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# Author: Matt Giuca, Will Grant
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Database Classes and Utilities for Storm ORM
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"""Database utilities and content classes.
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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():
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Returns the Storm connection string, generated from the conf file.
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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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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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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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host = ivle.conf.db_host or 'localhost'
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port = ivle.conf.db_port or 5432
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host = config['database']['host'] or 'localhost'
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port = config['database']['port'] or 5432
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clusterstr += '%s:%d' % (host, port)
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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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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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Represents an IVLE user.
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"""An IVLE user account."""
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__storm_table__ = "login"
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id = Int(primary=True, name="loginid")
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# TODO: Invitations should be listed too?
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def get_groups(self, offering=None):
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"""Get groups of which this user is a member.
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@param offering: An optional offering to restrict the search to.
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ProjectGroupMembership.user_id == self.id,
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ProjectGroup.id == ProjectGroupMembership.project_group_id,
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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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'''Return Projects that the user can submit.
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"""Find 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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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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@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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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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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.user_id == self.id,
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Enrolment.active == True)
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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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def get_by_login(cls, store, login):
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Get the User from the db associated with a given store and
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"""Find a user in a store by login name."""
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return store.find(cls, cls.login == unicode(login)).one()
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def get_permissions(self, user):
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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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if user and user.admin or user is self:
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return set(['view', 'edit', 'submit_project'])
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return set(['view_public', '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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def __repr__(self):
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return "<%s '%s'>" % (type(self).__name__, self.short_name)
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def get_permissions(self, user):
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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 an admin, they may edit.
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Otherwise they may only read.
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if user is not None:
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perms.add('view')
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def active_offerings(self):
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"""Return a sequence of currently active offerings for this subject
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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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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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"""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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return "<%s %s/%s>" % (type(self).__name__, self.year, self.semester)
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class Offering(Storm):
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"""An offering of a subject in a particular semester."""
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__storm_table__ = "offering"
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id = Int(primary=True, name="offeringid")
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subject = Reference(subject_id, Subject.id)
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semester_id = Int(name="semesterid")
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semester = Reference(semester_id, Semester.id)
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description = Unicode()
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groups_student_permissions = Unicode()
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enrolments = ReferenceSet(id, 'Enrolment.offering_id')
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'Enrolment.user_id',
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project_sets = ReferenceSet(id, 'ProjectSet.offering_id')
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projects = ReferenceSet(id,
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'ProjectSet.offering_id',
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'Project.project_set_id')
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worksheets = ReferenceSet(id,
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'Worksheet.offering_id',
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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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"""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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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):
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def get_permissions(self, user, config):
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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 in (u'tutor', u'lecturer')) \
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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('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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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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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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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):
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def can_submit(self, principal, user):
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return (self in principal.get_projects() and
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self.deadline > datetime.datetime.now())
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not self.has_deadline_passed(user))
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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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'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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@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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if not self.can_submit(principal):
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raise Exception('cannot submit')
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if not self.can_submit(principal, who):
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raise DeadlinePassed()
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a = Assessed.get(Store.of(self), principal, self)
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ps = ProjectSubmission()
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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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return '%s (%s)' % (self.nick, self.name)
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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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def get_projects(self, offering=None, active_only=True):
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'''Return Projects that the group can submit.
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'''Find 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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Unless active_only is False, projects will only be returned if the
490
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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@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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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.id,
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(not active_only) or (Semester.state == u'current'))
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def get_permissions(self, user):
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def get_permissions(self, user, config):
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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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self.project_group)
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class Assessed(Storm):
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"""A composite of a user or group combined with a project.
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Each project submission and extension refers to an Assessed. It is the
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sole specifier of the repository and project.
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__storm_table__ = "assessed"
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id = Int(name="assessedid", primary=True)
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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(id, 'ProjectSubmission.assessed_id')
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submissions = ReferenceSet(
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id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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def __repr__(self):
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return "<%s %r in %r>" % (type(self).__name__,
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721
self.user or self.project_group, self.project)
725
"""True if the Assessed is a group, False if it is a user."""
726
return self.project_group is not None
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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
735
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):
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"""Find or create an Assessed for the given user or group and project.
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@param principal: The user or group.
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@param project: The project.
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t = type(principal)
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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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a = store.find(cls,
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(t is User) or (cls.project_group_id == principal.id),
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(t is ProjectGroup) or (cls.user_id == principal.id),
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Project.id == project.id).one()
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cls.project_id == project.id).one()
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class ProjectExtension(Storm):
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"""An extension granted to a user or group on a particular project.
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The user or group and project are specified by the Assessed.
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__storm_table__ = "project_extension"
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id = Int(name="extensionid", primary=True)
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notes = Unicode()
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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
791
repository. The repository is that owned by the submission's user and
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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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805
submitter = Reference(submitter_id, User.id)
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date_submitted = DateTime()
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def get_verify_url(self, user):
809
"""Get the URL for verifying this submission, within the account of
811
# If this is a solo project, then self.path will be prefixed with the
812
# subject name. Remove the first path segment.
813
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
814
if not self.assessed.is_group:
815
if '/' in submitpath:
816
submitpath = submitpath.split('/', 1)[1]
819
return "/files/%s/%s/%s?r=%d" % (user.login,
820
self.assessed.checkout_location, submitpath, self.revision)
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822
# WORKSHEETS AND EXERCISES #
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824
class Exercise(Storm):
825
"""An exercise for students to complete in a worksheet.
827
An exercise may be present in any number of worksheets.
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__storm_table__ = "exercise"
596
831
id = Unicode(primary=True, name="identifier")
619
854
def __repr__(self):
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855
return "<%s %s>" % (type(self).__name__, self.name)
622
def get_permissions(self, user):
857
def get_permissions(self, user, config):
858
return self.global_permissions(user, config)
861
def global_permissions(user, config):
862
"""Gets the set of permissions this user has over *all* exercises.
863
This is used to determine who may view the exercises list, and create
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867
if user is not None:
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869
perms.add('edit')
628
870
perms.add('view')
629
elif 'lecturer' in set((e.role for e in user.active_enrolments)):
871
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
874
elif (config['policy']['tutors_can_edit_worksheets']
875
and u'tutor' in set((e.role for e in user.active_enrolments))):
876
# Site-specific policy on the role of tutors
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def get_description(self):
883
"""Return the description interpreted as reStructuredText."""
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return rst(self.description)
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def delete(self):
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Store.of(self).remove(self)
646
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class Worksheet(Storm):
895
"""A worksheet with exercises for students to complete.
897
Worksheets are owned by offerings.
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900
__storm_table__ = "worksheet"
649
902
id = Int(primary=True, name="worksheetid")
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928
return "<%s %s>" % (type(self).__name__, self.name)
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930
def remove_all_exercises(self):
679
Remove all exercises from this worksheet.
931
"""Remove all exercises from this worksheet.
680
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This does not delete the exercises themselves. It just removes them
681
934
from the worksheet.
686
939
raise IntegrityError()
687
940
store.find(WorksheetExercise,
688
941
WorksheetExercise.worksheet == self).remove()
690
def get_permissions(self, user):
691
return self.offering.get_permissions(user)
943
def get_permissions(self, user, config):
944
# Almost the same permissions as for the offering itself
945
perms = self.offering.get_permissions(user, config)
946
# However, "edit" permission is derived from the "edit_worksheets"
947
# permission of the offering
948
if 'edit_worksheets' in perms:
951
perms.discard('edit')
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954
def get_xml(self):
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"""Returns the xml of this worksheet, converts from rst if required."""
695
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if self.format == u'rst':
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962
def delete(self):
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"""Deletes the worksheet, provided it has no attempts on any exercises.
704
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Returns True if delete succeeded, or False if this worksheet has
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966
attempts attached."""
706
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for ws_ex in self.all_worksheet_exercises:
707
968
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
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raise IntegrityError()
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self.remove_all_exercises()
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Store.of(self).remove(self)
713
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class WorksheetExercise(Storm):
975
"""A link between a worksheet and one of its exercises.
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These may be marked optional, in which case the exercise does not count
978
for marking purposes. The sequence number is used to order the worksheet
714
982
__storm_table__ = "worksheet_exercise"
716
984
id = Int(primary=True, name="ws_ex_id")
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986
worksheet_id = Int(name="worksheetid")
732
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return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
733
1001
self.worksheet.identifier)
735
def get_permissions(self, user):
736
return self.worksheet.get_permissions(user)
1003
def get_permissions(self, user, config):
1004
return self.worksheet.get_permissions(user, config)
739
1007
class ExerciseSave(Storm):
741
Represents a potential solution to an exercise that a user has submitted
742
to the server for storage.
743
A basic ExerciseSave is just the current saved text for this exercise for
744
this user (doesn't count towards their attempts).
745
ExerciseSave may be extended with additional semantics (such as
1008
"""A potential exercise solution submitted by a user for storage.
1010
This is not an actual tested attempt at an exercise, it's just a save of
1011
the editing session.
748
1014
__storm_table__ = "exercise_save"
749
1015
__storm_primary__ = "ws_ex_id", "user_id"
763
1029
self.exercise.name, self.user.login, self.date.strftime("%c"))
765
1031
class ExerciseAttempt(ExerciseSave):
767
An ExerciseAttempt is a special case of an ExerciseSave. Like an
768
ExerciseSave, it constitutes exercise solution data that the user has
769
submitted to the server for storage.
770
In addition, it contains additional information about the submission.
771
complete - True if this submission was successful, rendering this exercise
772
complete for this user.
773
active - True if this submission is "active" (usually true). Submissions
774
may be de-activated by privileged users for special reasons, and then
775
they won't count (either as a penalty or success), but will still be
1032
"""An attempt at solving an exercise.
1034
This is a special case of ExerciseSave, used when the user submits a
1035
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1038
In addition, it contains information about the result of the submission:
1040
- complete - True if this submission was successful, rendering this
1041
exercise complete for this user in this worksheet.
1042
- active - True if this submission is "active" (usually true).
1043
Submissions may be de-activated by privileged users for
1044
special reasons, and then they won't count (either as a
1045
penalty or success), but will still be stored.
778
1048
__storm_table__ = "exercise_attempt"
779
1049
__storm_primary__ = "ws_ex_id", "user_id", "date"
783
1053
text = Unicode(name="attempt")
784
1054
complete = Bool()
787
def get_permissions(self, user):
1057
def get_permissions(self, user, config):
788
1058
return set(['view']) if user is self.user else set()
790
1060
class TestSuite(Storm):
791
"""A Testsuite acts as a container for the test cases of an exercise."""
1061
"""A container to group an exercise's test cases.
1063
The test suite contains some information on how to test. The function to
1064
test, variables to set and stdin data are stored here.
792
1067
__storm_table__ = "test_suite"
793
1068
__storm_primary__ = "exercise_id", "suiteid"
796
1071
exercise_id = Unicode(name="exerciseid")
797
1072
description = Unicode()
801
1076
exercise = Reference(exercise_id, Exercise.id)
802
1077
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
803
1078
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
805
1080
def delete(self):
806
1081
"""Delete this suite, without asking questions."""
807
for vaariable in self.variables:
1082
for variable in self.variables:
808
1083
variable.delete()
809
1084
for test_case in self.test_cases:
810
1085
test_case.delete()
811
1086
Store.of(self).remove(self)
813
1088
class TestCase(Storm):
814
"""A TestCase is a member of a TestSuite.
816
It contains the data necessary to check if an exercise is correct"""
1089
"""A container for actual tests (see TestCasePart), inside a test suite.
1091
It is the lowest level shown to students on their pass/fail status."""
817
1093
__storm_table__ = "test_case"
818
1094
__storm_primary__ = "testid", "suiteid"
822
1098
suite = Reference(suiteid, "TestSuite.suiteid")
823
1099
passmsg = Unicode()
824
1100
failmsg = Unicode()
825
test_default = Unicode()
1101
test_default = Unicode() # Currently unused - only used for file matching.
828
1104
parts = ReferenceSet(testid, "TestCasePart.testid")
830
1106
__init__ = _kwarg_init
832
1108
def delete(self):
833
1109
for part in self.parts:
835
1111
Store.of(self).remove(self)
837
1113
class TestSuiteVar(Storm):
838
"""A container for the arguments of a Test Suite"""
1114
"""A variable used by an exercise test suite.
1116
This may represent a function argument or a normal variable.
839
1119
__storm_table__ = "suite_variable"
840
1120
__storm_primary__ = "varid"
844
1124
var_name = Unicode()
845
1125
var_value = Unicode()
846
1126
var_type = Unicode()
849
1129
suite = Reference(suiteid, "TestSuite.suiteid")
851
1131
__init__ = _kwarg_init
853
1133
def delete(self):
854
1134
Store.of(self).remove(self)
856
1136
class TestCasePart(Storm):
857
"""A container for the test elements of a Test Case"""
1137
"""An actual piece of code to test an exercise solution."""
858
1139
__storm_table__ = "test_case_part"
859
1140
__storm_primary__ = "partid"
864
1145
part_type = Unicode()
865
1146
test_type = Unicode()
866
1147
data = Unicode()
867
1148
filename = Unicode()
869
1150
test = Reference(testid, "TestCase.testid")
871
1152
__init__ = _kwarg_init
873
1154
def delete(self):
874
1155
Store.of(self).remove(self)
added
removed
ivle/database.py
