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Merge pull request #1655 from edx/adam/more-granular-grading-transactions

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Adam/more granular grading transactions
This commit is contained in:
Jim Abramson
2013-11-13 11:01:46 -08:00
parent 2261d4c421 19dd49f355
commit c8dc27820f
3 changed files with 174 additions and 126 deletions
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199
lms/djangoapps/courseware/grades.py
View File

@@ -4,9 +4,11 @@ from __future__ import division
import random
import logging
from contextlib import contextmanager
from collections import defaultdict
from django.conf import settings
from django.contrib.auth.models import User
from django.db import transaction
from courseware.model_data import FieldDataCache, DjangoKeyValueStore
from xblock.fields import Scope
@@ -121,8 +123,20 @@ def answer_distributions(request, course):
return counts
def grade(student, request, course, field_data_cache=None, keep_raw_scores=False):
@transaction.commit_manually
def grade(student, request, course, keep_raw_scores=False):
"""
Wraps "_grade" with the manual_transaction context manager just in case
there are unanticipated errors.
"""
with manual_transaction():
return _grade(student, request, course, keep_raw_scores)
def _grade(student, request, course, keep_raw_scores):
"""
Unwrapped version of "grade"
This grades a student as quickly as possible. It returns the
output from the course grader, augmented with the final letter
grade. The keys in the output are:
@@ -132,20 +146,17 @@ def grade(student, request, course, field_data_cache=None, keep_raw_scores=False
- grade : A final letter grade.
- percent : The final percent for the class (rounded up).
- section_breakdown : A breakdown of each section that makes
up the grade. (For display)
up the grade. (For display)
- grade_breakdown : A breakdown of the major components that
make up the final grade. (For display)
- keep_raw_scores : if True, then value for key 'raw_scores' contains scores for every graded module
make up the final grade. (For display)
- keep_raw_scores : if True, then value for key 'raw_scores' contains scores
for every graded module
More information on the format is in the docstring for CourseGrader.
"""
grading_context = course.grading_context
raw_scores = []
if field_data_cache is None:
field_data_cache = FieldDataCache(grading_context['all_descriptors'], course.id, student)
totaled_scores = {}
# This next complicated loop is just to collect the totaled_scores, which is
# passed to the grader
@@ -155,26 +166,22 @@ def grade(student, request, course, field_data_cache=None, keep_raw_scores=False
section_descriptor = section['section_descriptor']
section_name = section_descriptor.display_name_with_default
should_grade_section = False
# some problems have state that is updated independently of interaction
# with the LMS, so they need to always be scored. (E.g. foldit.)
should_grade_section = any(
descriptor.always_recalculate_grades for descriptor in section['xmoduledescriptors']
)
# If we haven't seen a single problem in the section, we don't have to grade it at all! We can assume 0%
for moduledescriptor in section['xmoduledescriptors']:
# some problems have state that is updated independently of interaction
# with the LMS, so they need to always be scored. (E.g. foldit.)
if moduledescriptor.always_recalculate_grades:
should_grade_section = True
break
# Create a fake key to pull out a StudentModule object from the FieldDataCache
key = DjangoKeyValueStore.Key(
Scope.user_state,
student.id,
moduledescriptor.location,
None
)
if field_data_cache.find(key):
should_grade_section = True
break
if not should_grade_section:
with manual_transaction():
should_grade_section = StudentModule.objects.filter(
student=student,
module_type='problem',
module_state_key__in=[
descriptor.location for descriptor in section['xmoduledescriptors']
]
).exists()
if should_grade_section:
scores = []
@@ -183,11 +190,13 @@ def grade(student, request, course, field_data_cache=None, keep_raw_scores=False
'''creates an XModule instance given a descriptor'''
# TODO: We need the request to pass into here. If we could forego that, our arguments
# would be simpler
with manual_transaction():
field_data_cache = FieldDataCache([descriptor], course.id, student)
return get_module_for_descriptor(student, request, descriptor, field_data_cache, course.id)
for module_descriptor in yield_dynamic_descriptor_descendents(section_descriptor, create_module):
(correct, total) = get_score(course.id, student, module_descriptor, create_module, field_data_cache)
(correct, total) = get_score(course.id, student, module_descriptor, create_module)
if correct is None and total is None:
continue
@@ -256,11 +265,23 @@ def grade_for_percentage(grade_cutoffs, percentage):
return letter_grade
@transaction.commit_manually
def progress_summary(student, request, course):
"""
Wraps "_progress_summary" with the manual_transaction context manager just
in case there are unanticipated errors.
"""
with manual_transaction():
return _progress_summary(student, request, course)
# TODO: This method is not very good. It was written in the old course style and
# then converted over and performance is not good. Once the progress page is redesigned
# to not have the progress summary this method should be deleted (so it won't be copied).
def progress_summary(student, request, course, field_data_cache):
def _progress_summary(student, request, course):
"""
Unwrapped version of "progress_summary".
This pulls a summary of all problems in the course.
Returns
@@ -273,20 +294,21 @@ def progress_summary(student, request, course, field_data_cache):
Arguments:
student: A User object for the student to grade
course: A Descriptor containing the course to grade
field_data_cache: A FieldDataCache initialized with all
instance_modules for the student
If the student does not have access to load the course module, this function
will return None.
"""
# TODO: We need the request to pass into here. If we could forego that, our arguments
# would be simpler
course_module = get_module_for_descriptor(student, request, course, field_data_cache, course.id)
if not course_module:
# This student must not have access to the course.
return None
with manual_transaction():
field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
course.id, student, course, depth=None
)
# TODO: We need the request to pass into here. If we could
# forego that, our arguments would be simpler
course_module = get_module_for_descriptor(student, request, course, field_data_cache, course.id)
if not course_module:
# This student must not have access to the course.
return None
chapters = []
# Don't include chapters that aren't displayable (e.g. due to error)
@@ -296,50 +318,52 @@ def progress_summary(student, request, course, field_data_cache):
continue
sections = []
for section_module in chapter_module.get_display_items():
# Skip if the section is hidden
if section_module.hide_from_toc:
continue
# Same for sections
graded = section_module.graded
scores = []
module_creator = section_module.xmodule_runtime.get_module
for module_descriptor in yield_dynamic_descriptor_descendents(section_module, module_creator):
course_id = course.id
(correct, total) = get_score(course_id, student, module_descriptor, module_creator, field_data_cache)
if correct is None and total is None:
with manual_transaction():
if section_module.hide_from_toc:
continue
scores.append(Score(correct, total, graded, module_descriptor.display_name_with_default))
graded = section_module.graded
scores = []
scores.reverse()
section_total, _ = graders.aggregate_scores(
scores, section_module.display_name_with_default)
module_creator = section_module.xmodule_runtime.get_module
module_format = section_module.format if section_module.format is not None else ''
sections.append({
'display_name': section_module.display_name_with_default,
'url_name': section_module.url_name,
'scores': scores,
'section_total': section_total,
'format': module_format,
'due': section_module.due,
'graded': graded,
})
for module_descriptor in yield_dynamic_descriptor_descendents(section_module, module_creator):
chapters.append({'course': course.display_name_with_default,
'display_name': chapter_module.display_name_with_default,
'url_name': chapter_module.url_name,
'sections': sections})
course_id = course.id
(correct, total) = get_score(course_id, student, module_descriptor, module_creator)
if correct is None and total is None:
continue
scores.append(Score(correct, total, graded, module_descriptor.display_name_with_default))
scores.reverse()
section_total, _ = graders.aggregate_scores(
scores, section_module.display_name_with_default)
module_format = section_module.format if section_module.format is not None else ''
sections.append({
'display_name': section_module.display_name_with_default,
'url_name': section_module.url_name,
'scores': scores,
'section_total': section_total,
'format': module_format,
'due': section_module.due,
'graded': graded,
})
chapters.append({
'course': course.display_name_with_default,
'display_name': chapter_module.display_name_with_default,
'url_name': chapter_module.url_name,
'sections': sections
})
return chapters
def get_score(course_id, user, problem_descriptor, module_creator, field_data_cache):
def get_score(course_id, user, problem_descriptor, module_creator):
"""
Return the score for a user on a problem, as a tuple (correct, total).
e.g. (5,7) if you got 5 out of 7 points.
@@ -372,15 +396,15 @@ def get_score(course_id, user, problem_descriptor, module_creator, field_data_ca
# These are not problems, and do not have a score
return (None, None)
# Create a fake KeyValueStore key to pull out the StudentModule
key = DjangoKeyValueStore.Key(
Scope.user_state,
user.id,
problem_descriptor.location,
None
)
student_module = field_data_cache.find(key)
try:
student_module = StudentModule.objects.get(
student=user,
course_id=course_id,
module_type='problem',
module_state_key=problem_descriptor.location
)
except StudentModule.DoesNotExist:
student_module = None
if student_module is not None and student_module.max_grade is not None:
correct = student_module.grade if student_module.grade is not None else 0
@@ -411,3 +435,16 @@ def get_score(course_id, user, problem_descriptor, module_creator, field_data_ca
total = weight
return (correct, total)
@contextmanager
def manual_transaction():
"""A context manager for managing manual transactions"""
try:
yield
except Exception:
transaction.rollback()
log.exception('Due to an error, this transaction has been rolled back')
raise
else:
transaction.commit()

26
lms/djangoapps/courseware/tests/test_submitting_problems.py
View File

@@ -236,14 +236,11 @@ class TestCourseGrader(TestSubmittingProblems):
make up the final grade. (For display)
"""
field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
self.course.id, self.student_user, self.course)
fake_request = self.factory.get(
reverse('progress', kwargs={'course_id': self.course.id})
)
fake_request = self.factory.get(reverse('progress',
kwargs={'course_id': self.course.id}))
return grades.grade(self.student_user, fake_request,
self.course, field_data_cache)
return grades.grade(self.student_user, fake_request, self.course)
def get_progress_summary(self):
"""
@@ -257,16 +254,13 @@ class TestCourseGrader(TestSubmittingProblems):
etc.
"""
field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
self.course.id, self.student_user, self.course)
fake_request = self.factory.get(
reverse('progress', kwargs={'course_id': self.course.id})
)
fake_request = self.factory.get(reverse('progress',
kwargs={'course_id': self.course.id}))
progress_summary = grades.progress_summary(self.student_user,
fake_request,
self.course,
field_data_cache)
progress_summary = grades.progress_summary(
self.student_user, fake_request, self.course
)
return progress_summary
def check_grade_percent(self, percent):

75
lms/djangoapps/courseware/views.py
View File

@@ -14,6 +14,7 @@ from django.shortcuts import redirect
from mitxmako.shortcuts import render_to_response, render_to_string
from django_future.csrf import ensure_csrf_cookie
from django.views.decorators.cache import cache_control
from django.db import transaction
from markupsafe import escape
from courseware import grades
@@ -643,8 +644,9 @@ def mktg_course_about(request, course_id):
except (ValueError, Http404) as e:
# if a course does not exist yet, display a coming
# soon button
return render_to_response('courseware/mktg_coming_soon.html',
{'course_id': course_id})
return render_to_response(
'courseware/mktg_coming_soon.html', {'course_id': course_id}
)
registered = registered_for_course(course, request.user)
@@ -659,21 +661,36 @@ def mktg_course_about(request, course_id):
settings.MITX_FEATURES.get('ENABLE_LMS_MIGRATION'))
course_modes = CourseMode.modes_for_course(course.id)
return render_to_response('courseware/mktg_course_about.html',
{
'course': course,
'registered': registered,
'allow_registration': allow_registration,
'course_target': course_target,
'show_courseware_link': show_courseware_link,
'course_modes': course_modes,
})
return render_to_response(
'courseware/mktg_course_about.html',
{
'course': course,
'registered': registered,
'allow_registration': allow_registration,
'course_target': course_target,
'show_courseware_link': show_courseware_link,
'course_modes': course_modes,
}
)
@login_required
@cache_control(no_cache=True, no_store=True, must_revalidate=True)
@transaction.commit_manually
def progress(request, course_id, student_id=None):
""" User progress. We show the grade bar and every problem score.
"""
Wraps "_progress" with the manual_transaction context manager just in case
there are unanticipated errors.
"""
with grades.manual_transaction():
return _progress(request, course_id, student_id)
def _progress(request, course_id, student_id):
"""
Unwrapped version of "progress".
User progress. We show the grade bar and every problem score.
Course staff are allowed to see the progress of students in their class.
"""
@@ -689,33 +706,33 @@ def progress(request, course_id, student_id=None):
raise Http404
student = User.objects.get(id=int(student_id))
# NOTE: To make sure impersonation by instructor works, use
# student instead of request.user in the rest of the function.
# NOTE: To make sure impersonation by instructor works, use
# student instead of request.user in the rest of the function.
# The pre-fetching of groups is done to make auth checks not require an
# additional DB lookup (this kills the Progress page in particular).
# The pre-fetching of groups is done to make auth checks not require an
# additional DB lookup (this kills the Progress page in particular).
student = User.objects.prefetch_related("groups").get(id=student.id)
field_data_cache = FieldDataCache.cache_for_descriptor_descendents(
course_id, student, course, depth=None)
courseware_summary = grades.progress_summary(student, request, course)
courseware_summary = grades.progress_summary(student, request, course,
field_data_cache)
grade_summary = grades.grade(student, request, course, field_data_cache)
grade_summary = grades.grade(student, request, course)
if courseware_summary is None:
#This means the student didn't have access to the course (which the instructor requested)
raise Http404
context = {'course': course,
'courseware_summary': courseware_summary,
'grade_summary': grade_summary,
'staff_access': staff_access,
'student': student,
}
context.update()
context = {
'course': course,
'courseware_summary': courseware_summary,
'grade_summary': grade_summary,
'staff_access': staff_access,
'student': student,
}
return render_to_response('courseware/progress.html', context)
with grades.manual_transaction():
response = render_to_response('courseware/progress.html', context)
return response
@login_required