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:
# This will always create a list of length 1
assessments = list(
Assessment.objects.filter(
score_type=SELF_TYPE,
submission_uuid=submission_uuid).order_by('-scored_at')[:1])
scores = Assessment.scores_by_criterion(assessments)
# Since this is only being sent one score, the median score will be the
# same as the only score.
return Assessment.get_median_score_dict(scores)
except DatabaseError:
error_message = (
u"Error getting self assessment scores for submission {}"
).format(submission_uuid)
logger.exception(error_message)
raise SelfAssessmentInternalError(error_message)
def create_assessment(submission_uuid,
user_id,
options_selected,
criterion_feedback,
overall_feedback,
rubric_dict,
scored_at=None):
"""
Create a self-assessment for a submission.
Args:
submission_uuid (str): The unique identifier for the submission being assessed.
user_id (str): The ID of the user creating the assessment.
This must match the ID of the user who made the submission.
options_selected (dict): Mapping of rubric criterion names to option values selected.
criterion_feedback (dict): Dictionary mapping criterion names to the
free-form text feedback the user gave for the criterion.
Since criterion feedback is optional, some criteria may not appear
in the dictionary.
overall_feedback (unicode): Free-form text feedback on the submission overall.
rubric_dict (dict): Serialized Rubric model.
Keyword Arguments:
scored_at (datetime): The timestamp of the assessment; defaults to the current time.
Returns:
dict: serialized Assessment model
Raises:
SelfAssessmentRequestError: Could not retrieve a submission that the user is allowed to score.
"""
# Check that there are not any assessments for this submission
if Assessment.objects.filter(submission_uuid=submission_uuid,
score_type=SELF_TYPE).exists():
msg = (
u"Cannot submit a self-assessment for the submission {uuid} "
"because another self-assessment already exists for that submission."
).format(uuid=submission_uuid)
raise SelfAssessmentRequestError(msg)
# Check that the student is allowed to assess this submission
try:
submission = get_submission_and_student(submission_uuid)
if submission['student_item']['student_id'] != user_id:
msg = (
u"Cannot submit a self-assessment for the submission {uuid} "
u"because it was created by another learner "
u"(submission learner ID {student_id} does not match your "
u"learner id {other_id})").format(
uuid=submission_uuid,
student_id=submission['student_item']['student_id'],
other_id=user_id)
raise SelfAssessmentRequestError(msg)
except SubmissionNotFoundError:
msg = ("Could not submit a self-assessment because no submission "
"exists with UUID {uuid}").format(uuid=submission_uuid)
raise SelfAssessmentRequestError()
try:
assessment = _complete_assessment(submission_uuid, user_id,
options_selected, criterion_feedback,
overall_feedback, rubric_dict,
scored_at)
_log_assessment(assessment, submission)
except InvalidRubric as ex:
msg = "Invalid rubric definition: " + str(ex)
logger.warning(msg, exc_info=True)
raise SelfAssessmentRequestError(msg)
except InvalidRubricSelection as ex:
msg = "Selected options do not match the rubric: " + str(ex)
logger.warning(msg, exc_info=True)
raise SelfAssessmentRequestError(msg)
except DatabaseError:
error_message = (u"Error creating self assessment for submission {}"
).format(submission_uuid)
logger.exception(error_message)
raise SelfAssessmentInternalError(error_message)
# Return the serialized assessment
return full_assessment_dict(assessment)
