how many workflows have each status, for a given item in a course.
 
     Kwargs:
         course_id (unicode): The ID of the course.
         item_id (unicode): The ID of the item in the course.
+        steps (list): A list of assessment steps for this problem.
 
     Returns:
         list of dictionaries with keys "status" (str) and "count" (int)
 
     Example usage:
-        >>> get_status_counts("ora2/1/1", "peer-assessment-problem")
+        >>> get_status_counts("ora2/1/1", "peer-assessment-problem", ["peer"])
         [
             {"status": "peer", "count": 5},
             {"status": "self", "count": 10},
@@ -327,7 +354,8 @@ def get_status_counts(course_id, item_id):
                 course_id=course_id,
                 item_id=item_id,
             ).count()
-        } for status in AssessmentWorkflow.STATUS_VALUES
+        }
+        for status in steps + AssessmentWorkflow.STATUSES
     ]
 
 

apps/openassessment/workflow/migrations/0002_auto__add_field_assessmentworkflow_course_id__add_field_assessmentwork.py

@@ -40,7 +40,6 @@ class Migration(SchemaMigration):
             'created': ('model_utils.fields.AutoCreatedField', [], {'default': 'datetime.datetime.now'}),
             'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
             'item_id': ('django.db.models.fields.CharField', [], {'max_length': '255', 'db_index': 'True'}),
-            'item_type': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
             'modified': ('model_utils.fields.AutoLastModifiedField', [], {'default': 'datetime.datetime.now'}),
             'status': ('model_utils.fields.StatusField', [], {'default': "'peer'", 'max_length': '100', u'no_check_for_status': 'True'}),
             'status_changed': ('model_utils.fields.MonitorField', [], {'default': 'datetime.datetime.now', u'monitor': "u'status'"}),

apps/openassessment/workflow/migrations/0003_auto__add_assessmentworkflowstep.py

+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Adding model 'AssessmentWorkflowStep'
+        db.create_table('workflow_assessmentworkflowstep', (
+            ('id', self.gf('django.db.models.fields.AutoField')(primary_key=True)),
+            ('workflow', self.gf('django.db.models.fields.related.ForeignKey')(related_name='steps', to=orm['workflow.AssessmentWorkflow'])),
+            ('name', self.gf('django.db.models.fields.CharField')(max_length=20)),
+            ('submitter_completed_at', self.gf('django.db.models.fields.DateTimeField')(default=None, null=True)),
+            ('assessment_completed_at', self.gf('django.db.models.fields.DateTimeField')(default=None, null=True)),
+            ('order_num', self.gf('django.db.models.fields.PositiveIntegerField')()),
+        ))
+        db.send_create_signal('workflow', ['AssessmentWorkflowStep'])
+
+
+    def backwards(self, orm):
+        # Deleting model 'AssessmentWorkflowStep'
+        db.delete_table('workflow_assessmentworkflowstep')
+
+
+    models = {
+        'workflow.assessmentworkflow': {
+            'Meta': {'ordering': "['-created']", 'object_name': 'AssessmentWorkflow'},
+            'course_id': ('django.db.models.fields.CharField', [], {'max_length': '255', 'db_index': 'True'}),
+            'created': ('model_utils.fields.AutoCreatedField', [], {'default': 'datetime.datetime.now'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'item_id': ('django.db.models.fields.CharField', [], {'max_length': '255', 'db_index': 'True'}),
+            'modified': ('model_utils.fields.AutoLastModifiedField', [], {'default': 'datetime.datetime.now'}),
+            'status': ('model_utils.fields.StatusField', [], {'default': "'peer'", 'max_length': '100', u'no_check_for_status': 'True'}),
+            'status_changed': ('model_utils.fields.MonitorField', [], {'default': 'datetime.datetime.now', u'monitor': "u'status'"}),
+            'submission_uuid': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '36', 'db_index': 'True'}),
+            'uuid': ('django.db.models.fields.CharField', [], {'db_index': 'True', 'unique': 'True', 'max_length': '36', 'blank': 'True'})
+        },
+        'workflow.assessmentworkflowstep': {
+            'Meta': {'ordering': "['workflow', 'order_num']", 'object_name': 'AssessmentWorkflowStep'},
+            'assessment_completed_at': ('django.db.models.fields.DateTimeField', [], {'default': 'None', 'null': 'True'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'name': ('django.db.models.fields.CharField', [], {'max_length': '20'}),
+            'order_num': ('django.db.models.fields.PositiveIntegerField', [], {}),
+            'submitter_completed_at': ('django.db.models.fields.DateTimeField', [], {'default': 'None', 'null': 'True'}),
+            'workflow': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'steps'", 'to': "orm['workflow.AssessmentWorkflow']"})
+        }
+    }
+
+    complete_apps = ['workflow']
\ No newline at end of file

apps/openassessment/workflow/test/data/assessments.json

+{
+    "peer": {
+        "steps": ["peer"],
+        "requirements": {
+            "peer": {
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            }
+        }
+    },
+    "both": {
+        "steps": ["peer", "self"],
+        "requirements": {
+            "peer": {
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            },
+            "self": {}
+        }
+    },
+    "self": {
+        "steps": ["self"],
+        "requirements": {
+            "self": {}
+        }
+    }
+}
\ No newline at end of file

apps/openassessment/workflow/test/test_api.py

 from django.db import DatabaseError
-
+import ddt
 from mock import patch
 from nose.tools import raises
+from openassessment.assessment.models import PeerWorkflow
 
 from openassessment.test_utils import CacheResetTest
-from openassessment.assessment import peer_api
 
 from openassessment.workflow.models import AssessmentWorkflow
 from submissions.models import Submission
@@ -18,18 +18,14 @@ ITEM_1 = {
     "item_type": "openassessment",
 }
 
-REQUIREMENTS = {
-    "peer": {
-        "must_grade": 5,
-        "must_be_graded_by": 3,
-    }
-}
-
+@ddt.ddt
 class TestAssessmentWorkflowApi(CacheResetTest):
 
-    def test_create_workflow(self):
+    @ddt.file_data('data/assessments.json')
+    def test_create_workflow(self, data):
+        first_step = data["steps"][0] if data["steps"] else "peer"
         submission = sub_api.create_submission(ITEM_1, "Shoot Hot Rod")
-        workflow = workflow_api.create_workflow(submission["uuid"])
+        workflow = workflow_api.create_workflow(submission["uuid"], data["steps"])
 
         workflow_keys = set(workflow.keys())
         self.assertEqual(
@@ -39,53 +35,73 @@ class TestAssessmentWorkflowApi(CacheResetTest):
             }
         )
         self.assertEqual(workflow["submission_uuid"], submission["uuid"])
-        self.assertEqual(workflow["status"], "peer")
+        self.assertEqual(workflow["status"], first_step)
 
         workflow_from_get = workflow_api.get_workflow_for_submission(
-            submission["uuid"], REQUIREMENTS
+            submission["uuid"], data["requirements"]
         )
         del workflow_from_get['status_details']
         self.assertEqual(workflow, workflow_from_get)
 
-    def test_need_valid_submission_uuid(self):
+    @ddt.file_data('data/assessments.json')
+    def test_need_valid_submission_uuid(self, data):
         # submission doesn't exist
         with self.assertRaises(workflow_api.AssessmentWorkflowRequestError):
-            workflow = workflow_api.create_workflow("xxxxxxxxxxx")
+            workflow = workflow_api.create_workflow("xxxxxxxxxxx", data["steps"])
 
         # submission_uuid is the wrong type
         with self.assertRaises(workflow_api.AssessmentWorkflowRequestError):
-            workflow = workflow_api.create_workflow(123)
+            workflow = workflow_api.create_workflow(123, data["steps"])
 
     @patch.object(Submission.objects, 'get')
+    @ddt.file_data('data/assessments.json')
     @raises(workflow_api.AssessmentWorkflowInternalError)
-    def test_unexpected_submissions_errors_wrapped(self, mock_get):
+    def test_unexpected_submissions_errors_wrapped(self, data, mock_get):
         mock_get.side_effect = Exception("Kaboom!")
-        workflow_api.create_workflow("zzzzzzzzzzzzzzz")
+        workflow_api.create_workflow("zzzzzzzzzzzzzzz", data["steps"])
 
     @patch.object(AssessmentWorkflow.objects, 'create')
+    @ddt.file_data('data/assessments.json')
+    @raises(workflow_api.AssessmentWorkflowInternalError)
+    def test_unexpected_workflow_errors_wrapped(self, data, mock_create):
+        mock_create.side_effect = DatabaseError("Kaboom!")
+        submission = sub_api.create_submission(ITEM_1, "Ultra Magnus fumble")
+        workflow_api.create_workflow(submission["uuid"], data["steps"])
+
+    @patch.object(PeerWorkflow.objects, 'get_or_create')
     @raises(workflow_api.AssessmentWorkflowInternalError)
-    def test_unexpected_workflow_errors_wrapped(self, mock_create):
+    def test_unexpected_peer_workflow_errors_wrapped(self, mock_create):
         mock_create.side_effect = DatabaseError("Kaboom!")
         submission = sub_api.create_submission(ITEM_1, "Ultra Magnus fumble")
-        workflow_api.create_workflow(submission["uuid"])
+        workflow_api.create_workflow(submission["uuid"], ["peer", "self"])
+
+    @patch.object(AssessmentWorkflow.objects, 'get')
+    @ddt.file_data('data/assessments.json')
+    @raises(workflow_api.AssessmentWorkflowInternalError)
+    def test_unexpected_exception_wrapped(self, data, mock_create):
+        mock_create.side_effect = Exception("Kaboom!")
+        submission = sub_api.create_submission(ITEM_1, "Ultra Magnus fumble")
+        workflow_api.update_from_assessments(submission["uuid"], data["steps"])
 
-    def test_get_assessment_workflow_expected_errors(self):
+    @ddt.file_data('data/assessments.json')
+    def test_get_assessment_workflow_expected_errors(self, data):
         with self.assertRaises(workflow_api.AssessmentWorkflowNotFoundError):
-            workflow_api.get_workflow_for_submission("0000000000000", REQUIREMENTS)
+            workflow_api.get_workflow_for_submission("0000000000000", data["requirements"])
         with self.assertRaises(workflow_api.AssessmentWorkflowRequestError):
-            workflow_api.get_workflow_for_submission(123, REQUIREMENTS)
+            workflow_api.get_workflow_for_submission(123, data["requirements"])
 
     @patch.object(Submission.objects, 'get')
+    @ddt.file_data('data/assessments.json')
     @raises(workflow_api.AssessmentWorkflowInternalError)
-    def test_unexpected_workflow_get_errors_wrapped(self, mock_get):
+    def test_unexpected_workflow_get_errors_wrapped(self, data, mock_get):
         mock_get.side_effect = Exception("Kaboom!")
         submission = sub_api.create_submission(ITEM_1, "We talk TV!")
-        workflow = workflow_api.create_workflow(submission["uuid"])
-        workflow_api.get_workflow_for_submission(workflow["uuid"], REQUIREMENTS)
+        workflow = workflow_api.create_workflow(submission["uuid"], data["steps"])
+        workflow_api.get_workflow_for_submission(workflow["uuid"], {})
 
     def test_get_status_counts(self):
         # Initially, the counts should all be zero
-        counts = workflow_api.get_status_counts("test/1/1", "peer-problem")
+        counts = workflow_api.get_status_counts("test/1/1", "peer-problem", ["peer", "self"])
         self.assertEqual(counts, [
             {"status": "peer", "count": 0},
             {"status": "self", "count": 0},
@@ -108,7 +124,7 @@ class TestAssessmentWorkflowApi(CacheResetTest):
         self._create_workflow_with_status("user 10", "test/1/1", "peer-problem", "done")
 
         # Now the counts should be updated
-        counts = workflow_api.get_status_counts("test/1/1", "peer-problem")
+        counts = workflow_api.get_status_counts("test/1/1", "peer-problem", ["peer", "self"])
         self.assertEqual(counts, [
             {"status": "peer", "count": 1},
             {"status": "self", "count": 2},
@@ -119,13 +135,13 @@ class TestAssessmentWorkflowApi(CacheResetTest):
         # Create a workflow in a different course, same user and item
         # Counts should be the same
         self._create_workflow_with_status("user 1", "other_course", "peer-problem", "peer")
-        updated_counts = workflow_api.get_status_counts("test/1/1", "peer-problem")
+        updated_counts = workflow_api.get_status_counts("test/1/1", "peer-problem", ["peer", "self"])
         self.assertEqual(counts, updated_counts)
 
         # Create a workflow in the same course, different item
         # Counts should be the same
         self._create_workflow_with_status("user 1", "test/1/1", "other problem", "peer")
-        updated_counts = workflow_api.get_status_counts("test/1/1", "peer-problem")
+        updated_counts = workflow_api.get_status_counts("test/1/1", "peer-problem", ["peer", "self"])
         self.assertEqual(counts, updated_counts)
 
     def _create_workflow_with_status(self, student_id, course_id, item_id, status, answer="answer"):
@@ -151,7 +167,7 @@ class TestAssessmentWorkflowApi(CacheResetTest):
             "item_type": "openassessment",
         }, answer)
 
-        workflow = workflow_api.create_workflow(submission['uuid'])
+        workflow = workflow_api.create_workflow(submission['uuid'], ["peer", "self"])
         workflow_model = AssessmentWorkflow.objects.get(uuid=workflow['uuid'])
         workflow_model.status = status
         workflow_model.save()

apps/openassessment/xblock/grade_mixin.py

@@ -70,12 +70,26 @@ class GradeMixin(object):
         Returns:
             tuple of context (dict), template_path (string)
         """
-        feedback = peer_api.get_assessment_feedback(self.submission_uuid)
+        # Peer specific stuff...
+        assessment_steps = self.assessment_steps
+        submission_uuid = workflow['submission_uuid']
+
+        if "peer-assessment" in assessment_steps:
+            feedback = peer_api.get_assessment_feedback(submission_uuid)
+            peer_assessments = peer_api.get_assessments(submission_uuid)
+            has_submitted_feedback = feedback is not None
+        else:
+            feedback = None
+            peer_assessments = []
+            has_submitted_feedback = False
+
+        if "self-assessment" in assessment_steps:
+            self_assessment = self_api.get_assessment(submission_uuid)
+        else:
+            self_assessment = None
+
         feedback_text = feedback.get('feedback', '') if feedback else ''
-        student_submission = sub_api.get_submission(workflow['submission_uuid'])
-        peer_assessments = peer_api.get_assessments(student_submission['uuid'])
-        self_assessment = self_api.get_assessment(student_submission['uuid'])
-        has_submitted_feedback = peer_api.get_assessment_feedback(workflow['submission_uuid']) is not None
+        student_submission = sub_api.get_submission(submission_uuid)
 
         # We retrieve the score from the workflow, which in turn retrieves
         # the score for our current submission UUID.
@@ -94,9 +108,14 @@ class GradeMixin(object):
         }
 
         # Update the scores we will display to the user
-        # Note that we are updating a *copy* of the rubric criteria stored in the XBlock field
-        max_scores = peer_api.get_rubric_max_scores(self.submission_uuid)
-        median_scores = peer_api.get_assessment_median_scores(student_submission["uuid"])
+        # Note that we are updating a *copy* of the rubric criteria stored in
+        # the XBlock field
+        max_scores = peer_api.get_rubric_max_scores(submission_uuid)
+        if "peer-assessment" in assessment_steps:
+            median_scores = peer_api.get_assessment_median_scores(submission_uuid)
+        elif "self-assessment" in assessment_steps:
+            median_scores = self_api.get_assessment_scores_by_criteria(submission_uuid)
+
         if median_scores is not None and max_scores is not None:
             for criterion in context["rubric_criteria"]:
                 criterion["median_score"] = median_scores[criterion["name"]]
@@ -114,11 +133,17 @@ class GradeMixin(object):
         Returns:
             tuple of context (dict), template_path (string)
         """
+        def _is_incomplete(step):
+            return (
+                step in workflow["status_details"] and
+                not workflow["status_details"][step]["complete"]
+            )
+
         incomplete_steps = []
-        if not workflow["status_details"]["peer"]["complete"]:
-            incomplete_steps.append("Peer Assessment")
-        if not workflow["status_details"]["self"]["complete"]:
-            incomplete_steps.append("Self Assessment")
+        if _is_incomplete("peer"):
+            incomplete_steps.append(_("Peer Assessment"))
+        if _is_incomplete("self"):
+            incomplete_steps.append(_("Self Assessment"))
 
         return (
             'openassessmentblock/grade/oa_grade_incomplete.html',
@@ -131,7 +156,8 @@ class GradeMixin(object):
         Submit feedback on an assessment.
 
         Args:
-            data (dict): Can provide keys 'feedback_text' (unicode) and 'feedback_options' (list of unicode).
+            data (dict): Can provide keys 'feedback_text' (unicode) and
+                'feedback_options' (list of unicode).
 
         Kwargs:
             suffix (str): Unused

apps/openassessment/xblock/openassessmentblock.py

@@ -2,7 +2,6 @@
 
 import datetime as dt
 import logging
-import dateutil
 import pkg_resources
 
 import pytz
@@ -239,7 +238,9 @@ class OpenAssessmentBlock(
 
         # Include release/due dates for each step in the problem
         context['step_dates'] = list()
-        for step in ['submission', 'peer-assessment', 'self-assessment']:
+
+        steps = ['submission'] + self.assessment_steps
+        for step in steps:
 
             # Get the dates as a student would see them
             __, __, start_date, due_date = self.is_closed(step=step, course_staff=False)
@@ -313,6 +314,10 @@ class OpenAssessmentBlock(
                 load('static/xml/poverty_rubric_example.xml')
             ),
             (
+                "OpenAssessmentBlock (Self Only) Rubric",
+                load('static/xml/poverty_self_only_example.xml')
+            ),
+            (
                 "OpenAssessmentBlock Censorship Rubric",
                 load('static/xml/censorship_rubric_example.xml')
             ),
@@ -333,6 +338,10 @@ class OpenAssessmentBlock(
 
         return update_from_xml(block, node, validator=validator(block, strict_post_release=False))
 
+    @property
+    def assessment_steps(self):
+        return [asmnt['name'] for asmnt in self.rubric_assessments]
+
     def render_assessment(self, path, context_dict=None):
         """Render an Assessment Module's HTML
 
@@ -421,18 +430,17 @@ class OpenAssessmentBlock(
         ]
 
         # Resolve unspecified dates and date strings to datetimes
-        start, due, date_ranges = resolve_dates(self.start, self.due, [submission_range] + assessment_ranges)
+        start, due, date_ranges = resolve_dates(
+            self.start, self.due, [submission_range] + assessment_ranges
+        )
 
-        # Based on the step, choose the date range to consider
-        # We hard-code this to the submission -> peer -> self workflow for now;
-        # later, we can revisit to make this more flexible.
-        open_range = (start, due)
-        if step == "submission":
+        open_range  = (start, due)
+        assessment_steps = self.assessment_steps
+        if step == 'submission':
             open_range = date_ranges[0]
-        if step == "peer-assessment":
-            open_range = date_ranges[1]
-        if step == "self-assessment":
-            open_range = date_ranges[2]
+        elif step in assessment_steps:
+            step_index = assessment_steps.index(step)
+            open_range = date_ranges[1 + step_index]
 
         # Course staff always have access to the problem
         if course_staff is None:

apps/openassessment/xblock/peer_assessment_mixin.py

 import logging
+
 from django.utils.translation import ugettext as _
+from webob import Response
 from xblock.core import XBlock
+
 from openassessment.assessment import peer_api
 from openassessment.assessment.peer_api import (
     PeerAssessmentInternalError, PeerAssessmentRequestError,
@@ -114,6 +117,8 @@ class PeerAssessmentMixin(object):
                 number of assessments.
 
         """
+        if "peer-assessment" not in self.assessment_steps:
+            return Response(u"")
         continue_grading = data.params.get('continue_grading', False)
         path, context_dict = self.peer_path_and_context(continue_grading)
         return self.render_assessment(path, context_dict)

apps/openassessment/xblock/self_assessment_mixin.py

@@ -2,6 +2,8 @@ import logging
 from django.utils.translation import ugettext as _
 
 from xblock.core import XBlock
+from webob import Response
+
 from openassessment.assessment import self_api
 from openassessment.workflow import api as workflow_api
 from submissions import api as submission_api
@@ -24,6 +26,9 @@ class SelfAssessmentMixin(object):
 
     @XBlock.handler
     def render_self_assessment(self, data, suffix=''):
+        if "self-assessment" not in self.assessment_steps:
+            return Response(u"")
+
         try:
             path, context = self.self_path_and_context()
         except:

apps/openassessment/xblock/static/js/fixtures/templates.json

@@ -134,7 +134,59 @@
             "score": "",
             "feedback_text": "",
             "student_submission": "",
-            "peer_assessments": [],
+            "peer_assessments": [
+                {
+                    "submission_uuid": "52d2158a-c568-11e3-b9b9-28cfe9182465",
+                    "points_earned": 5,
+                    "points_possible": 6,
+                    "rubric": {
+                        "criteria": [
+
+                            {
+                                "name": "Criterion 1",
+                                "prompt": "Prompt 1",
+                                "order_num": 0,
+                                "feedback": "optional",
+                                "options": [
+                                    {
+                                        "order_num": 2,
+                                        "points": 2,
+                                        "name": "Good"
+                                    }
+                                ],
+                                "points_possible": 2
+                            },
+                            {
+                                "name": "Criterion 2",
+                                "prompt": "Prompt 2",
+                                "order_num": 1,
+                                "options": [
+                                    {
+                                        "order_num": 1,
+                                        "points": 1,
+                                        "name": "Fair"
+                                    }
+                                ],
+                                "points_possible": 2
+                            },
+                            {
+                                "name": "Criterion 3",
+                                "prompt": "Prompt 3",
+                                "order_num": 2,
+                                "feedback": "optional",
+                                "options": [
+                                    {
+                                        "order_num": 2,
+                                        "points": 2,
+                                        "name": "Good"
+                                    }
+                                ],
+                                "points_possible": 2
+                            }
+                        ]
+                    }
+                }
+            ],
             "self_assessment": {},
             "rubric_criteria": [],
             "has_submitted_feedback": false
@@ -146,4 +198,4 @@
         "context": {},
         "output": "oa_edit.html"
     }
-]
+]
\ No newline at end of file

apps/openassessment/xblock/static/js/spec/oa_peer.js

@@ -26,9 +26,8 @@ describe("OpenAssessment.PeerView", function() {
         this.showLoadError = function(msg) {};
         this.toggleActionError = function(msg, step) {};
         this.setUpCollapseExpand = function(sel) {};
-        this.renderSelfAssessmentStep = function() {};
         this.scrollToTop = function() {};
-        this.gradeView = { load: function() {} };
+        this.loadAssessmentModules = function() {};
     };
 
     // Stubs

apps/openassessment/xblock/static/js/spec/oa_response.js

@@ -27,6 +27,7 @@ describe("OpenAssessment.ResponseView", function() {
 
     // Stub base view
     var StubBaseView = function() {
+        this.loadAssessmentModules = function() {};
         this.peerView = { load: function() {} };
         this.gradeView = { load: function() {} };
         this.showLoadError = function(msg) {};
@@ -221,14 +222,14 @@ describe("OpenAssessment.ResponseView", function() {
             }).promise();
         });
         spyOn(view, 'load');
-        spyOn(baseView.peerView, 'load');
+        spyOn(baseView, 'loadAssessmentModules');
 
         view.response('Test response');
         view.submit();
 
         // Expect the current and next step to have been reloaded
         expect(view.load).toHaveBeenCalled();
-        expect(baseView.peerView.load).toHaveBeenCalled();
+        expect(baseView.loadAssessmentModules).toHaveBeenCalled();
     });
 
     it("enables the unsaved work warning when the user changes the response text", function() {

apps/openassessment/xblock/static/js/src/oa_base.js

@@ -58,13 +58,11 @@ OpenAssessment.BaseView.prototype = {
     },
 
     /**
-     * Asynchronously load each sub-view into the DOM.
-     */
+     Asynchronously load each sub-view into the DOM.
+     **/
     load: function() {
         this.responseView.load();
-        this.peerView.load();
-        this.renderSelfAssessmentStep();
-        this.gradeView.load();
+        this.loadAssessmentModules();
 
         // Set up expand/collapse for course staff debug, if available
         courseStaffDebug = $('.wrapper--staff-info');
@@ -74,6 +72,16 @@ OpenAssessment.BaseView.prototype = {
     },
 
     /**
+     Refresh the Assessment Modules. This should be called any time an action is
+     performed by the user.
+     **/
+    loadAssessmentModules: function() {
+        this.peerView.load();
+        this.renderSelfAssessmentStep();
+        this.gradeView.load();
+    },
+
+    /**
     Render the self-assessment step.
     **/
     renderSelfAssessmentStep: function() {
@@ -158,9 +166,7 @@ OpenAssessment.BaseView.prototype = {
 
         this.server.selfAssess(optionsSelected).done(
             function() {
-                view.peerView.load();
-                view.renderSelfAssessmentStep();
-                view.gradeView.load();
+                view.loadAssessmentModules();
                 view.scrollToTop();
             }
         ).fail(function(errMsg) {
@@ -181,14 +187,14 @@ OpenAssessment.BaseView.prototype = {
     toggleActionError: function(type, msg) {
         var element = this.element;
         var container = null;
-        if (type == 'save') { 
-            container = '.response__submission__actions'; 
+        if (type == 'save') {
+            container = '.response__submission__actions';
         }
-        else if (type == 'submit' || type == 'peer' || type == 'self') { 
-            container = '.step__actions'; 
+        else if (type == 'submit' || type == 'peer' || type == 'self') {
+            container = '.step__actions';
         }
-        else if (type == 'feedback_assess') { 
-            container = '.submission__feedback__actions'; 
+        else if (type == 'feedback_assess') {
+            container = '.submission__feedback__actions';
         }
 
         // If we don't have anywhere to put the message, just log it to the console
@@ -219,10 +225,10 @@ OpenAssessment.BaseView.prototype = {
         $(container + ' .step__status__value .copy').html(gettext('Unable to Load'));
     },
 
-    /** 
+    /**
      * Get the contents of the Step Actions error message box, for unit test validation.
      *
-     * Step Actions are the UX-level parts of the student interaction flow - 
+     * Step Actions are the UX-level parts of the student interaction flow -
      * Submission, Peer Assessment, and Self Assessment. Since steps are mutually
      * exclusive, only one error box should be rendered on screen at a time.
      *

apps/openassessment/xblock/static/js/src/oa_peer.js

@@ -147,8 +147,7 @@ OpenAssessment.PeerView.prototype = {
         var baseView = view.baseView;
         this.peerAssessRequest(function() {
             view.load();
-            baseView.renderSelfAssessmentStep();
-            baseView.gradeView.load();
+            baseView.loadAssessmentModules();
             baseView.scrollToTop();
         });
     },

apps/openassessment/xblock/static/js/src/oa_response.js

@@ -291,8 +291,7 @@ OpenAssessment.ResponseView.prototype = {
     **/
     moveToNextStep: function() {
         this.load();
-        this.baseView.peerView.load();
-        this.baseView.gradeView.load();
+        this.baseView.loadAssessmentModules();
 
         // Disable the "unsaved changes" warning if the user
         // tries to navigate to another page.

apps/openassessment/xblock/static/xml/poverty_self_only_example.xml

+<openassessment submission_due="2015-03-11T18:20">
+    <title>
+        Global Poverty
+    </title>
+    <rubric>
+        <prompt>
+            Given the state of the world today, what do you think should be done to combat poverty?
+
+            Read for conciseness, clarity of thought, and form.
+        </prompt>
+        <criterion>
+            <name>concise</name>
+            <prompt>How concise is it?</prompt>
+            <option points="0">
+                <name>Neal Stephenson (late)</name>
+                <explanation>
+                    In "Cryptonomicon", Stephenson spent multiple pages talking about breakfast cereal.
+                    While hilarious, in recent years his work has been anything but 'concise'.
+                </explanation>
+            </option>
+            <option points="1">
+                <name>HP Lovecraft</name>
+                <explanation>
+                    If the author wrote something cyclopean that staggers the mind, score it thus.
+                </explanation>
+            </option>
+            <option points="3">
+                <name>Robert Heinlein</name>
+                <explanation>
+                    Tight prose that conveys a wealth of information about the world in relatively
+                    few words. Example, "The door irised open and he stepped inside."
+                </explanation>
+            </option>
+            <option points="4">
+                <name>Neal Stephenson (early)</name>
+                <explanation>
+                    When Stephenson still had an editor, his prose was dense, with anecdotes about
+                    nitrox abuse implying main characters' whole life stories.
+                </explanation>
+            </option>
+            <option points="5">
+                <name>Earnest Hemingway</name>
+                <explanation>
+                    Score the work this way if it makes you weep, and the removal of a single
+                    word would make you sneer.
+                </explanation>
+            </option>
+        </criterion>
+        <criterion>
+            <name>clear-headed</name>
+            <prompt>How clear is the thinking?</prompt>
+            <option points="0">
+                <name>Yogi Berra</name>
+                <explanation></explanation>
+            </option>
+            <option points="1">
+                <name>Hunter S. Thompson</name>
+                <explanation></explanation>
+            </option>
+            <option points="2">
+                <name>Robert Heinlein</name>
+                <explanation></explanation>
+            </option>
+            <option points="3">
+                <name>Isaac Asimov</name>
+                <explanation></explanation>
+            </option>
+            <option points="10">
+                <name>Spock</name>
+                <explanation>
+                    Coolly rational, with a firm grasp of the main topics, a crystal-clear train of thought,
+                    and unemotional examination of the facts.  This is the only item explained in this category,
+                    to show that explained and unexplained items can be mixed.
+                </explanation>
+            </option>
+        </criterion>
+        <criterion>
+            <name>form</name>
+            <prompt>Lastly, how is its form? Punctuation, grammar, and spelling all count.</prompt>
+            <option points="0">
+                <name>lolcats</name>
+                <explanation></explanation>
+            </option>
+            <option points="1">
+                <name>Facebook</name>
+                <explanation></explanation>
+            </option>
+            <option points="2">
+                <name>Reddit</name>
+                <explanation></explanation>
+            </option>
+            <option points="3">
+                <name>metafilter</name>
+                <explanation></explanation>
+            </option>
+            <option points="4">
+                <name>Usenet, 1996</name>
+                <explanation></explanation>
+            </option>
+            <option points="5">
+                <name>The Elements of Style</name>
+                <explanation></explanation>
+            </option>
+        </criterion>
+    </rubric>
+    <assessments>
+        <assessment name="self-assessment" />
+    </assessments>
+</openassessment>

apps/openassessment/xblock/submission_mixin.py

@@ -124,7 +124,7 @@ class SubmissionMixin(object):
         student_sub_dict = {'text': student_sub}
 
         submission = api.create_submission(student_item_dict, student_sub_dict)
-        workflow_api.create_workflow(submission["uuid"])
+        self.create_workflow(submission["uuid"])
         self.submission_uuid = submission["uuid"]
 
         # Emit analytics event...

apps/openassessment/xblock/test/data/assessment_combo.json

@@ -10,7 +10,9 @@
             {
                 "name": "self-assessment"
             }
-        ]
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "peer_only": {
         "valid": false,
@@ -20,15 +22,19 @@
                 "must_grade": 5,
                 "must_be_graded_by": 3
             }
-        ]
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "self_only": {
-        "valid": false,
+        "valid": true,
         "assessments": [
             {
                 "name": "self-assessment"
             }
-        ]
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "self_before_peer": {
         "valid": false,
@@ -41,7 +47,9 @@
                 "must_grade": 5,
                 "must_be_graded_by": 3
             }
-        ]
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "peer_then_peer": {
         "valid": false,
@@ -56,6 +64,8 @@
                 "must_grade": 5,
                 "must_be_graded_by": 3
             }
-        ]
+        ],
+        "current_assessments": null,
+        "is_released": false
     }
 }

apps/openassessment/xblock/test/data/invalid_assessment_combo_order.xml

+<openassessment>
+    <title>Open Assessment Test</title>
+    <prompt>
+        Given the state of the world today, what do you think should be done to
+        combat poverty? Please answer in a short essay of 200-300 words.
+    </prompt>
+    <rubric>
+        <prompt>Read for conciseness, clarity of thought, and form.</prompt>
+        <criterion>
+            <name>Concise</name>
+            <prompt>How concise is it?</prompt>
+            <option points="0">
+                <name>Neal Stephenson (late)</name>
+                <explanation>Neal Stephenson explanation</explanation>
+            </option>
+        </criterion>
+    </rubric>
+    <assessments>
+        <assessment name="self-assessment" />
+        <assessment name="peer-assessment" />
+    </assessments>
+</openassessment>

apps/openassessment/xblock/test/data/invalid_assessment_combo_peer_only.xml

+<openassessment>
+    <title>Open Assessment Test</title>
+    <prompt>
+        Given the state of the world today, what do you think should be done to
+        combat poverty? Please answer in a short essay of 200-300 words.
+    </prompt>
+    <rubric>
+        <prompt>Read for conciseness, clarity of thought, and form.</prompt>
+        <criterion>
+            <name>Concise</name>
+            <prompt>How concise is it?</prompt>
+            <option points="0">
+                <name>Neal Stephenson (late)</name>
+                <explanation>Neal Stephenson explanation</explanation>
+            </option>
+        </criterion>
+    </rubric>
+    <assessments>
+        <assessment name="peer-assessment" />
+    </assessments>
+</openassessment>

apps/openassessment/xblock/test/data/invalid_assessments.json

 {
     "empty_dict": {
-        "assessment": {}
-     },
-    "must_be_graded_by_zero": {
-        "assessment": {
-            "name": "self-assessment",
-            "must_grade": 1,
-            "must_be_graded_by": 0
-        }
+        "assessments": [{}],
+        "current_assessments": null,
+        "is_released": false
     },
     "unsupported_type": {
-        "assessment": {
-            "name": "unsupported-assessment",
-            "must_grade": 5,
-            "must_be_graded_by": 3
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            },
+            {
+                "name": "self-assessment"
+            },
+            {
+                "name": "unsupported-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "no_type": {
-        "assessment": {
-            "must_grade": 5,
-            "must_be_graded_by": 3
-        }
+        "assessments": [
+            {
+                "name": "self-assessment"
+            },
+            {
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "unsupported_unicode_type": {
-        "assessment": {
-            "name": "𝓹𝓮𝓮𝓻-𝓪𝓼𝓼𝓮𝓼𝓼𝓶𝓮𝓷𝓽",
-            "must_grade": 5,
-            "must_be_graded_by": 3
-        }
+        "assessments": [
+            {
+                "name": "self-assessment"
+            },
+            {
+                "name": "𝓹𝓮𝓮𝓻-𝓪𝓼𝓼𝓮𝓼𝓼𝓶𝓮𝓷𝓽",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "no_must_grade": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_be_graded_by": 3
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_be_graded_by": 3
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "no_must_be_graded_by": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_grade": 5
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 5
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "must_grade_less_than_must_be_graded_by": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_grade": 4,
-            "must_be_graded_by": 5
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 4,
+                "must_be_graded_by": 5
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "must_grade_zero": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_grade": 0,
-            "must_be_graded_by": 0
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 0,
+                "must_be_graded_by": 0
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "must_be_graded_by_zero": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_grade": 1,
-            "must_be_graded_by": 0
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 1,
+                "must_be_graded_by": 0
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
+    },
+    "remove_peer_mid_flight": {
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": [
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "is_released": true
+    },
+    "swap_peer_and_self_mid_flight": {
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": [
+            {
+                "name": "self-assessment"
+            },
+            {
+                "name": "peer-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            }
+        ],
+        "is_released": true
     }
 }

apps/openassessment/xblock/test/data/invalid_assessment_combo.xml → apps/openassessment/xblock/test/data/optional_assessments_self_only.xml

 <openassessment>
-    <title>Open Assessment Test</title>
+    <title>Only Self Assessment</title>
     <prompt>
         Given the state of the world today, what do you think should be done to
         combat poverty? Please answer in a short essay of 200-300 words.

apps/openassessment/xblock/test/data/valid_assessments.json

 {
-    "peer": {
-        "assessment": {
-            "name": "peer-assessment",
-            "must_grade": 5,
-            "must_be_graded_by": 3
-        }
+    "peer_then_self": {
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 5,
+                "must_be_graded_by": 3
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
-    "self": {
-        "assessment": {
-            "name": "self-assessment",
-            "must_grade": 2,
-            "must_be_graded_by": 1
-        }
+    "self_only": {
+        "assessments": [
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     },
     "must_be_graded_by_equals_must_grade": {
-        "assessment": {
-            "name": "self-assessment",
-            "must_grade": 1,
-            "must_be_graded_by": 1
-        }
+        "assessments": [
+            {
+                "name": "peer-assessment",
+                "must_grade": 1,
+                "must_be_graded_by": 1
+            },
+            {
+                "name": "self-assessment"
+            }
+        ],
+        "current_assessments": null,
+        "is_released": false
     }
 }

apps/openassessment/xblock/test/test_grade.py

@@ -37,6 +37,8 @@ class TestGrade(XBlockHandlerTestCase):
 
     SUBMISSION = u'ՇﻉรՇ รપ๒๓ٱรรٱѻก'
 
+    STEPS = ['peer', 'self']
+
     @scenario('data/grade_scenario.xml', user_id='Greggs')
     def test_render_grade(self, xblock):
         # Submit, assess, and render the grade view
@@ -224,7 +226,7 @@ class TestGrade(XBlockHandlerTestCase):
             scorer['student_id'] = scorer_name
 
             scorer_sub = sub_api.create_submission(scorer, {'text': submission_text})
-            workflow_api.create_workflow(scorer_sub['uuid'])
+            workflow_api.create_workflow(scorer_sub['uuid'], self.STEPS)
 
             submission = peer_api.get_submission_to_assess(scorer_sub['uuid'], len(peers))
 

apps/openassessment/xblock/test/test_studio.py

@@ -92,12 +92,15 @@ class StudioViewTest(XBlockHandlerTestCase):
     # Test that we enforce that there are exactly two assessments,
     # peer ==> self
     # If and when we remove this restriction, this test can be deleted.
+    @data('data/invalid_assessment_combo_order.xml', 'data/invalid_assessment_combo_peer_only.xml')
     @scenario('data/basic_scenario.xml')
-    def test_update_xml_invalid_assessment_combo(self, xblock):
-        request = json.dumps({'xml': self.load_fixture_str('data/invalid_assessment_combo.xml')})
+    def test_update_xml_invalid_assessment_combo(self, xblock, invalid_workflow):
+        request = json.dumps(
+            {'xml': self.load_fixture_str(invalid_workflow)}
+        )
         resp = self.request(xblock, 'update_xml', request, response_format='json')
         self.assertFalse(resp['success'])
-        self.assertIn("must have exactly two assessments", resp['msg'].lower())
+        self.assertIn("for this assignment", resp['msg'].lower())
 
     @data(('data/invalid_rubric.xml', 'rubric'), ('data/invalid_assessment.xml', 'assessment'))
     @scenario('data/basic_scenario.xml')

apps/openassessment/xblock/test/test_validation.py

@@ -14,27 +14,26 @@ class AssessmentValidationTest(TestCase):
 
     @ddt.file_data('data/valid_assessments.json')
     def test_valid_assessment(self, data):
-        success, msg = validate_assessments([data['assessment']])
+        success, msg = validate_assessments(data["assessments"], data["current_assessments"], data["is_released"])
         self.assertTrue(success)
         self.assertEqual(msg, u'')
 
     @ddt.file_data('data/invalid_assessments.json')
     def test_invalid_assessment(self, data):
-        success, msg = validate_assessments([data['assessment']])
+        success, msg = validate_assessments(data["assessments"], data["current_assessments"], data["is_released"])
         self.assertFalse(success)
         self.assertGreater(len(msg), 0)
 
     def test_no_assessments(self):
-        success, msg = validate_assessments([])
+        success, msg = validate_assessments([], [], False)
         self.assertFalse(success)
         self.assertGreater(len(msg), 0)
 
-    # Currently, we enforce the restriction that there must be
-    # exactly two assessments, in the order (a) peer, then (b) self.
-    # If and when we remove that restriction, this test can be deleted.
+    # Make sure only legal assessment combinations are allowed. For now, that's
+    # (peer -> self), and (self)
     @ddt.file_data('data/assessment_combo.json')
-    def test_enforce_peer_then_self(self, data):
-        success, msg = validate_assessments(data['assessments'], enforce_peer_then_self=True)
+    def test_enforce_assessment_combo_restrictions(self, data):
+        success, msg = validate_assessments(data["assessments"], data["current_assessments"], data["is_released"])
         self.assertEqual(success, data['valid'], msg=msg)
 
         if not success:

apps/openassessment/xblock/validation.py

@@ -43,33 +43,49 @@ def _duplicates(items):
     return set(x for x in items if counts[x] > 1)
 
 
-def validate_assessments(assessments, enforce_peer_then_self=False):
+def validate_assessments(assessments, current_assessments, is_released):
     """
     Check that the assessment dict is semantically valid.
 
+    Valid assessment steps are currently:
+    * peer, then self
+    * self only
+
+    If a question has been released, the type and number of assessment steps
+    cannot be changed.
+
     Args:
         assessments (list of dict): list of serialized assessment models.
-
-    Kwargs:
-        enforce_peer_then_self (bool): If True, enforce the requirement that there
-            must be exactly two assessments: first, a peer-assessment, then a self-assessment.
+        current_assessments (list of dict): list of the current serialized
+            assessment models. Used to determine if the assessment configuration
+            has changed since the question had been released.
+        is_released (boolean) : True if the question has been released.
 
     Returns:
         tuple (is_valid, msg) where
             is_valid is a boolean indicating whether the assessment is semantically valid
             and msg describes any validation errors found.
     """
-    if enforce_peer_then_self:
-        if len(assessments) != 2:
-            return (False, _("This problem must have exactly two assessments."))
-        if assessments[0].get('name') != 'peer-assessment':
-            return (False, _("The first assessment must be a peer assessment."))
-        if assessments[1].get('name') != 'self-assessment':
-            return (False, _("The second assessment must be a self assessment."))
+    def _self_only(assessments):
+        return len(assessments) == 1 and assessments[0].get('name') == 'self-assessment'
+
+    def _peer_then_self(assessments):
+        return (
+            len(assessments) == 2 and
+            assessments[0].get('name') == 'peer-assessment' and
+            assessments[1].get('name') == 'self-assessment'
+        )
 
     if len(assessments) == 0:
         return (False, _("This problem must include at least one assessment."))
 
+    # Right now, there are two allowed scenarios: (peer -> self) and (self)
+    if not (_self_only(assessments) or _peer_then_self(assessments)):
+        return (
+            False,
+            _("For this assignment, you can set either a peer assessment followed by a self assessment or a self assessment only.")
+        )
+
     for assessment_dict in assessments:
         # Supported assessment
         if not assessment_dict.get('name') in ['peer-assessment', 'self-assessment']:
@@ -89,6 +105,15 @@ def validate_assessments(assessments, enforce_peer_then_self=False):
             if must_grade < must_be_graded_by:
                 return (False, _('The "must_grade" value must be greater than or equal to the "must_be_graded_by" value.'))
 
+    if is_released:
+        if len(assessments) != len(current_assessments):
+            return (False, _("The number of assessments cannot be changed after the problem has been released."))
+
+        names = [assessment.get('name') for assessment in assessments]
+        current_names = [assessment.get('name') for assessment in current_assessments]
+        if names != current_names:
+            return (False, _("The assessment type cannot be changed after the problem has been released."))
+
     return (True, u'')
 
 
@@ -188,7 +213,12 @@ def validator(oa_block, strict_post_release=True):
     """
 
     def _inner(rubric_dict, submission_dict, assessments):
-        success, msg = validate_assessments(assessments, enforce_peer_then_self=True)
+        current_assessments = oa_block.rubric_assessments
+        success, msg = validate_assessments(
+            assessments,
+            current_assessments,
+            strict_post_release and oa_block.is_released()
+        )
         if not success:
             return (False, msg)
 

apps/openassessment/xblock/workflow_mixin.py

@@ -8,6 +8,25 @@ class WorkflowMixin(object):
     def handle_workflow_info(self, data, suffix=''):
         return self.get_workflow_info()
 
+    def create_workflow(self, submission_uuid):
+        steps = self._create_step_list()
+        workflow_api.create_workflow(submission_uuid, steps)
+
+    def _create_step_list(self):
+        def _convert_rubric_assessment_name(ra_name):
+            """'self-assessment' -> 'self', 'peer-assessment' -> 'peer'"""
+            short_name, suffix = ra_name.split("-")
+            return short_name
+
+        # rubric_assessments stores names as "self-assessment",
+        # "peer-assessment", while the model is expecting "self", "peer".
+        # Therefore, this conversion step. We should refactor later to
+        # standardize.
+        return [
+            _convert_rubric_assessment_name(ra["name"])
+            for ra in self.rubric_assessments
+        ]
+
     def workflow_requirements(self):
         """
         Retrieve the requirements from each assessment module
@@ -93,6 +112,7 @@ class WorkflowMixin(object):
         status_counts = workflow_api.get_status_counts(
             course_id=student_item['course_id'],
             item_id=student_item['item_id'],
+            steps=self._create_step_list(),
         )
         num_submissions = sum(item['count'] for item in status_counts)
         return status_counts, num_submissions