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from storm.locals import Desc
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from genshi.filters import HTMLFormFiller
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from ivle.webapp.base.xhtml import XHTMLView
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from ivle.webapp.base.plugins import ViewPlugin, MediaPlugin
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from ivle.webapp.errors import NotFound
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from ivle.database import Subject
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from ivle.database import Subject, Semester, Offering, Enrolment, User
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class SubjectsView(XHTMLView):
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'''The view of the list of subjects.'''
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template = 'subjects.html'
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appname = 'subjects' # XXX
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def authorize(self, req):
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return req.user is not None
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def populate(self, req, ctx):
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enrolled_subjects = req.user.subjects
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unenrolled_subjects = [subject for subject in
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req.store.find(Subject)
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if subject not in enrolled_subjects]
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ctx['enrolled_subjects'] = []
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ctx['other_subjects'] = []
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for subject in enrolled_subjects:
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new_subj['name'] = subject.name
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new_subj['url'] = subject.url
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ctx['enrolled_subjects'].append(new_subj)
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if len(unenrolled_subjects) > 0:
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for subject in unenrolled_subjects:
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new_subj['name'] = subject.name
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new_subj['url'] = subject.url
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ctx['other_subjects'].append(new_subj)
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ctx['user'] = req.user
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for semester in req.store.find(Semester).order_by(Desc(Semester.year),
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Desc(Semester.semester)):
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enrolments = semester.enrolments.find(user=req.user)
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if enrolments.count():
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ctx['semesters'].append((semester, enrolments))
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class UserValidator(formencode.FancyValidator):
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"""A FormEncode validator that turns a username into a user.
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The state must have a 'store' attribute, which is the Storm store
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def _to_python(self, value, state):
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user = User.get_by_login(state.store, value)
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raise formencode.Invalid('User does not exist', value, state)
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class NoEnrolmentValidator(formencode.FancyValidator):
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"""A FormEncode validator that ensures absence of an enrolment.
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The state must have an 'offering' attribute.
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def _to_python(self, value, state):
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if state.offering.get_enrolment(value):
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raise formencode.Invalid('User already enrolled', value, state)
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class EnrolSchema(formencode.Schema):
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user = formencode.All(NoEnrolmentValidator(), UserValidator())
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class EnrolView(XHTMLView):
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"""A form to enrol a user in an offering."""
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template = 'enrol.html'
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def __init__(self, req, subject, year, semester):
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"""Find the given offering by subject, year and semester."""
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self.context = req.store.find(Offering,
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Offering.subject_id == Subject.id,
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Subject.short_name == subject,
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Offering.semester_id == Semester.id,
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Semester.year == year,
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Semester.semester == semester).one()
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def filter(self, stream, ctx):
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return stream | HTMLFormFiller(data=ctx['data'])
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def populate(self, req, ctx):
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if req.method == 'POST':
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data = dict(req.get_fieldstorage())
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validator = EnrolSchema()
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req.offering = self.context # XXX: Getting into state.
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data = validator.to_python(data, state=req)
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self.context.enrol(data['user'])
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req.throw_redirect(req.uri)
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except formencode.Invalid, e:
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errors = e.unpack_errors()
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ctx['data'] = data or {}
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ctx['offering'] = self.context
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ctx['errors'] = errors
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class Plugin(ViewPlugin, MediaPlugin):
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('subjects/', SubjectsView),
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('subjects/:subject/:year/:semester/+enrolments/+new', EnrolView),
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('subjects', 'Subjects', 'Announcements and information about the '
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'subjects you are enrolled in.', 'subjects.png', 'subjects', 5)
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('subjects', 'Subjects',
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'View subject content and complete worksheets',
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'subjects.png', 'subjects', 5)
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media = 'subject-media'
added
removed
ivle/webapp/admin/subject.py
