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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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'Subject', 'Semester', 'Offering', 'Enrolment',
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'ProjectSet', 'Project', 'ProjectGroup', 'ProjectGroupMembership',
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'Assessed', 'ProjectSubmission', 'ProjectExtension',
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'Exercise', 'Worksheet', 'WorksheetExercise',
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'ExerciseSave', 'ExerciseAttempt',
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'AlreadyEnrolledError', 'TestCase', 'TestSuite', 'TestSuiteVar'
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'TestCase', 'TestSuite', 'TestSuiteVar'
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def _kwarg_init(self, **kwargs):
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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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passhash = Unicode()
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pass_exp = DateTime()
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'''A sanely ordered list of all of the user's enrolments.'''
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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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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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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.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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def hash_password(password):
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return md5.md5(password).hexdigest()
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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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if user and user.rolenm == 'admin' or user is self:
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return set(['view', 'edit'])
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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_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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return "<%s '%s'>" % (type(self).__name__, self.short_name)
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def get_permissions(self, user):
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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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if user.rolenm == 'admin':
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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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semester = Unicode()
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offerings = ReferenceSet(id, 'Offering.semester_id')
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enrolments = ReferenceSet(id,
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'Offering.semester_id',
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'Enrolment.offering_id')
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__init__ = _kwarg_init
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return "<%s %r in %r>" % (type(self).__name__, self.subject,
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def enrol(self, user):
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'''Enrol a user in this offering.'''
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# We'll get a horrible database constraint violation error if we try
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# to add a second enrolment.
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if Store.of(self).find(Enrolment,
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Enrolment.user_id == user.id,
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Enrolment.offering_id == self.id).count() == 1:
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raise AlreadyEnrolledError()
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e = Enrolment(user=user, offering=self, active=True)
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self.enrolments.add(e)
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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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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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if enrolment is None:
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enrolment = Enrolment(user=user, offering=self)
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self.enrolments.add(enrolment)
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enrolment.active = True
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enrolment.role = role
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def unenrol(self, user):
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'''Unenrol a user from 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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Store.of(enrolment).remove(enrolment)
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def get_permissions(self, user):
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if user is not None:
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if user.rolenm == 'admin':
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enrolment = self.get_enrolment(user)
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if enrolment or user.admin:
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if (enrolment and enrolment.role in (u'tutor', u'lecturer')) \
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perms.add('edit')
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if (enrolment and enrolment.role in (u'lecturer')) or user.admin:
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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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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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return "<%s %d in %r>" % (type(self).__name__, self.id,
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def get_permissions(self, user):
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return self.offering.get_permissions(user)
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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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short_name = Unicode()
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synopsis = Unicode()
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project_set_id = Int(name="projectsetid")
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project_set = Reference(project_set_id, ProjectSet.id)
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deadline = DateTime()
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assesseds = ReferenceSet(id, 'Assessed.project_id')
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submissions = ReferenceSet(id,
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'Assessed.project_id',
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'ProjectSubmission.assessed_id')
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__init__ = _kwarg_init
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def __repr__(self):
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return "<%s '%s' in %r>" % (type(self).__name__, self.synopsis,
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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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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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a = Assessed.get(Store.of(self), principal, self)
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ps = ProjectSubmission()
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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):
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return self.project_set.offering.get_permissions(user)
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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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return "<%s %s in %r>" % (type(self).__name__, self.name,
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self.project_set.offering)
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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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def get_projects(self, offering=None, active_only=True):
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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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@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.id == self.project_set.id,
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ProjectSet.max_students_per_group != None,
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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):
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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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return "<%s %r in %r>" % (type(self).__name__, self.user,
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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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user_id = Int(name="loginid")
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user = Reference(user_id, User.id)
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project_group_id = Int(name="groupid")
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project_group = Reference(project_group_id, ProjectGroup.id)
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project_id = Int(name="projectid")
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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')
708
return "<%s %r in %r>" % (type(self).__name__,
709
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."""
714
return self.project_group is not None
718
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
723
assessment, relative to each group member's home directory."""
724
subjectname = self.project.project_set.offering.subject.short_name
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checkout_dir_name = self.principal.short_name
728
checkout_dir_name = "mywork"
729
return subjectname + "/" + checkout_dir_name
732
def get(cls, store, principal, project):
733
"""Find or create an Assessed for the given user or group and project.
735
@param principal: The user or group.
736
@param project: The project.
739
if t not in (User, ProjectGroup):
740
raise AssertionError('principal must be User or ProjectGroup')
743
(t is User) or (cls.project_group_id == principal.id),
744
(t is ProjectGroup) or (cls.user_id == principal.id),
745
cls.project_id == project.id).one()
752
a.project_group = principal
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class ProjectExtension(Storm):
760
"""An extension granted to a user or group on a particular project.
762
The user or group and project are specified by the Assessed.
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__storm_table__ = "project_extension"
767
id = Int(name="extensionid", primary=True)
768
assessed_id = Int(name="assessedid")
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assessed = Reference(assessed_id, Assessed.id)
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deadline = DateTime()
771
approver_id = Int(name="approver")
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approver = Reference(approver_id, User.id)
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class ProjectSubmission(Storm):
776
"""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
780
group, while the path and revision are explicit.
782
The user or group and project are specified by the Assessed.
785
__storm_table__ = "project_submission"
787
id = Int(name="submissionid", primary=True)
788
assessed_id = Int(name="assessedid")
789
assessed = Reference(assessed_id, Assessed.id)
792
submitter_id = Int(name="submitter")
793
submitter = Reference(submitter_id, User.id)
794
date_submitted = DateTime()
796
def get_verify_url(self, user):
797
"""Get the URL for verifying this submission, within the account of
799
# If this is a solo project, then self.path will be prefixed with the
800
# subject name. Remove the first path segment.
801
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
802
if not self.assessed.is_group:
803
if '/' in submitpath:
804
submitpath = submitpath.split('/', 1)[1]
807
return "/files/%s/%s/%s?r=%d" % (user.login,
808
self.assessed.checkout_location, submitpath, self.revision)
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810
# WORKSHEETS AND EXERCISES #
412
812
class Exercise(Storm):
813
"""An exercise for students to complete in a worksheet.
815
An exercise may be present in any number of worksheets.
413
818
__storm_table__ = "exercise"
414
819
id = Unicode(primary=True, name="identifier")
419
824
include = Unicode()
827
worksheet_exercises = ReferenceSet(id,
828
'WorksheetExercise.exercise_id')
422
830
worksheets = ReferenceSet(id,
423
831
'WorksheetExercise.exercise_id',
424
832
'WorksheetExercise.worksheet_id',
428
test_suites = ReferenceSet(id, 'TestSuite.exercise_id')
836
test_suites = ReferenceSet(id,
837
'TestSuite.exercise_id',
430
840
__init__ = _kwarg_init
432
842
def __repr__(self):
433
843
return "<%s %s>" % (type(self).__name__, self.name)
845
def get_permissions(self, user):
846
return self.global_permissions(user)
849
def global_permissions(user):
850
"""Gets the set of permissions this user has over *all* exercises.
851
This is used to determine who may view the exercises list, and create
859
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
862
elif u'tutor' in set((e.role for e in user.active_enrolments)):
868
def get_description(self):
869
"""Return the description interpreted as reStructuredText."""
870
return rst(self.description)
873
"""Deletes the exercise, providing it has no associated worksheets."""
874
if (self.worksheet_exercises.count() > 0):
875
raise IntegrityError()
876
for suite in self.test_suites:
878
Store.of(self).remove(self)
436
880
class Worksheet(Storm):
881
"""A worksheet with exercises for students to complete.
883
Worksheets are owned by offerings.
437
886
__storm_table__ = "worksheet"
439
888
id = Int(primary=True, name="worksheetid")
448
897
attempts = ReferenceSet(id, "ExerciseAttempt.worksheetid")
449
898
offering = Reference(offering_id, 'Offering.id')
451
# Use worksheet_exercises to get access to the WorksheetExercise objects
452
# binding worksheets to exercises. This is required to access the
900
all_worksheet_exercises = ReferenceSet(id,
901
'WorksheetExercise.worksheet_id')
903
# Use worksheet_exercises to get access to the *active* WorksheetExercise
904
# objects binding worksheets to exercises. This is required to access the
453
905
# "optional" field.
454
worksheet_exercises = ReferenceSet(id,
455
'WorksheetExercise.worksheet_id')
908
def worksheet_exercises(self):
909
return self.all_worksheet_exercises.find(active=True)
458
911
__init__ = _kwarg_init
460
913
def __repr__(self):
461
914
return "<%s %s>" % (type(self).__name__, self.name)
463
# XXX Refactor this - make it an instance method of Subject rather than a
464
# class method of Worksheet. Can't do that now because Subject isn't
465
# linked referentially to the Worksheet.
467
def get_by_name(cls, store, subjectname, worksheetname):
469
Get the Worksheet from the db associated with a given store, subject
470
name and worksheet name.
472
return store.find(cls, cls.subject == unicode(subjectname),
473
cls.name == unicode(worksheetname)).one()
916
def remove_all_exercises(self):
917
"""Remove all exercises from this worksheet.
475
def remove_all_exercises(self, store):
477
Remove all exercises from this worksheet.
478
919
This does not delete the exercises themselves. It just removes them
479
920
from the worksheet.
922
store = Store.of(self)
923
for ws_ex in self.all_worksheet_exercises:
924
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
925
raise IntegrityError()
481
926
store.find(WorksheetExercise,
482
927
WorksheetExercise.worksheet == self).remove()
484
929
def get_permissions(self, user):
485
930
return self.offering.get_permissions(user)
933
"""Returns the xml of this worksheet, converts from rst if required."""
934
if self.format == u'rst':
935
ws_xml = rst(self.data)
941
"""Deletes the worksheet, provided it has no attempts on any exercises.
943
Returns True if delete succeeded, or False if this worksheet has
944
attempts attached."""
945
for ws_ex in self.all_worksheet_exercises:
946
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
947
raise IntegrityError()
949
self.remove_all_exercises()
950
Store.of(self).remove(self)
487
952
class WorksheetExercise(Storm):
953
"""A link between a worksheet and one of its exercises.
955
These may be marked optional, in which case the exercise does not count
956
for marking purposes. The sequence number is used to order the worksheet
488
960
__storm_table__ = "worksheet_exercise"
490
962
id = Int(primary=True, name="ws_ex_id")
492
964
worksheet_id = Int(name="worksheetid")
506
978
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
507
979
self.worksheet.identifier)
981
def get_permissions(self, user):
982
return self.worksheet.get_permissions(user)
509
985
class ExerciseSave(Storm):
511
Represents a potential solution to an exercise that a user has submitted
512
to the server for storage.
513
A basic ExerciseSave is just the current saved text for this exercise for
514
this user (doesn't count towards their attempts).
515
ExerciseSave may be extended with additional semantics (such as
986
"""A potential exercise solution submitted by a user for storage.
988
This is not an actual tested attempt at an exercise, it's just a save of
518
992
__storm_table__ = "exercise_save"
519
993
__storm_primary__ = "ws_ex_id", "user_id"
533
1007
self.exercise.name, self.user.login, self.date.strftime("%c"))
535
1009
class ExerciseAttempt(ExerciseSave):
537
An ExerciseAttempt is a special case of an ExerciseSave. Like an
538
ExerciseSave, it constitutes exercise solution data that the user has
539
submitted to the server for storage.
540
In addition, it contains additional information about the submission.
541
complete - True if this submission was successful, rendering this exercise
542
complete for this user.
543
active - True if this submission is "active" (usually true). Submissions
544
may be de-activated by privileged users for special reasons, and then
545
they won't count (either as a penalty or success), but will still be
1010
"""An attempt at solving an exercise.
1012
This is a special case of ExerciseSave, used when the user submits a
1013
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1016
In addition, it contains information about the result of the submission:
1018
- complete - True if this submission was successful, rendering this
1019
exercise complete for this user in this worksheet.
1020
- active - True if this submission is "active" (usually true).
1021
Submissions may be de-activated by privileged users for
1022
special reasons, and then they won't count (either as a
1023
penalty or success), but will still be stored.
548
1026
__storm_table__ = "exercise_attempt"
549
1027
__storm_primary__ = "ws_ex_id", "user_id", "date"
569
1052
function = Unicode()
570
1053
stdin = Unicode()
571
1054
exercise = Reference(exercise_id, Exercise.id)
572
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
573
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid')
1055
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1056
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1059
"""Delete this suite, without asking questions."""
1060
for variable in self.variables:
1062
for test_case in self.test_cases:
1064
Store.of(self).remove(self)
575
1066
class TestCase(Storm):
576
"""A TestCase is a member of a TestSuite.
578
It contains the data necessary to check if an exercise is correct"""
1067
"""A container for actual tests (see TestCasePart), inside a test suite.
1069
It is the lowest level shown to students on their pass/fail status."""
579
1071
__storm_table__ = "test_case"
580
1072
__storm_primary__ = "testid", "suiteid"
584
1076
suite = Reference(suiteid, "TestSuite.suiteid")
585
1077
passmsg = Unicode()
586
1078
failmsg = Unicode()
587
test_default = Unicode()
1079
test_default = Unicode() # Currently unused - only used for file matching.
590
1082
parts = ReferenceSet(testid, "TestCasePart.testid")
592
1084
__init__ = _kwarg_init
1087
for part in self.parts:
1089
Store.of(self).remove(self)
594
1091
class TestSuiteVar(Storm):
595
"""A container for the arguments of a Test Suite"""
1092
"""A variable used by an exercise test suite.
1094
This may represent a function argument or a normal variable.
596
1097
__storm_table__ = "suite_variable"
597
1098
__storm_primary__ = "varid"
601
1102
var_name = Unicode()
602
1103
var_value = Unicode()
603
1104
var_type = Unicode()
606
1107
suite = Reference(suiteid, "TestSuite.suiteid")
608
1109
__init__ = _kwarg_init
1112
Store.of(self).remove(self)
610
1114
class TestCasePart(Storm):
611
"""A container for the test elements of a Test Case"""
1115
"""An actual piece of code to test an exercise solution."""
612
1117
__storm_table__ = "test_case_part"
613
1118
__storm_primary__ = "partid"
618
1123
part_type = Unicode()
619
1124
test_type = Unicode()
620
1125
data = Unicode()
621
1126
filename = Unicode()
623
1128
test = Reference(testid, "TestCase.testid")
625
1130
__init__ = _kwarg_init
1133
Store.of(self).remove(self)
added
removed
ivle/database.py
