# -*- coding: utf-8 -*- from __future__ import division __copyright__ = "Copyright (C) 2014 Andreas Kloeckner" __license__ = """ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ from django.shortcuts import ( # noqa render, get_object_or_404, redirect) from django.contrib import messages from django.core.exceptions import ( PermissionDenied, SuspiciousOperation, ObjectDoesNotExist) from django.db import transaction from django.utils.safestring import mark_safe from django import forms from django import http from relate.utils import StyledForm, local_now, as_local_time from crispy_forms.layout import Submit from course.constants import ( flow_permission, participation_role, flow_session_expiration_mode, FLOW_SESSION_EXPIRATION_MODE_CHOICES, is_expiration_mode_allowed, flow_rule_kind, grade_aggregation_strategy, GRADE_AGGREGATION_STRATEGY_CHOICES ) from course.models import ( FlowSession, FlowPageData, FlowPageVisit, FlowPageVisitGrade, get_feedback_for_grade, GradeChange, update_bulk_feedback) from course.utils import ( FlowContext, FlowPageContext, instantiate_flow_page_with_ctx, course_view, render_course_page, get_session_start_rule, get_session_access_rule, get_session_grading_rule, FlowSessionGradingRule) from course.views import get_now_or_fake_time # {{{ grade page visit def grade_page_visit(visit, visit_grade_model=FlowPageVisitGrade, grade_data=None, graded_at_git_commit_sha=None): if not visit.is_submitted_answer: raise RuntimeError("cannot grade ungraded answer") flow_session = visit.flow_session course = flow_session.course page_data = visit.page_data most_recent_grade = visit.get_most_recent_grade() if most_recent_grade is not None and grade_data is None: grade_data = most_recent_grade.grade_data from course.content import ( get_course_repo, get_course_commit_sha, get_flow_desc, get_flow_page_desc, instantiate_flow_page) repo = get_course_repo(course) course_commit_sha = get_course_commit_sha( course, flow_session.participation) flow_desc = get_flow_desc(repo, course, flow_session.flow_id, course_commit_sha) page_desc = get_flow_page_desc( flow_session.flow_id, flow_desc, page_data.group_id, page_data.page_id) page = instantiate_flow_page( location="flow '%s', group, '%s', page '%s'" % (flow_session.flow_id, page_data.group_id, page_data.page_id), repo=repo, page_desc=page_desc, commit_sha=course_commit_sha) assert page.expects_answer() if not page.is_answer_gradable(): return from course.page import PageContext grading_page_context = PageContext( course=course, repo=repo, commit_sha=course_commit_sha, flow_session=flow_session) answer_feedback = page.grade( grading_page_context, visit.page_data.data, visit.answer, grade_data=grade_data) grade = visit_grade_model() grade.visit = visit grade.grade_data = grade_data grade.max_points = page.max_points(visit.page_data) grade.graded_at_git_commit_sha = graded_at_git_commit_sha bulk_feedback_json = None if answer_feedback is not None: grade.correctness = answer_feedback.correctness grade.feedback, bulk_feedback_json = answer_feedback.as_json() grade.save() update_bulk_feedback(page_data, grade, bulk_feedback_json) # }}} # {{{ start flow def start_flow(repo, course, participation, flow_id, flow_desc, access_rules_tag, now_datetime): from course.content import get_course_commit_sha course_commit_sha = get_course_commit_sha(course, participation) session = FlowSession( course=course, participation=participation, active_git_commit_sha=course_commit_sha.decode(), flow_id=flow_id, in_progress=True, expiration_mode=flow_session_expiration_mode.end, access_rules_tag=access_rules_tag) session.save() # Create flow grading opportunity. This makes the flow # show up in the grade book. from course.utils import get_flow_rules from course.models import get_flow_grading_opportunity for grading_rule in get_flow_rules( flow_desc, flow_rule_kind.grading, participation, flow_id, now_datetime, consider_exceptions=False): identifier = getattr(grading_rule, "grade_identifier", None) if identifier is not None: get_flow_grading_opportunity( course, flow_id, flow_desc, FlowSessionGradingRule( grade_identifier=identifier, grade_aggregation_strategy=getattr( grading_rule, "grade_aggregation_strategy"), )) # will implicitly modify and save the session if there are changes from course.content import adjust_flow_session_page_data adjust_flow_session_page_data(repo, session, course.identifier, flow_desc, course_commit_sha) return session # }}} # {{{ finish flow def get_flow_session_graded_answers_qset(flow_session): from django.db.models import Q qset = (FlowPageVisit.objects .filter(flow_session=flow_session) .filter(Q(answer__isnull=False) | Q(is_synthetic=True))) if not flow_session.in_progress: # Ungraded answers *can* show up in non-in-progress flows as a result # of a race between a 'save' and the 'end session'. If this happens, # we'll go ahead and ignore those. qset = qset.filter(is_submitted_answer=True) return qset def get_prev_answer_visit(page_data): previous_answer_visits = ( get_flow_session_graded_answers_qset(page_data.flow_session) .filter(page_data=page_data) .order_by("-visit_time")) for prev_visit in previous_answer_visits[:1]: return prev_visit return None def assemble_answer_visits(flow_session): answer_visits = [None] * flow_session.page_count answer_page_visits = ( get_flow_session_graded_answers_qset(flow_session) .order_by("visit_time")) for page_visit in answer_page_visits: if page_visit.page_data.ordinal is not None: answer_visits[page_visit.page_data.ordinal] = page_visit if not flow_session.in_progress: assert page_visit.is_submitted_answer is True return answer_visits def count_answered_gradable(fctx, flow_session, answer_visits): all_page_data = (FlowPageData.objects .filter( flow_session=flow_session, ordinal__isnull=False) .order_by("ordinal")) answered_count = 0 unanswered_count = 0 for i, page_data in enumerate(all_page_data): assert i == page_data.ordinal if answer_visits[i] is not None: answer_data = answer_visits[i].answer else: answer_data = None page = instantiate_flow_page_with_ctx(fctx, page_data) if page.expects_answer() and page.is_answer_gradable(): if answer_data is None: unanswered_count += 1 else: answered_count += 1 return (answered_count, unanswered_count) class GradeInfo(object): """An object to hold a tally of points and page counts of various types in a flow. .. attribute:: points The final grade, in points. May be *None* if the grade is not yet final. """ def __init__(self, points, provisional_points, max_points, max_reachable_points, fully_correct_count, partially_correct_count, incorrect_count, unknown_count): self.points = points self.provisional_points = provisional_points self.max_points = max_points self.max_reachable_points = max_reachable_points self.fully_correct_count = fully_correct_count self.partially_correct_count = partially_correct_count self.incorrect_count = incorrect_count self.unknown_count = unknown_count # Rounding to larger than 100% will break the percent bars on the # flow results page. FULL_PERCENT = 99.99 def points_percent(self): """Only to be used for visualization purposes.""" if self.max_points is None or self.max_points == 0: if self.points == 0: return 100 else: return 0 else: return self.FULL_PERCENT*self.provisional_points/self.max_points def missed_points_percent(self): """Only to be used for visualization purposes.""" return (self.FULL_PERCENT - self.points_percent() - self.unreachable_points_percent()) def unreachable_points_percent(self): """Only to be used for visualization purposes.""" if (self.max_points is None or self.max_reachable_points is None or self.max_points == 0): return 0 else: return self.FULL_PERCENT*( self.max_points - self.max_reachable_points)/self.max_points def total_count(self): return (self.fully_correct_count + self.partially_correct_count + self.incorrect_count + self.unknown_count) def fully_correct_percent(self): """Only to be used for visualization purposes.""" return self.FULL_PERCENT*self.fully_correct_count/self.total_count() def partially_correct_percent(self): """Only to be used for visualization purposes.""" return self.FULL_PERCENT*self.partially_correct_count/self.total_count() def incorrect_percent(self): """Only to be used for visualization purposes.""" return self.FULL_PERCENT*self.incorrect_count/self.total_count() def unknown_percent(self): """Only to be used for visualization purposes.""" return self.FULL_PERCENT*self.unknown_count/self.total_count() def gather_grade_info(fctx, flow_session, answer_visits): """ :returns: a :class:`GradeInfo` """ all_page_data = (FlowPageData.objects .filter( flow_session=flow_session, ordinal__isnull=False) .order_by("ordinal")) points = 0 provisional_points = 0 max_points = 0 max_reachable_points = 0 fully_correct_count = 0 partially_correct_count = 0 incorrect_count = 0 unknown_count = 0 for i, page_data in enumerate(all_page_data): page = instantiate_flow_page_with_ctx(fctx, page_data) assert i == page_data.ordinal if answer_visits[i] is None: # This is true in principle, but early code to deal with survey questions # didn't generate synthetic answer visits for survey questions, so this # can't actually be enforced. # assert not page.expects_answer() continue if not page.is_answer_gradable(): continue grade = answer_visits[i].get_most_recent_grade() assert grade is not None feedback = get_feedback_for_grade(grade) max_points += grade.max_points if feedback is None or feedback.correctness is None: unknown_count += 1 points = None continue max_reachable_points += grade.max_points page_points = grade.max_points*feedback.correctness if points is not None: points += page_points provisional_points += page_points if grade.max_points > 0: if feedback.correctness == 1: fully_correct_count += 1 elif feedback.correctness == 0: incorrect_count += 1 else: partially_correct_count += 1 return GradeInfo( points=points, provisional_points=provisional_points, max_points=max_points, max_reachable_points=max_reachable_points, fully_correct_count=fully_correct_count, partially_correct_count=partially_correct_count, incorrect_count=incorrect_count, unknown_count=unknown_count) @transaction.atomic def grade_page_visits(fctx, flow_session, answer_visits, force_regrade=False): for i in range(len(answer_visits)): answer_visit = answer_visits[i] if answer_visit is not None: answer_visit.is_submitted_answer = True answer_visit.save() else: page_data = flow_session.page_data.get(ordinal=i) page = instantiate_flow_page_with_ctx(fctx, page_data) if not page.expects_answer(): continue # Create a synthetic visit to attach a grade answer_visit = FlowPageVisit() answer_visit.flow_session = flow_session answer_visit.page_data = page_data answer_visit.is_synthetic = True answer_visit.answer = None answer_visit.is_submitted_answer = True answer_visit.save() answer_visits[i] = answer_visit if not page.is_answer_gradable(): continue if (answer_visit is not None and (not answer_visit.grades.count() or force_regrade)): grade_page_visit(answer_visit, graded_at_git_commit_sha=fctx.course_commit_sha) @transaction.atomic def finish_flow_session(fctx, flow_session, grading_rule, force_regrade=False, now_datetime=None): if not flow_session.in_progress: raise RuntimeError("Can't end a session that's already ended") assert isinstance(grading_rule, FlowSessionGradingRule) answer_visits = assemble_answer_visits(flow_session) (answered_count, unanswered_count) = count_answered_gradable( fctx, flow_session, answer_visits) is_graded_flow = bool(answered_count + unanswered_count) if is_graded_flow: grade_page_visits(fctx, flow_session, answer_visits, force_regrade=force_regrade) # ORDERING RESTRICTION: Must grade pages before gathering grade info if now_datetime is None: from django.utils.timezone import now now_datetime = now() flow_session.completion_time = now_datetime flow_session.in_progress = False flow_session.save() return grade_flow_session(fctx, flow_session, grading_rule, answer_visits) @transaction.atomic def expire_flow_session(fctx, flow_session, grading_rule, now_datetime, past_due_only=False): if not flow_session.in_progress: raise RuntimeError("Can't expire a session that's not in progress") if flow_session.participation is None: raise RuntimeError("Can't expire an anonymous flow session") assert isinstance(grading_rule, FlowSessionGradingRule) if (past_due_only and grading_rule.due is not None and now_datetime < grading_rule.due): return False if flow_session.expiration_mode == flow_session_expiration_mode.roll_over: session_start_rule = get_session_start_rule(flow_session.course, flow_session.participation, flow_session.participation.role, flow_session.flow_id, fctx.flow_desc, now_datetime, for_rollover=True) if not session_start_rule.may_start_new_session: # No new session allowed: finish. return finish_flow_session(fctx, flow_session, grading_rule, now_datetime=now_datetime) flow_session.access_rules_tag = session_start_rule.tag_session access_rule = get_session_access_rule(flow_session, flow_session.participation.role, fctx.flow_desc, now_datetime) if not is_expiration_mode_allowed( flow_session.expiration_mode, access_rule.permissions): flow_session.expiration_mode = flow_session_expiration_mode.end flow_session.save() return True elif flow_session.expiration_mode == flow_session_expiration_mode.end: return finish_flow_session(fctx, flow_session, grading_rule, now_datetime=now_datetime) else: raise ValueError("invalid expiration mode '%s' on flow session ID %d" % (flow_session.expiration_mode, flow_session.id)) def grade_flow_session(fctx, flow_session, grading_rule, answer_visits=None): """Updates the grade on an existing flow session and logs a grade change with the grade records subsystem. """ if answer_visits is None: answer_visits = assemble_answer_visits(flow_session) (answered_count, unanswered_count) = count_answered_gradable( fctx, flow_session, answer_visits) is_graded_flow = bool(answered_count + unanswered_count) grade_info = gather_grade_info(fctx, flow_session, answer_visits) assert grade_info is not None comment = None points = grade_info.points if (points is not None and grading_rule.credit_percent is not None and grading_rule.credit_percent != 100): comment = "Counted at %.1f%% of %.1f points" % ( grading_rule.credit_percent, points) points = points * grading_rule.credit_percent / 100 flow_session.points = points flow_session.max_points = grade_info.max_points flow_session.append_comment(comment) flow_session.save() # Need to save grade record even if no grade is available yet, because # a grade record may *already* be saved, and that one might be mistaken # for the current one. if (grading_rule.grade_identifier and is_graded_flow and flow_session.participation is not None): from course.models import get_flow_grading_opportunity gopp = get_flow_grading_opportunity( flow_session.course, flow_session.flow_id, fctx.flow_desc, grading_rule) from course.models import grade_state_change_types gchange = GradeChange() gchange.opportunity = gopp gchange.participation = flow_session.participation gchange.state = grade_state_change_types.graded gchange.attempt_id = "flow-session-%d" % flow_session.id gchange.points = points gchange.max_points = grade_info.max_points # creator left as NULL gchange.flow_session = flow_session gchange.comment = comment previous_grade_changes = list(GradeChange.objects .filter( opportunity=gchange.opportunity, participation=gchange.participation, state=gchange.state, attempt_id=gchange.attempt_id, flow_session=gchange.flow_session) .order_by("-grade_time") [:1]) # only save if modified or no previous grades do_save = True if previous_grade_changes: previous_grade_change, = previous_grade_changes if (previous_grade_change.points == gchange.points and previous_grade_change.max_points == gchange.max_points and previous_grade_change.comment == gchange.comment): do_save = False else: # no previous grade changes if points is None: do_save = False if do_save: gchange.save() return grade_info def reopen_session(session, force=False, suppress_log=False): if session.in_progress: raise RuntimeError("Can't reopen a session that's already in progress") if session.participation is None: raise RuntimeError("Can't reopen anonymous sessions") if not force: other_in_progress_sessions = (FlowSession.objects .filter( participation=session.participation, flow_id=session.flow_id, in_progress=True, participation__isnull=False) .exclude(id=session.id)) if other_in_progress_sessions.count(): raise RuntimeError("Can't open multiple sessions at once") session.in_progress = True session.points = None session.max_points = None if not suppress_log: session.append_comment( "Session reopened at %s, previous completion time was '%s'." % (local_now(), as_local_time(session.completion_time))) session.completion_time = None session.save() def finish_flow_session_standalone(repo, course, session, force_regrade=False, now_datetime=None, past_due_only=False): assert session.participation is not None from course.utils import FlowContext if now_datetime is None: from django.utils.timezone import now now_datetime = now() fctx = FlowContext(repo, course, session.flow_id, flow_session=session) grading_rule = get_session_grading_rule( session, session.participation.role, fctx.flow_desc, now_datetime) if (past_due_only and grading_rule.due is not None and now_datetime < grading_rule.due): return False finish_flow_session(fctx, session, grading_rule, force_regrade=force_regrade, now_datetime=now_datetime) return True def expire_flow_session_standalone(repo, course, session, now_datetime, past_due_only=False): assert session.participation is not None from course.utils import FlowContext fctx = FlowContext(repo, course, session.flow_id, flow_session=session) grading_rule = get_session_grading_rule( session, session.participation.role, fctx.flow_desc, now_datetime) return expire_flow_session(fctx, session, grading_rule, now_datetime, past_due_only=past_due_only) @transaction.atomic def regrade_session(repo, course, session): if session.in_progress: fctx = FlowContext(repo, course, session.flow_id, flow_session=session) answer_visits = assemble_answer_visits(session) for i in range(len(answer_visits)): answer_visit = answer_visits[i] if answer_visit is not None and answer_visit.get_most_recent_grade(): # Only make a new grade if there already is one. grade_page_visit(answer_visit, graded_at_git_commit_sha=fctx.course_commit_sha) else: prev_completion_time = session.completion_time session.append_comment("Session regraded at %s." % local_now()) session.save() reopen_session(session, force=True, suppress_log=True) finish_flow_session_standalone( repo, course, session, force_regrade=True, now_datetime=prev_completion_time) @transaction.atomic def recalculate_session_grade(repo, course, session): """Only redoes the final grade determination without regrading individual pages. """ if session.in_progress: raise RuntimeError("cannot recalculate grade on in-progress session") prev_completion_time = session.completion_time session.append_comment("Session grade recomputed at %s." % local_now()) session.save() reopen_session(session, force=True, suppress_log=True) finish_flow_session_standalone( repo, course, session, force_regrade=False, now_datetime=prev_completion_time) # }}} # {{{ view: start flow @transaction.atomic @course_view def view_start_flow(pctx, flow_id): request = pctx.request now_datetime = get_now_or_fake_time(request) fctx = FlowContext(pctx.repo, pctx.course, flow_id, participation=pctx.participation) session_start_rule = get_session_start_rule(pctx.course, pctx.participation, pctx.role, flow_id, fctx.flow_desc, now_datetime, remote_address=pctx.remote_address) if request.method == "POST": if "start" in request.POST: if not session_start_rule.may_start_new_session: raise PermissionDenied("new session not allowed") session = start_flow( pctx.repo, pctx.course, pctx.participation, flow_id, fctx.flow_desc, access_rules_tag=session_start_rule.tag_session, now_datetime=now_datetime) return redirect("relate-view_flow_page", pctx.course.identifier, session.id, 0) else: raise SuspiciousOperation("unrecognized POST action") else: if session_start_rule.may_list_existing_sessions: past_sessions = (FlowSession.objects .filter( participation=pctx.participation, flow_id=fctx.flow_id, participation__isnull=False) .order_by("start_time")) from collections import namedtuple SessionProperties = namedtuple("SessionProperties", ["may_view", "may_modify", "due", "grade_description"]) past_sessions_and_properties = [] for session in past_sessions: access_rule = get_session_access_rule( session, pctx.role, fctx.flow_desc, now_datetime, remote_address=pctx.remote_address) grading_rule = get_session_grading_rule( session, pctx.role, fctx.flow_desc, now_datetime) session_properties = SessionProperties( may_view=flow_permission.view in access_rule.permissions, may_modify=( flow_permission.submit_answer in access_rule.permissions or flow_permission.end_session in access_rule.permissions ), due=grading_rule.due, grade_description=grading_rule.description) past_sessions_and_properties.append((session, session_properties)) else: past_sessions_and_properties = [] may_start = session_start_rule.may_start_new_session potential_session = FlowSession( course=pctx.course, participation=pctx.participation, flow_id=flow_id, in_progress=True, expiration_mode=flow_session_expiration_mode.end, access_rules_tag=session_start_rule.tag_session) new_session_grading_rule = get_session_grading_rule( potential_session, pctx.role, fctx.flow_desc, now_datetime) start_may_decrease_grade = ( bool(past_sessions_and_properties) and new_session_grading_rule.grade_aggregation_strategy not in [ None, grade_aggregation_strategy.max_grade, grade_aggregation_strategy.use_earliest]) return render_course_page(pctx, "course/flow-start.html", { "flow_desc": fctx.flow_desc, "flow_identifier": flow_id, "now": now_datetime, "may_start": may_start, "new_session_grading_rule": new_session_grading_rule, "grade_aggregation_strategy_descr": ( dict(GRADE_AGGREGATION_STRATEGY_CHOICES).get( new_session_grading_rule.grade_aggregation_strategy)), "start_may_decrease_grade": start_may_decrease_grade, "past_sessions_and_properties": past_sessions_and_properties, }, allow_instant_flow_requests=False) # }}} # {{{ view: flow page def get_and_check_flow_session(pctx, flow_session_id): try: flow_session = FlowSession.objects.get(id=flow_session_id) except ObjectDoesNotExist: raise http.Http404() if pctx.role in [ participation_role.instructor, participation_role.teaching_assistant]: pass elif pctx.role in [ participation_role.student, participation_role.observer, participation_role.auditor, participation_role.unenrolled]: if pctx.participation != flow_session.participation: raise PermissionDenied("may not view other people's sessions") else: raise PermissionDenied() if flow_session.course.pk != pctx.course.pk: raise SuspiciousOperation() return flow_session def will_receive_feedback(permissions): return ( flow_permission.see_correctness in permissions or flow_permission.see_answer in permissions) def add_buttons_to_form(form, fpctx, flow_session, permissions): from crispy_forms.layout import Submit form.helper.add_input( Submit("save", "Save answer", css_class="col-lg-offset-2 relate-save-button")) if will_receive_feedback(permissions): if flow_permission.change_answer in permissions: form.helper.add_input( Submit( "submit", "Submit answer for grading", accesskey="g", css_class="relate-save-button")) else: form.helper.add_input( Submit("submit", "Submit final answer", css_class="relate-save-button")) else: # Only offer 'save and move on' if student will receive no feedback if fpctx.page_data.ordinal + 1 < flow_session.page_count: form.helper.add_input( Submit("save_and_next", mark_safe("Save answer and move on »"), css_class="relate-save-button")) else: form.helper.add_input( Submit("save_and_finish", mark_safe("Save answer and finish »"), css_class="relate-save-button")) return form def get_pressed_button(form): buttons = ["save", "save_and_next", "save_and_finish", "submit"] for button in buttons: if button in form.data: return button raise SuspiciousOperation("could not find which button was pressed") def create_flow_page_visit(request, flow_session, page_data): FlowPageVisit( flow_session=flow_session, page_data=page_data, remote_address=request.META['REMOTE_ADDR'], is_submitted_answer=None).save() @course_view def view_flow_page(pctx, flow_session_id, ordinal): request = pctx.request flow_session_id = int(flow_session_id) flow_session = get_and_check_flow_session( pctx, flow_session_id) flow_id = flow_session.flow_id if flow_session is None: messages.add_message(request, messages.WARNING, "No in-progress session record found for this flow. " "Redirected to flow start page.") return redirect("relate-view_start_flow", pctx.course.identifier, flow_id) fpctx = FlowPageContext(pctx.repo, pctx.course, flow_id, ordinal, participation=pctx.participation, flow_session=flow_session) if fpctx.page_desc is None: messages.add_message(request, messages.ERROR, "Your session does not match the course content and needs " "to be reset. Course staff have been notified about this issue. " "Please get in touch with them to get help.") from django.template.loader import render_to_string message = render_to_string("course/session-mismatch.txt", { "page_data": fpctx.page_data, "course": pctx.course, "user": pctx.request.user, }) from django.core.mail import send_mail from django.conf import settings send_mail("[%s] session mismatch with course content" % pctx.course.identifier, message, settings.ROBOT_EMAIL_FROM, recipient_list=[pctx.course.notify_email]) return redirect("relate-view_start_flow", pctx.course.identifier, flow_id) access_rule = get_session_access_rule( flow_session, pctx.role, fpctx.flow_desc, get_now_or_fake_time(request), pctx.remote_address) permissions = fpctx.page.get_modified_permissions_for_page( access_rule.permissions) if access_rule.message: messages.add_message(request, messages.INFO, access_rule.message) page_context = fpctx.page_context page_data = fpctx.page_data answer_data = None grade_data = None if flow_permission.view not in permissions: raise PermissionDenied("not allowed to view flow") if request.method == "POST": if "finish" in request.POST: return redirect("relate-finish_flow_session_view", pctx.course.identifier, flow_session_id) else: submission_allowed = True # reject answer update if permission not present if flow_permission.submit_answer not in permissions: messages.add_message(request, messages.ERROR, "Answer submission not allowed.") submission_allowed = False # reject if previous answer was final if (fpctx.prev_answer_visit is not None and fpctx.prev_answer_visit.is_submitted_answer and flow_permission.change_answer not in permissions): messages.add_message(request, messages.ERROR, "Already have final answer.") submission_allowed = False form = fpctx.page.post_form( fpctx.page_context, fpctx.page_data.data, post_data=request.POST, files_data=request.FILES) pressed_button = get_pressed_button(form) if submission_allowed and form.is_valid(): # {{{ form validated, process answer messages.add_message(request, messages.INFO, "Answer saved.") page_visit = FlowPageVisit() page_visit.flow_session = flow_session page_visit.page_data = fpctx.page_data page_visit.remote_address = request.META['REMOTE_ADDR'] answer_data = page_visit.answer = fpctx.page.answer_data( fpctx.page_context, fpctx.page_data.data, form, request.FILES) page_visit.is_submitted_answer = pressed_button == "submit" page_visit.save() answer_was_graded = page_visit.is_submitted_answer may_change_answer = ( not answer_was_graded or flow_permission.change_answer in permissions) if fpctx.page.is_answer_gradable(): feedback = fpctx.page.grade( page_context, page_data.data, page_visit.answer, grade_data=None) if page_visit.is_submitted_answer: grade = FlowPageVisitGrade() grade.visit = page_visit grade.max_points = fpctx.page.max_points(page_data.data) grade.graded_at_git_commit_sha = pctx.course_commit_sha bulk_feedback_json = None if feedback is not None: grade.correctness = feedback.correctness grade.feedback, bulk_feedback_json = feedback.as_json() grade.save() update_bulk_feedback(page_data, grade, bulk_feedback_json) del grade else: feedback = None if (pressed_button == "save_and_next" and not will_receive_feedback(permissions)): return redirect("relate-view_flow_page", pctx.course.identifier, flow_session_id, fpctx.ordinal + 1) elif (pressed_button == "save_and_finish" and not will_receive_feedback(permissions)): return redirect("relate-finish_flow_session_view", pctx.course.identifier, flow_session_id) else: form = fpctx.page.make_form( page_context, page_data.data, page_visit.answer, not may_change_answer) # continue at common flow page generation below # }}} del page_visit else: # form did not validate create_flow_page_visit(request, flow_session, fpctx.page_data) answer_was_graded = False may_change_answer = True # because we were allowed this far in by the check above feedback = None # continue at common flow page generation below else: create_flow_page_visit(request, flow_session, fpctx.page_data) if fpctx.prev_answer_visit is not None: answer_was_graded = fpctx.prev_answer_visit.is_submitted_answer else: answer_was_graded = False may_change_answer = ( (not answer_was_graded or (flow_permission.change_answer in permissions)) # can happen if no answer was ever saved and flow_session.in_progress and (flow_permission.submit_answer in permissions)) if fpctx.page.expects_answer(): if fpctx.prev_answer_visit is not None: answer_data = fpctx.prev_answer_visit.answer most_recent_grade = fpctx.prev_answer_visit.get_most_recent_grade() if most_recent_grade is not None: feedback = get_feedback_for_grade(most_recent_grade) grade_data = most_recent_grade.grade_data else: feedback = None grade_data = None else: feedback = None form = fpctx.page.make_form( page_context, page_data.data, answer_data, not may_change_answer) else: form = None feedback = None # start common flow page generation # defined at this point: # form, form_html, may_change_answer, answer_was_graded, feedback if form is not None and may_change_answer: form = add_buttons_to_form(form, fpctx, flow_session, permissions) show_correctness = None show_answer = None shown_feedback = None if fpctx.page.expects_answer() and answer_was_graded: show_correctness = flow_permission.see_correctness in permissions show_answer = flow_permission.see_answer in permissions if show_correctness or show_answer: shown_feedback = feedback elif fpctx.page.expects_answer() and not answer_was_graded: # Don't show answer yet pass else: show_answer = flow_permission.see_answer in permissions title = fpctx.page.title(page_context, page_data.data) body = fpctx.page.body(page_context, page_data.data) if show_answer: correct_answer = fpctx.page.correct_answer( page_context, page_data.data, answer_data, grade_data) else: correct_answer = None # {{{ render flow page if form is not None: form_html = fpctx.page.form_to_html( pctx.request, page_context, form, answer_data) else: form_html = None expiration_mode_choices = [] for key, descr in FLOW_SESSION_EXPIRATION_MODE_CHOICES: if is_expiration_mode_allowed(key, permissions): expiration_mode_choices.append((key, descr)) args = { "flow_identifier": fpctx.flow_id, "flow_desc": fpctx.flow_desc, "ordinal": fpctx.ordinal, "page_data": fpctx.page_data, "percentage": int(100*(fpctx.ordinal+1) / flow_session.page_count), "flow_session": flow_session, "page_numbers": zip( range(flow_session.page_count), range(1, flow_session.page_count+1)), "title": title, "body": body, "form": form, "form_html": form_html, "feedback": shown_feedback, "correct_answer": correct_answer, "show_correctness": show_correctness, "may_change_answer": may_change_answer, "may_change_graded_answer": ( (flow_permission.change_answer in permissions) and flow_session.in_progress), "will_receive_feedback": will_receive_feedback(permissions), "show_answer": show_answer, "expiration_mode_choices": expiration_mode_choices, "expiration_mode_choice_count": len(expiration_mode_choices), "expiration_mode": flow_session.expiration_mode, } if fpctx.page.expects_answer() and fpctx.page.is_answer_gradable(): args["max_points"] = fpctx.page.max_points(fpctx.page_data) return render_course_page( pctx, "course/flow-page.html", args, allow_instant_flow_requests=False) # }}} @course_view def update_expiration_mode(pctx, flow_session_id): if pctx.request.method != "POST": raise SuspiciousOperation("only POST allowed") flow_session = get_object_or_404(FlowSession, id=flow_session_id) if flow_session.participation != pctx.participation: raise PermissionDenied("may only change your own flow sessions") if not flow_session.in_progress: raise PermissionDenied("may only change in-progress flow sessions") expmode = pctx.request.POST.get("expiration_mode") if not any(expmode == em_key for em_key, _ in FLOW_SESSION_EXPIRATION_MODE_CHOICES): raise SuspiciousOperation("invalid expiration mode") fctx = FlowContext(pctx.repo, pctx.course, flow_session.flow_id, participation=pctx.participation, flow_session=flow_session) access_rule = get_session_access_rule( flow_session, pctx.role, fctx.flow_desc, get_now_or_fake_time(pctx.request), pctx.remote_address) if is_expiration_mode_allowed(expmode, access_rule.permissions): flow_session.expiration_mode = expmode flow_session.save() return http.HttpResponse("OK") else: raise PermissionDenied() # }}} # {{{ view: finish flow @transaction.atomic @course_view def finish_flow_session_view(pctx, flow_session_id): now_datetime = get_now_or_fake_time(pctx.request) request = pctx.request flow_session_id = int(flow_session_id) flow_session = get_and_check_flow_session( pctx, flow_session_id) flow_id = flow_session.flow_id fctx = FlowContext(pctx.repo, pctx.course, flow_id, participation=pctx.participation, flow_session=flow_session) access_rule = get_session_access_rule( flow_session, pctx.role, fctx.flow_desc, now_datetime, pctx.remote_address) answer_visits = assemble_answer_visits(flow_session) from course.content import markup_to_html completion_text = markup_to_html( fctx.course, fctx.repo, pctx.course_commit_sha, fctx.flow_desc.completion_text) (answered_count, unanswered_count) = count_answered_gradable( fctx, flow_session, answer_visits) is_graded_flow = bool(answered_count + unanswered_count) if flow_permission.view not in access_rule.permissions: raise PermissionDenied() def render_finish_response(template, **kwargs): render_args = { "flow_identifier": fctx.flow_id, "flow_desc": fctx.flow_desc, } render_args.update(kwargs) return render_course_page( pctx, template, render_args, allow_instant_flow_requests=False) if request.method == "POST": if "submit" not in request.POST: raise SuspiciousOperation("odd POST parameters") if not flow_session.in_progress: raise PermissionDenied("Can't end a session that's already ended") if flow_permission.end_session not in access_rule.permissions: raise PermissionDenied("not permitted to end session") grading_rule = get_session_grading_rule( flow_session, pctx.role, fctx.flow_desc, now_datetime) grade_info = finish_flow_session( fctx, flow_session, grading_rule, now_datetime=now_datetime) if is_graded_flow: return render_finish_response( "course/flow-completion-grade.html", completion_text=completion_text, grade_info=grade_info) else: return render_finish_response( "course/flow-completion.html", last_page_nr=None, flow_session=flow_session, completion_text=completion_text) if (not is_graded_flow or flow_permission.end_session not in access_rule.permissions): # No ability to end--just show completion page. return render_finish_response( "course/flow-completion.html", last_page_nr=flow_session.page_count-1, flow_session=flow_session, completion_text=completion_text) elif not flow_session.in_progress: # Just reviewing: re-show grades. grade_info = gather_grade_info(fctx, flow_session, answer_visits) return render_finish_response( "course/flow-completion-grade.html", completion_text=completion_text, grade_info=grade_info) else: # confirm ending flow return render_finish_response( "course/flow-confirm-completion.html", last_page_nr=flow_session.page_count-1, flow_session=flow_session, answered_count=answered_count, unanswered_count=unanswered_count, total_count=answered_count+unanswered_count) # }}} # {{{ view: regrade flow class RegradeFlowForm(StyledForm): def __init__(self, flow_ids, *args, **kwargs): super(RegradeFlowForm, self).__init__(*args, **kwargs) self.fields["flow_id"] = forms.ChoiceField( choices=[(fid, fid) for fid in flow_ids], initial=participation_role.student, required=True) self.fields["access_rules_tag"] = forms.CharField( required=False, help_text="If non-empty, limit the regrading to sessions started " "under this access rules tag.") self.fields["regraded_session_in_progress"] = forms.ChoiceField( choices=( ("any", "Regrade in-progress and not-in-progress sessions"), ("yes", "Regrade in-progress sessions only"), ("no", "Regrade not-in-progress sessions only"), )) self.helper.add_input( Submit("regrade", "Regrade", css_class="col-lg-offset-2")) @transaction.atomic def _regrade_sessions(repo, course, sessions): count = 0 from course.flow import regrade_session for session in sessions: regrade_session(repo, course, session) count += 1 return count @course_view def regrade_not_for_credit_flows_view(pctx): if pctx.role != participation_role.instructor: raise PermissionDenied("must be instructor to regrade flows") from course.content import list_flow_ids flow_ids = list_flow_ids(pctx.repo, pctx.course_commit_sha) request = pctx.request if request.method == "POST": form = RegradeFlowForm(flow_ids, request.POST, request.FILES) if form.is_valid(): sessions = (FlowSession.objects .filter( course=pctx.course, flow_id=form.cleaned_data["flow_id"])) if form.cleaned_data["access_rules_tag"]: sessions = sessions.filter( access_rules_tag=form.cleaned_data["access_rules_tag"]) inprog_value = { "any": None, "yes": True, "no": False, }[form.cleaned_data["regraded_session_in_progress"]] if inprog_value is not None: sessions = sessions.filter( in_progress=inprog_value) count = _regrade_sessions(pctx.repo, pctx.course, sessions) messages.add_message(request, messages.SUCCESS, "%d sessions regraded." % count) else: form = RegradeFlowForm(flow_ids) return render_course_page(pctx, "course/generic-course-form.html", { "form": form, "form_text": "

This regrading process is only intended for flows " "that do not show up in the grade book." "If you would like to regrade for-credit flows, " "use the corresponding functionality in the grade book.

", "form_description": "Regrade not-for-credit Flow Sessions", }) # }}} # vim: foldmethod=marker