grades.py

# -*- 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.
"""

import re

from django.utils.translation import ugettext_lazy as _
from django.utils.translation import pgettext
from django.shortcuts import (  # noqa
        redirect, get_object_or_404)
from django.contrib import messages  # noqa
from django.core.exceptions import (
        PermissionDenied, SuspiciousOperation, ObjectDoesNotExist)
from django.db import connection
from django import forms
from django.db import transaction
from django.utils.timezone import now
from django import http

from django.core.urlresolvers import reverse
from relate.utils import StyledForm
from crispy_forms.layout import Submit

from course.utils import course_view, render_course_page
from course.models import (
        Participation, participation_role, participation_status,
        GradingOpportunity, GradeChange, GradeStateMachine,
        grade_state_change_types,
        FlowSession)


# {{{ student grade book

@course_view
def view_participant_grades(pctx, participation_id=None):
    if pctx.participation is None:
        raise PermissionDenied(_("must be enrolled to view grades"))

    if participation_id is not None:
        grade_participation = Participation.objects.get(id=int(participation_id))
    else:
        grade_participation = pctx.participation

    if pctx.role in [
            participation_role.instructor,
            participation_role.teaching_assistant]:
        is_student_viewing = False
    elif pctx.role == participation_role.student:
        if grade_participation != pctx.participation:
            raise PermissionDenied(_("may not view other people's grades"))

        is_student_viewing = True
    else:
        raise PermissionDenied()

    # NOTE: It's important that these two queries are sorted consistently,
    # also consistently with the code below.
    grading_opps = list((GradingOpportunity.objects
            .filter(
                course=pctx.course,
                shown_in_grade_book=True,
                )
            .order_by("identifier")))

    grade_changes = list(GradeChange.objects
            .filter(
                participation=grade_participation,
                opportunity__course=pctx.course,
                opportunity__shown_in_grade_book=True)
            .order_by(
                "participation__id",
                "opportunity__identifier",
                "grade_time")
            .select_related("participation")
            .select_related("participation__user")
            .select_related("opportunity"))

    idx = 0

    grade_table = []
    for opp in grading_opps:
        if is_student_viewing:
            if not (opp.shown_in_grade_book
                    and opp.shown_in_student_grade_book):
                continue
        else:
            if not opp.shown_in_grade_book:
                continue

        while (
                idx < len(grade_changes)
                and grade_changes[idx].opportunity.identifier < opp.identifier
                ):
            idx += 1

        my_grade_changes = []
        while (
                idx < len(grade_changes)
                and grade_changes[idx].opportunity.pk == opp.pk):
            my_grade_changes.append(grade_changes[idx])
            idx += 1

        state_machine = GradeStateMachine()
        state_machine.consume(my_grade_changes)

        grade_table.append(
                GradeInfo(
                    opportunity=opp,
                    grade_state_machine=state_machine))

    return render_course_page(pctx, "course/gradebook-participant.html", {
        "grade_table": grade_table,
        "grade_participation": grade_participation,
        "grading_opportunities": grading_opps,
        "grade_state_change_types": grade_state_change_types,
        })

# }}}


# {{{ participant list

@course_view
def view_participant_list(pctx):
    if pctx.role not in [
            participation_role.instructor,
            participation_role.teaching_assistant]:
        raise PermissionDenied(_("must be instructor or TA to view grades"))

    participations = list(Participation.objects
            .filter(
                course=pctx.course,
                status=participation_status.active)
            .order_by("id")
            .select_related("user"))

    return render_course_page(pctx, "course/gradebook-participant-list.html", {
        "participations": participations,
        })

# }}}


# {{{ grading opportunity list

@course_view
def view_grading_opportunity_list(pctx):
    if pctx.role not in [
            participation_role.instructor,
            participation_role.teaching_assistant]:
        raise PermissionDenied(_("must be instructor or TA to view grades"))

    grading_opps = list((GradingOpportunity.objects
            .filter(
                course=pctx.course,
                shown_in_grade_book=True,
                )
            .order_by("identifier")))

    return render_course_page(pctx, "course/gradebook-opp-list.html", {
        "grading_opps": grading_opps,
        })

# }}}


# {{{ teacher grade book

class GradeInfo:
    def __init__(self, opportunity, grade_state_machine):
        self.opportunity = opportunity
        self.grade_state_machine = grade_state_machine


def get_grade_table(course):
    # NOTE: It's important that these queries are sorted consistently,
    # also consistently with the code below.
    grading_opps = list((GradingOpportunity.objects