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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('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.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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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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if not self.can_submit(principal, who):
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raise DeadlinePassed()
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self.deadline > datetime.datetime.now())
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def submit(self, principal, path, revision):
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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):
712
"""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(
748
id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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submissions = ReferenceSet(id, 'ProjectSubmission.assessed_id')
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518
def __repr__(self):
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return "<%s %r in %r>" % (type(self).__name__,
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520
self.user or self.project_group, self.project)
756
"""True if the Assessed is a group, False if it is a user."""
757
return self.project_group is not None
761
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
766
assessment, relative to each group member's home directory."""
767
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):
776
"""Find or create an Assessed for the given user or group and project.
778
@param principal: The user or group.
779
@param project: The project.
781
524
t = type(principal)
782
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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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553
approver = Reference(approver_id, User.id)
816
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notes = Unicode()
818
class SubmissionError(Exception):
819
"""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
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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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assessed = Reference(assessed_id, Assessed.id)
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submitter_id = Int(name="submitter")
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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):
844
"""Get the URL for verifying this submission, within the account of
846
# If this is a solo project, then self.path will be prefixed with the
847
# subject name. Remove the first path segment.
848
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:
851
submitpath = submitpath.split('/', 1)[1]
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return "/files/%s/%s/%s?r=%d" % (user.login,
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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
860
injections using malicious paths.
861
Returns the updated path, if successful.
862
Raises SubmissionError if invalid.
864
# Ensure the path is absolute to prevent being tacked onto working
866
# 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
869
# Normalise to avoid resulting in ".." path segments.
870
if not os.path.isabs(path):
871
raise SubmissionError("Path is not absolute")
872
if any(c in path for c in "\n[]"):
873
raise SubmissionError("Path must not contain '\\n', '[' or ']'")
874
return os.path.normpath(path)
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567
# WORKSHEETS AND EXERCISES #
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569
class Exercise(Storm):
879
"""An exercise for students to complete in a worksheet.
881
An exercise may be present in any number of worksheets.
884
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__storm_table__ = "exercise"
885
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id = Unicode(primary=True, name="identifier")
908
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def __repr__(self):
909
595
return "<%s %s>" % (type(self).__name__, self.name)
911
def get_permissions(self, user, config):
912
return self.global_permissions(user, config)
915
def global_permissions(user, config):
916
"""Gets the set of permissions this user has over *all* exercises.
917
This is used to determine who may view the exercises list, and create
597
def get_permissions(self, user):
921
600
if user is not None:
923
602
perms.add('edit')
924
603
perms.add('view')
925
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
928
elif (config['policy']['tutors_can_edit_worksheets']
929
and u'tutor' in set((e.role for e in user.active_enrolments))):
930
# Site-specific policy on the role of tutors
604
elif 'lecturer' in set((e.role for e in user.active_enrolments)):
936
610
def get_description(self):
937
"""Return the description interpreted as reStructuredText."""
938
611
return rst(self.description)
940
613
def delete(self):
981
649
def __repr__(self):
982
650
return "<%s %s>" % (type(self).__name__, self.name)
652
# XXX Refactor this - make it an instance method of Subject rather than a
653
# class method of Worksheet. Can't do that now because Subject isn't
654
# linked referentially to the Worksheet.
656
def get_by_name(cls, store, subjectname, worksheetname):
658
Get the Worksheet from the db associated with a given store, subject
659
name and worksheet name.
661
return store.find(cls, cls.subject == unicode(subjectname),
662
cls.name == unicode(worksheetname)).one()
984
664
def remove_all_exercises(self):
985
"""Remove all exercises from this worksheet.
666
Remove all exercises from this worksheet.
987
667
This does not delete the exercises themselves. It just removes them
988
668
from the worksheet.
993
673
raise IntegrityError()
994
674
store.find(WorksheetExercise,
995
675
WorksheetExercise.worksheet == self).remove()
997
def get_permissions(self, user, config):
998
# Almost the same permissions as for the offering itself
999
perms = self.offering.get_permissions(user, config)
1000
# However, "edit" permission is derived from the "edit_worksheets"
1001
# permission of the offering
1002
if 'edit_worksheets' in perms:
1005
perms.discard('edit')
677
def get_permissions(self, user):
678
return self.offering.get_permissions(user)
1008
680
def get_xml(self):
1009
681
"""Returns the xml of this worksheet, converts from rst if required."""
1010
682
if self.format == u'rst':
1014
686
return self.data
1016
688
def delete(self):
1017
689
"""Deletes the worksheet, provided it has no attempts on any exercises.
1019
691
Returns True if delete succeeded, or False if this worksheet has
1020
692
attempts attached."""
1021
693
for ws_ex in self.all_worksheet_exercises:
1022
694
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
1023
695
raise IntegrityError()
1025
697
self.remove_all_exercises()
1026
698
Store.of(self).remove(self)
1028
700
class WorksheetExercise(Storm):
1029
"""A link between a worksheet and one of its exercises.
1031
These may be marked optional, in which case the exercise does not count
1032
for marking purposes. The sequence number is used to order the worksheet
1036
701
__storm_table__ = "worksheet_exercise"
1038
703
id = Int(primary=True, name="ws_ex_id")
1040
705
worksheet_id = Int(name="worksheetid")
1054
719
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
1055
720
self.worksheet.identifier)
1057
def get_permissions(self, user, config):
1058
return self.worksheet.get_permissions(user, config)
722
def get_permissions(self, user):
723
return self.worksheet.get_permissions(user)
1061
726
class ExerciseSave(Storm):
1062
"""A potential exercise solution submitted by a user for storage.
1064
This is not an actual tested attempt at an exercise, it's just a save of
1065
the editing session.
728
Represents a potential solution to an exercise that a user has submitted
729
to the server for storage.
730
A basic ExerciseSave is just the current saved text for this exercise for
731
this user (doesn't count towards their attempts).
732
ExerciseSave may be extended with additional semantics (such as
1068
735
__storm_table__ = "exercise_save"
1069
736
__storm_primary__ = "ws_ex_id", "user_id"
1083
750
self.exercise.name, self.user.login, self.date.strftime("%c"))
1085
752
class ExerciseAttempt(ExerciseSave):
1086
"""An attempt at solving an exercise.
1088
This is a special case of ExerciseSave, used when the user submits a
1089
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1092
In addition, it contains information about the result of the submission:
1094
- complete - True if this submission was successful, rendering this
1095
exercise complete for this user in this worksheet.
1096
- active - True if this submission is "active" (usually true).
1097
Submissions may be de-activated by privileged users for
1098
special reasons, and then they won't count (either as a
1099
penalty or success), but will still be stored.
754
An ExerciseAttempt is a special case of an ExerciseSave. Like an
755
ExerciseSave, it constitutes exercise solution data that the user has
756
submitted to the server for storage.
757
In addition, it contains additional information about the submission.
758
complete - True if this submission was successful, rendering this exercise
759
complete for this user.
760
active - True if this submission is "active" (usually true). Submissions
761
may be de-activated by privileged users for special reasons, and then
762
they won't count (either as a penalty or success), but will still be
1102
765
__storm_table__ = "exercise_attempt"
1103
766
__storm_primary__ = "ws_ex_id", "user_id", "date"
1107
770
text = Unicode(name="attempt")
1108
771
complete = Bool()
1111
def get_permissions(self, user, config):
774
def get_permissions(self, user):
1112
775
return set(['view']) if user is self.user else set()
1114
777
class TestSuite(Storm):
1115
"""A container to group an exercise's test cases.
1117
The test suite contains some information on how to test. The function to
1118
test, variables to set and stdin data are stored here.
778
"""A Testsuite acts as a container for the test cases of an exercise."""
1121
779
__storm_table__ = "test_suite"
1122
780
__storm_primary__ = "exercise_id", "suiteid"
1125
783
exercise_id = Unicode(name="exerciseid")
1126
784
description = Unicode()
1130
788
exercise = Reference(exercise_id, Exercise.id)
1131
789
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1132
790
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1134
792
def delete(self):
1135
793
"""Delete this suite, without asking questions."""
1136
for variable in self.variables:
794
for vaariable in self.variables:
1137
795
variable.delete()
1138
796
for test_case in self.test_cases:
1139
797
test_case.delete()
1140
798
Store.of(self).remove(self)
1142
800
class TestCase(Storm):
1143
"""A container for actual tests (see TestCasePart), inside a test suite.
1145
It is the lowest level shown to students on their pass/fail status."""
801
"""A TestCase is a member of a TestSuite.
803
It contains the data necessary to check if an exercise is correct"""
1147
804
__storm_table__ = "test_case"
1148
805
__storm_primary__ = "testid", "suiteid"
1152
809
suite = Reference(suiteid, "TestSuite.suiteid")
1153
810
passmsg = Unicode()
1154
811
failmsg = Unicode()
1155
test_default = Unicode() # Currently unused - only used for file matching.
812
test_default = Unicode()
1158
815
parts = ReferenceSet(testid, "TestCasePart.testid")
1160
817
__init__ = _kwarg_init
1162
819
def delete(self):
1163
820
for part in self.parts:
1165
822
Store.of(self).remove(self)
1167
824
class TestSuiteVar(Storm):
1168
"""A variable used by an exercise test suite.
1170
This may represent a function argument or a normal variable.
825
"""A container for the arguments of a Test Suite"""
1173
826
__storm_table__ = "suite_variable"
1174
827
__storm_primary__ = "varid"
1178
831
var_name = Unicode()
1179
832
var_value = Unicode()
1180
833
var_type = Unicode()
1183
836
suite = Reference(suiteid, "TestSuite.suiteid")
1185
838
__init__ = _kwarg_init
1187
840
def delete(self):
1188
841
Store.of(self).remove(self)
1190
843
class TestCasePart(Storm):
1191
"""An actual piece of code to test an exercise solution."""
844
"""A container for the test elements of a Test Case"""
1193
845
__storm_table__ = "test_case_part"
1194
846
__storm_primary__ = "partid"
1199
851
part_type = Unicode()
1200
852
test_type = Unicode()
1201
853
data = Unicode()
1202
854
filename = Unicode()
1204
856
test = Reference(testid, "TestCase.testid")
1206
858
__init__ = _kwarg_init
1208
860
def delete(self):
1209
861
Store.of(self).remove(self)
added
removed
ivle/database.py
