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# Author: Matt Giuca, Will Grant
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"""Database utilities and content classes.
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Database Classes and Utilities for Storm ORM
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This module provides all of the classes which map to database tables.
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It also provides miscellaneous utility functions for database interaction.
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from storm.locals import create_database, Store, Int, Unicode, DateTime, \
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Reference, ReferenceSet, Bool, Storm, Desc
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from storm.expr import Select, Max
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from storm.exceptions import NotOneError, IntegrityError
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from ivle.worksheet.rst import rst
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__all__ = ['get_store',
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% (self.__class__.__name__, k))
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setattr(self, k, v)
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def get_conn_string(config):
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"""Create a Storm connection string to the IVLE database
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@param config: The IVLE configuration.
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def get_conn_string():
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Returns the Storm connection string, generated from the conf file.
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if config['database']['username']:
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clusterstr += config['database']['username']
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if config['database']['password']:
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clusterstr += ':' + config['database']['password']
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clusterstr += ivle.conf.db_user
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if ivle.conf.db_password:
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clusterstr += ':' + ivle.conf.db_password
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host = config['database']['host'] or 'localhost'
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port = config['database']['port'] or 5432
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host = ivle.conf.db_host or 'localhost'
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port = ivle.conf.db_port or 5432
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clusterstr += '%s:%d' % (host, port)
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return "postgres://%s/%s" % (clusterstr, config['database']['name'])
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def get_store(config):
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"""Create a Storm store connected to the IVLE database.
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@param config: The IVLE configuration.
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return Store(create_database(get_conn_string(config)))
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return "postgres://%s/%s" % (clusterstr, ivle.conf.db_dbname)
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Open a database connection and transaction. Return a storm.store.Store
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instance connected to the configured IVLE database.
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return Store(create_database(get_conn_string()))
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"""An IVLE user account."""
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Represents an IVLE user.
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__storm_table__ = "login"
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id = Int(primary=True, name="loginid")
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return self._get_enrolments(False)
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def get_projects(self, offering=None, active_only=True):
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"""Find projects that the user can submit.
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'''Return Projects that the user can submit.
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This will include projects for offerings in which the user is
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enrolled, as long as the project is not in a project set which has
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groups (ie. if maximum number of group members is 0).
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@param active_only: Whether to only search active offerings.
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@param offering: An optional offering to restrict the search to.
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Unless active_only is False, only projects for active offerings will
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If an offering is specified, returned projects will be limited to
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those for that offering.
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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.id,
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ProjectSet.max_students_per_group == None,
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ProjectSet.max_students_per_group == 0,
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ProjectSet.offering_id == Offering.id,
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(offering is None) or (Offering.id == offering.id),
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Semester.id == Offering.semester_id,
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(not active_only) or (Semester.state == u'current'),
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Enrolment.offering_id == Offering.id,
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Enrolment.user_id == self.id,
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Enrolment.active == True)
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Enrolment.user_id == self.id)
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def hash_password(password):
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"""Hash a password with MD5."""
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return hashlib.md5(password).hexdigest()
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return md5.md5(password).hexdigest()
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def get_by_login(cls, store, login):
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"""Find a user in a store by login name."""
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Get the User from the db associated with a given store and
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return store.find(cls, cls.login == unicode(login)).one()
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def get_permissions(self, user, config):
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"""Determine privileges held by a user over this object.
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If the user requesting privileges is this user or an admin,
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they may do everything. Otherwise they may do nothing.
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def get_permissions(self, user):
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if user and user.admin or user is self:
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return set(['view_public', 'view', 'edit', 'submit_project'])
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return set(['view', 'edit', 'submit_project'])
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return set(['view_public'])
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# SUBJECTS AND ENROLMENTS #
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class Subject(Storm):
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"""A subject (or course) which is run in some semesters."""
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__storm_table__ = "subject"
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id = Int(primary=True, name="subjectid")
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code = Unicode(name="subj_code")
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name = Unicode(name="subj_name")
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short_name = Unicode(name="subj_short_name")
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offerings = ReferenceSet(id, 'Offering.subject_id')
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perms.add('edit')
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def active_offerings(self):
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"""Find active offerings for this subject.
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Return a sequence of currently active offerings for this subject
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(offerings whose semester.state is "current"). There should be 0 or 1
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elements in this sequence, but it's possible there are more.
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return self.offerings.find(Offering.semester_id == Semester.id,
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Semester.state == u'current')
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def offering_for_semester(self, year, semester):
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"""Get the offering for the given year/semester, or None.
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@param year: A string representation of the year.
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@param semester: A string representation of the semester.
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return self.offerings.find(Offering.semester_id == Semester.id,
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Semester.year == unicode(year),
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Semester.semester == unicode(semester)).one()
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class Semester(Storm):
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"""A semester in which subjects can be run."""
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__storm_table__ = "semester"
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id = Int(primary=True, name="semesterid")
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def enrol(self, user, role=u'student'):
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"""Enrol a user in this offering.
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Enrolments handle both the staff and student cases. The role controls
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the privileges granted by this enrolment.
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'''Enrol a user in this offering.'''
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enrolment = Store.of(self).find(Enrolment,
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Enrolment.user_id == user.id,
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Enrolment.offering_id == self.id).one()
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Enrolment.offering_id == self.id).one()
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Store.of(enrolment).remove(enrolment)
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def get_permissions(self, user, config):
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def get_permissions(self, user):
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if user is not None:
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enrolment = self.get_enrolment(user)
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if enrolment or user.admin:
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perms.add('view')
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if enrolment and enrolment.role == u'tutor':
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perms.add('view_project_submissions')
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# Site-specific policy on the role of tutors
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if config['policy']['tutors_can_enrol_students']:
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perms.add('enrol_student')
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if config['policy']['tutors_can_edit_worksheets']:
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perms.add('edit_worksheets')
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if config['policy']['tutors_can_admin_groups']:
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perms.add('admin_groups')
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if (enrolment and enrolment.role in (u'lecturer')) or user.admin:
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perms.add('view_project_submissions')
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perms.add('admin_groups')
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perms.add('edit_worksheets')
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perms.add('view_worksheet_marks')
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perms.add('edit') # Can edit projects & details
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perms.add('enrol') # Can see enrolment screen at all
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perms.add('enrol_student') # Can enrol students
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perms.add('enrol_tutor') # Can enrol tutors
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perms.add('enrol_lecturer') # Can enrol lecturers
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if (enrolment and enrolment.role in (u'tutor', u'lecturer')) \
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def get_enrolment(self, user):
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"""Find the user's enrolment in this offering."""
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enrolment = self.enrolments.find(user=user).one()
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except NotOneError:
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def get_members_by_role(self, role):
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return Store.of(self).find(User,
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Enrolment.user_id == User.id,
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Enrolment.offering_id == self.id,
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Enrolment.role == role
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).order_by(User.login)
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return self.get_members_by_role(u'student')
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def get_open_projects_for_user(self, user):
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"""Find all projects currently open to submissions by a user."""
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# XXX: Respect extensions.
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return self.projects.find(Project.deadline > datetime.datetime.now())
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def clone_worksheets(self, source):
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"""Clone all worksheets from the specified source to this offering."""
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import ivle.worksheet.utils
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for worksheet in source.worksheets:
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newws.seq_no = worksheet.seq_no
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newws.identifier = worksheet.identifier
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newws.name = worksheet.name
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newws.assessable = worksheet.assessable
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newws.published = worksheet.published
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newws.data = worksheet.data
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newws.format = worksheet.format
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newws.offering = self
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Store.of(self).add(newws)
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ivle.worksheet.utils.update_exerciselist(newws)
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class Enrolment(Storm):
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"""An enrolment of a user in an offering.
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This represents the roles of both staff and students.
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__storm_table__ = "enrolment"
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__storm_primary__ = "user_id", "offering_id"
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return "<%s %r in %r>" % (type(self).__name__, self.user,
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def get_permissions(self, user, config):
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# A user can edit any enrolment that they could have created.
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if ('enrol_' + str(self.role)) in self.offering.get_permissions(
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"""Delete this enrolment."""
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Store.of(self).remove(self)
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class ProjectSet(Storm):
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"""A set of projects that share common groups.
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Each student project group is attached to a project set. The group is
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valid for all projects in the group's set.
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__storm_table__ = "project_set"
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id = Int(name="projectsetid", primary=True)
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return "<%s %d in %r>" % (type(self).__name__, self.id,
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def get_permissions(self, user, config):
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return self.offering.get_permissions(user, config)
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def get_groups_for_user(self, user):
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"""List all groups in this offering of which the user is a member."""
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return Store.of(self).find(
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ProjectGroupMembership.user_id == user.id,
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ProjectGroupMembership.project_group_id == ProjectGroup.id,
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ProjectGroup.project_set_id == self.id)
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def get_submission_principal(self, user):
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"""Get the principal on behalf of which the user can submit.
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If this is a solo project set, the given user is returned. If
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the user is a member of exactly one group, all the group is
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returned. Otherwise, None is returned.
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groups = self.get_groups_for_user(user)
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if groups.count() == 1:
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return self.max_students_per_group is not None
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"""Get the entities (groups or users) assigned to submit this project.
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This will be a Storm ResultSet.
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#If its a solo project, return everyone in offering
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return self.project_groups
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return self.offering.students
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class DeadlinePassed(Exception):
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"""An exception indicating that a project cannot be submitted because the
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deadline has passed."""
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return "The project deadline has passed"
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class Project(Storm):
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"""A student project for which submissions can be made."""
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__storm_table__ = "project"
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id = Int(name="projectid", primary=True)
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return "<%s '%s' in %r>" % (type(self).__name__, self.short_name,
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self.project_set.offering)
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def can_submit(self, principal, user):
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def can_submit(self, principal):
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return (self in principal.get_projects() and
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not self.has_deadline_passed(user))
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self.deadline > datetime.datetime.now())
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def submit(self, principal, path, revision, who):
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"""Submit a Subversion path and revision to a project.
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@param principal: The owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made
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@param path: A path within that repository to submit.
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@param revision: The revision of that path to submit.
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@param who: The user who is actually making the submission.
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'principal' is the owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made. 'path' is
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a path within that repository, and 'revision' specifies which
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revision of that path. 'who' is the person making the submission.
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if not self.can_submit(principal, who):
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raise DeadlinePassed()
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if not self.can_submit(principal):
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raise Exception('cannot submit')
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a = Assessed.get(Store.of(self), principal, self)
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ps = ProjectSubmission()
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# Raise SubmissionError if the path is illegal
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ps.path = ProjectSubmission.test_and_normalise_path(path)
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ps.revision = revision
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ps.date_submitted = datetime.datetime.now()
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def get_permissions(self, user, config):
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return self.project_set.offering.get_permissions(user, config)
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def latest_submissions(self):
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"""Return the latest submission for each Assessed."""
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return Store.of(self).find(ProjectSubmission,
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Assessed.project_id == self.id,
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ProjectSubmission.assessed_id == Assessed.id,
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ProjectSubmission.date_submitted == Select(
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Max(ProjectSubmission.date_submitted),
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ProjectSubmission.assessed_id == Assessed.id,
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tables=ProjectSubmission
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def has_deadline_passed(self, user):
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"""Check whether the deadline has passed."""
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# XXX: Need to respect extensions.
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return self.deadline < datetime.datetime.now()
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def get_submissions_for_principal(self, principal):
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"""Fetch a ResultSet of all submissions by a particular principal."""
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assessed = Assessed.get(Store.of(self), principal, self)
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return assessed.submissions
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class ProjectGroup(Storm):
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"""A group of students working together on a project."""
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__storm_table__ = "project_group"
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id = Int(name="groupid", primary=True)
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def display_name(self):
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"""Returns the "nice name" of the user or group."""
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def short_name(self):
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"""Returns the database "identifier" name of the user or group."""
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return '%s (%s)' % (self.nick, self.name)
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def get_projects(self, offering=None, active_only=True):
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'''Find projects that the group can submit.
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'''Return Projects that the group can submit.
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This will include projects in the project set which owns this group,
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unless the project set disallows groups (in which case none will be
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@param active_only: Whether to only search active offerings.
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@param offering: An optional offering to restrict the search to.
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Unless active_only is False, projects will only be returned if the
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group's offering is active.
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If an offering is specified, projects will only be returned if it
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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.id,
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ProjectSet.id == self.project_set.id,
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ProjectSet.max_students_per_group != None,
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ProjectSet.max_students_per_group > 0,
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ProjectSet.offering_id == Offering.id,
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(offering is None) or (Offering.id == offering.id),
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Semester.id == Offering.semester_id,
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(not active_only) or (Semester.state == u'current'))
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def get_permissions(self, user, config):
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def get_permissions(self, user):
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if user.admin or user in self.members:
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return set(['submit_project'])
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class ProjectGroupMembership(Storm):
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"""A student's membership in a project group."""
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__storm_table__ = "group_member"
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__storm_primary__ = "user_id", "project_group_id"
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project = Reference(project_id, Project.id)
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extensions = ReferenceSet(id, 'ProjectExtension.assessed_id')
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submissions = ReferenceSet(
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id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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submissions = ReferenceSet(id, 'ProjectSubmission.assessed_id')
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def __repr__(self):
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return "<%s %r in %r>" % (type(self).__name__,
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self.user or self.project_group, self.project)
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"""True if the Assessed is a group, False if it is a user."""
761
return self.project_group is not None
765
return self.project_group or self.user
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def checkout_location(self):
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"""Returns the location of the Subversion workspace for this piece of
770
assessment, relative to each group member's home directory."""
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subjectname = self.project.project_set.offering.subject.short_name
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checkout_dir_name = self.principal.short_name
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checkout_dir_name = "mywork"
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return subjectname + "/" + checkout_dir_name
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def get(cls, store, principal, project):
780
"""Find or create an Assessed for the given user or group and project.
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@param principal: The user or group.
783
@param project: The project.
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t = type(principal)
786
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if t not in (User, ProjectGroup):
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raise AssertionError('principal must be User or ProjectGroup')
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approver = Reference(approver_id, User.id)
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notes = Unicode()
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class SubmissionError(Exception):
823
"""Denotes a validation error during submission."""
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class ProjectSubmission(Storm):
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"""A submission from a user or group repository to a particular project.
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The content of a submission is a single path and revision inside a
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repository. The repository is that owned by the submission's user and
831
group, while the path and revision are explicit.
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The user or group and project are specified by the Assessed.
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__storm_table__ = "project_submission"
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id = Int(name="submissionid", primary=True)
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submitter = Reference(submitter_id, User.id)
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date_submitted = DateTime()
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def get_verify_url(self, user):
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"""Get the URL for verifying this submission, within the account of
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# If this is a solo project, then self.path will be prefixed with the
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# subject name. Remove the first path segment.
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submitpath = self.path[1:] if self.path[:1] == '/' else self.path
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if not self.assessed.is_group:
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if '/' in submitpath:
855
submitpath = submitpath.split('/', 1)[1]
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return "/files/%s/%s/%s?r=%d" % (user.login,
859
self.assessed.checkout_location, submitpath, self.revision)
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def test_and_normalise_path(path):
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"""Test that path is valid, and normalise it. This prevents possible
864
injections using malicious paths.
865
Returns the updated path, if successful.
866
Raises SubmissionError if invalid.
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# Ensure the path is absolute to prevent being tacked onto working
870
# Prevent '\n' because it will break all sorts of things.
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# Prevent '[' and ']' because they can be used to inject into the
873
# Normalise to avoid resulting in ".." path segments.
874
if not os.path.isabs(path):
875
raise SubmissionError("Path is not absolute")
876
if any(c in path for c in "\n[]"):
877
raise SubmissionError("Path must not contain '\\n', '[' or ']'")
878
return os.path.normpath(path)
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578
# WORKSHEETS AND EXERCISES #
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class Exercise(Storm):
883
"""An exercise for students to complete in a worksheet.
885
An exercise may be present in any number of worksheets.
888
581
__storm_table__ = "exercise"
889
582
id = Unicode(primary=True, name="identifier")
912
605
def __repr__(self):
913
606
return "<%s %s>" % (type(self).__name__, self.name)
915
def get_permissions(self, user, config):
916
return self.global_permissions(user, config)
919
def global_permissions(user, config):
920
"""Gets the set of permissions this user has over *all* exercises.
921
This is used to determine who may view the exercises list, and create
608
def get_permissions(self, user):
925
611
if user is not None:
927
613
perms.add('edit')
928
614
perms.add('view')
929
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
932
elif (config['policy']['tutors_can_edit_worksheets']
933
and u'tutor' in set((e.role for e in user.active_enrolments))):
934
# Site-specific policy on the role of tutors
615
elif 'lecturer' in set((e.role for e in user.active_enrolments)):
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621
def get_description(self):
941
"""Return the description interpreted as reStructuredText."""
942
622
return rst(self.description)
944
624
def delete(self):
986
660
def __repr__(self):
987
661
return "<%s %s>" % (type(self).__name__, self.name)
663
# XXX Refactor this - make it an instance method of Subject rather than a
664
# class method of Worksheet. Can't do that now because Subject isn't
665
# linked referentially to the Worksheet.
667
def get_by_name(cls, store, subjectname, worksheetname):
669
Get the Worksheet from the db associated with a given store, subject
670
name and worksheet name.
672
return store.find(cls, cls.subject == unicode(subjectname),
673
cls.name == unicode(worksheetname)).one()
989
675
def remove_all_exercises(self):
990
"""Remove all exercises from this worksheet.
677
Remove all exercises from this worksheet.
992
678
This does not delete the exercises themselves. It just removes them
993
679
from the worksheet.
998
684
raise IntegrityError()
999
685
store.find(WorksheetExercise,
1000
686
WorksheetExercise.worksheet == self).remove()
1002
def get_permissions(self, user, config):
1003
offering_perms = self.offering.get_permissions(user, config)
1007
# Anybody who can view an offering can view a published
1009
if 'view' in offering_perms and self.published:
1012
# Any worksheet editors can both view and edit.
1013
if 'edit_worksheets' in offering_perms:
688
def get_permissions(self, user):
689
return self.offering.get_permissions(user)
1019
691
def get_xml(self):
1020
692
"""Returns the xml of this worksheet, converts from rst if required."""
1021
693
if self.format == u'rst':
1025
697
return self.data
1027
699
def delete(self):
1028
700
"""Deletes the worksheet, provided it has no attempts on any exercises.
1030
702
Returns True if delete succeeded, or False if this worksheet has
1031
703
attempts attached."""
1032
704
for ws_ex in self.all_worksheet_exercises:
1033
705
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
1034
706
raise IntegrityError()
1036
708
self.remove_all_exercises()
1037
709
Store.of(self).remove(self)
1039
711
class WorksheetExercise(Storm):
1040
"""A link between a worksheet and one of its exercises.
1042
These may be marked optional, in which case the exercise does not count
1043
for marking purposes. The sequence number is used to order the worksheet
1047
712
__storm_table__ = "worksheet_exercise"
1049
714
id = Int(primary=True, name="ws_ex_id")
1051
716
worksheet_id = Int(name="worksheetid")
1065
730
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
1066
731
self.worksheet.identifier)
1068
def get_permissions(self, user, config):
1069
return self.worksheet.get_permissions(user, config)
733
def get_permissions(self, user):
734
return self.worksheet.get_permissions(user)
1072
737
class ExerciseSave(Storm):
1073
"""A potential exercise solution submitted by a user for storage.
1075
This is not an actual tested attempt at an exercise, it's just a save of
1076
the editing session.
739
Represents a potential solution to an exercise that a user has submitted
740
to the server for storage.
741
A basic ExerciseSave is just the current saved text for this exercise for
742
this user (doesn't count towards their attempts).
743
ExerciseSave may be extended with additional semantics (such as
1079
746
__storm_table__ = "exercise_save"
1080
747
__storm_primary__ = "ws_ex_id", "user_id"
1092
759
def __repr__(self):
1093
760
return "<%s %s by %s at %s>" % (type(self).__name__,
1094
self.worksheet_exercise.exercise.name, self.user.login,
1095
self.date.strftime("%c"))
761
self.exercise.name, self.user.login, self.date.strftime("%c"))
1097
763
class ExerciseAttempt(ExerciseSave):
1098
"""An attempt at solving an exercise.
1100
This is a special case of ExerciseSave, used when the user submits a
1101
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1104
In addition, it contains information about the result of the submission:
1106
- complete - True if this submission was successful, rendering this
1107
exercise complete for this user in this worksheet.
1108
- active - True if this submission is "active" (usually true).
1109
Submissions may be de-activated by privileged users for
1110
special reasons, and then they won't count (either as a
1111
penalty or success), but will still be stored.
765
An ExerciseAttempt is a special case of an ExerciseSave. Like an
766
ExerciseSave, it constitutes exercise solution data that the user has
767
submitted to the server for storage.
768
In addition, it contains additional information about the submission.
769
complete - True if this submission was successful, rendering this exercise
770
complete for this user.
771
active - True if this submission is "active" (usually true). Submissions
772
may be de-activated by privileged users for special reasons, and then
773
they won't count (either as a penalty or success), but will still be
1114
776
__storm_table__ = "exercise_attempt"
1115
777
__storm_primary__ = "ws_ex_id", "user_id", "date"
1119
781
text = Unicode(name="attempt")
1120
782
complete = Bool()
1123
def get_permissions(self, user, config):
785
def get_permissions(self, user):
1124
786
return set(['view']) if user is self.user else set()
1126
788
class TestSuite(Storm):
1127
"""A container to group an exercise's test cases.
1129
The test suite contains some information on how to test. The function to
1130
test, variables to set and stdin data are stored here.
789
"""A Testsuite acts as a container for the test cases of an exercise."""
1133
790
__storm_table__ = "test_suite"
1134
791
__storm_primary__ = "exercise_id", "suiteid"
1137
794
exercise_id = Unicode(name="exerciseid")
1138
795
description = Unicode()
1142
799
exercise = Reference(exercise_id, Exercise.id)
1143
800
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1144
801
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1146
803
def delete(self):
1147
804
"""Delete this suite, without asking questions."""
1148
for variable in self.variables:
805
for vaariable in self.variables:
1149
806
variable.delete()
1150
807
for test_case in self.test_cases:
1151
808
test_case.delete()
1152
809
Store.of(self).remove(self)
1154
811
class TestCase(Storm):
1155
"""A container for actual tests (see TestCasePart), inside a test suite.
1157
It is the lowest level shown to students on their pass/fail status."""
812
"""A TestCase is a member of a TestSuite.
814
It contains the data necessary to check if an exercise is correct"""
1159
815
__storm_table__ = "test_case"
1160
816
__storm_primary__ = "testid", "suiteid"
1164
820
suite = Reference(suiteid, "TestSuite.suiteid")
1165
821
passmsg = Unicode()
1166
822
failmsg = Unicode()
1167
test_default = Unicode() # Currently unused - only used for file matching.
823
test_default = Unicode()
1170
826
parts = ReferenceSet(testid, "TestCasePart.testid")
1172
828
__init__ = _kwarg_init
1174
830
def delete(self):
1175
831
for part in self.parts:
1177
833
Store.of(self).remove(self)
1179
835
class TestSuiteVar(Storm):
1180
"""A variable used by an exercise test suite.
1182
This may represent a function argument or a normal variable.
836
"""A container for the arguments of a Test Suite"""
1185
837
__storm_table__ = "suite_variable"
1186
838
__storm_primary__ = "varid"
1190
842
var_name = Unicode()
1191
843
var_value = Unicode()
1192
844
var_type = Unicode()
1195
847
suite = Reference(suiteid, "TestSuite.suiteid")
1197
849
__init__ = _kwarg_init
1199
851
def delete(self):
1200
852
Store.of(self).remove(self)
1202
854
class TestCasePart(Storm):
1203
"""An actual piece of code to test an exercise solution."""
855
"""A container for the test elements of a Test Case"""
1205
856
__storm_table__ = "test_case_part"
1206
857
__storm_primary__ = "partid"
1211
862
part_type = Unicode()
1212
863
test_type = Unicode()
1213
864
data = Unicode()
1214
865
filename = Unicode()
1216
867
test = Reference(testid, "TestCase.testid")
1218
869
__init__ = _kwarg_init
1220
871
def delete(self):
1221
872
Store.of(self).remove(self)
added
removed
ivle/database.py
