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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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'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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'TestCase', 'TestSuite', 'TestSuiteVar'
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'AlreadyEnrolledError', 'TestCase', 'TestSuite'
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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(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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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 = 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, 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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def get_conn_string():
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Returns the Storm connection string, generated from the conf file.
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return "postgres://%s:%s@%s:%d/%s" % (ivle.conf.db_user,
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ivle.conf.db_password, ivle.conf.db_host, ivle.conf.db_port,
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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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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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"""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):
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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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if user and user.rolenm == 'admin' or user is self:
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return set(['view', 'edit'])
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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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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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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, 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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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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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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return self.get_members_by_role(u'student')
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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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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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"""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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if self.max_students_per_group is None:
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return self.offering.students
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return self.project_groups
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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.short_name,
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return "<%s '%s' in %r>" % (type(self).__name__, self.synopsis,
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self.project_set.offering)
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def can_submit(self, principal):
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return (self in principal.get_projects() and
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self.deadline > datetime.datetime.now())
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def submit(self, principal, path, revision, who):
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"""Submit a Subversion path and revision to a project.
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@param principal: The owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made
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@param path: A path within that repository to submit.
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@param revision: The revision of that path to submit.
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@param who: The user who is actually making the submission.
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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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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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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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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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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(id, 'ProjectSubmission.assessed_id')
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return "<%s %r in %r>" % (type(self).__name__,
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self.user or self.project_group, self.project)
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"""True if the Assessed is a group, False if it is a user."""
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return self.project_group is not None
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return self.project_group or self.user
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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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if t not in (User, ProjectGroup):
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raise AssertionError('principal must be User or ProjectGroup')
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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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a.project_group = principal
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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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assessed_id = Int(name="assessedid")
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assessed = Reference(assessed_id, Assessed.id)
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deadline = DateTime()
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approver_id = Int(name="approver")
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approver = Reference(approver_id, User.id)
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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_id = Int(name="assessedid")
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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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# WORKSHEETS AND EXERCISES #
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class Exercise(Storm):
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"""An exercise for students to complete in a worksheet.
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An exercise may be present in any number of worksheets.
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__storm_table__ = "exercise"
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# Note: Table "problem" is called "Exercise" in the Object layer, since
388
# it's called that everywhere else.
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__storm_table__ = "problem"
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#TODO: Add in a field for the user-friendly identifier
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id = Unicode(primary=True, name="identifier")
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description = Unicode()
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include = Unicode()
724
worksheet_exercises = ReferenceSet(id,
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'WorksheetExercise.exercise_id')
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worksheets = ReferenceSet(id,
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'WorksheetExercise.exercise_id',
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'WorksheetExercise.worksheet_id',
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test_suites = ReferenceSet(id,
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'TestSuite.exercise_id',
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test_suites = ReferenceSet(id, 'TestSuite.exercise_id')
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__init__ = _kwarg_init
739
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def __repr__(self):
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410
return "<%s %s>" % (type(self).__name__, self.name)
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def get_permissions(self, user):
749
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
752
elif u'tutor' in set((e.role for e in user.active_enrolments)):
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def get_description(self):
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"""Return the description interpreted as reStructuredText."""
760
return rst(self.description)
763
"""Deletes the exercise, providing it has no associated worksheets."""
764
if (self.worksheet_exercises.count() > 0):
765
raise IntegrityError()
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for suite in self.test_suites:
768
Store.of(self).remove(self)
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def get_by_name(cls, store, name):
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Get the Exercise from the db associated with a given store and name.
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If the exercise is not in the database, creates it and inserts it
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ex = store.find(cls, cls.name == unicode(name)).one()
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ex = Exercise(name=unicode(name))
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class Worksheet(Storm):
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"""A worksheet with exercises for students to complete.
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Worksheets are owned by offerings.
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__storm_table__ = "worksheet"
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id = Int(primary=True, name="worksheetid")
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# XXX subject is not linked to a Subject object. This is a property of
432
# the database, and will be refactored.
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offering_id = Int(name="offeringid")
780
identifier = Unicode()
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name = Unicode(name="identifier")
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436
assessable = Bool()
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attempts = ReferenceSet(id, "ExerciseAttempt.worksheetid")
788
offering = Reference(offering_id, 'Offering.id')
790
all_worksheet_exercises = ReferenceSet(id,
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offering = Reference (offeringid, 'Offering.id')
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exercises = ReferenceSet(id,
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'WorksheetExercise.worksheet_id',
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'WorksheetExercise.exercise_id',
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# Use worksheet_exercises to get access to the WorksheetExercise objects
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# binding worksheets to exercises. This is required to access the
448
worksheet_exercises = ReferenceSet(id,
791
449
'WorksheetExercise.worksheet_id')
793
# Use worksheet_exercises to get access to the *active* WorksheetExercise
794
# objects binding worksheets to exercises. This is required to access the
798
def worksheet_exercises(self):
799
return self.all_worksheet_exercises.find(active=True)
801
452
__init__ = _kwarg_init
803
454
def __repr__(self):
804
455
return "<%s %s>" % (type(self).__name__, self.name)
806
def remove_all_exercises(self):
807
"""Remove all exercises from this worksheet.
457
# XXX Refactor this - make it an instance method of Subject rather than a
458
# class method of Worksheet. Can't do that now because Subject isn't
459
# linked referentially to the Worksheet.
461
def get_by_name(cls, store, subjectname, worksheetname):
463
Get the Worksheet from the db associated with a given store, subject
464
name and worksheet name.
466
return store.find(cls, cls.subject == unicode(subjectname),
467
cls.name == unicode(worksheetname)).one()
469
def remove_all_exercises(self, store):
471
Remove all exercises from this worksheet.
809
472
This does not delete the exercises themselves. It just removes them
810
473
from the worksheet.
812
store = Store.of(self)
813
for ws_ex in self.all_worksheet_exercises:
814
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
815
raise IntegrityError()
816
475
store.find(WorksheetExercise,
817
476
WorksheetExercise.worksheet == self).remove()
819
def get_permissions(self, user):
820
return self.offering.get_permissions(user)
823
"""Returns the xml of this worksheet, converts from rst if required."""
824
if self.format == u'rst':
825
ws_xml = rst(self.data)
831
"""Deletes the worksheet, provided it has no attempts on any exercises.
833
Returns True if delete succeeded, or False if this worksheet has
834
attempts attached."""
835
for ws_ex in self.all_worksheet_exercises:
836
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
837
raise IntegrityError()
839
self.remove_all_exercises()
840
Store.of(self).remove(self)
842
478
class WorksheetExercise(Storm):
843
"""A link between a worksheet and one of its exercises.
845
These may be marked optional, in which case the exercise does not count
846
for marking purposes. The sequence number is used to order the worksheet
850
__storm_table__ = "worksheet_exercise"
852
id = Int(primary=True, name="ws_ex_id")
479
__storm_table__ = "worksheet_problem"
480
__storm_primary__ = "worksheet_id", "exercise_id"
854
482
worksheet_id = Int(name="worksheetid")
855
483
worksheet = Reference(worksheet_id, Worksheet.id)
856
exercise_id = Unicode(name="exerciseid")
484
exercise_id = Unicode(name="problemid")
857
485
exercise = Reference(exercise_id, Exercise.id)
858
486
optional = Bool()
862
saves = ReferenceSet(id, "ExerciseSave.ws_ex_id")
863
attempts = ReferenceSet(id, "ExerciseAttempt.ws_ex_id")
865
488
__init__ = _kwarg_init
867
490
def __repr__(self):
868
491
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
869
self.worksheet.identifier)
871
def get_permissions(self, user):
872
return self.worksheet.get_permissions(user)
875
494
class ExerciseSave(Storm):
876
"""A potential exercise solution submitted by a user for storage.
878
This is not an actual tested attempt at an exercise, it's just a save of
882
__storm_table__ = "exercise_save"
883
__storm_primary__ = "ws_ex_id", "user_id"
885
ws_ex_id = Int(name="ws_ex_id")
886
worksheet_exercise = Reference(ws_ex_id, "WorksheetExercise.id")
496
Represents a potential solution to an exercise that a user has submitted
497
to the server for storage.
498
A basic ExerciseSave is just the current saved text for this exercise for
499
this user (doesn't count towards their attempts).
500
ExerciseSave may be extended with additional semantics (such as
503
__storm_table__ = "problem_save"
504
__storm_primary__ = "exercise_id", "user_id", "date"
506
exercise_id = Unicode(name="problemid")
507
exercise = Reference(exercise_id, Exercise.id)
888
508
user_id = Int(name="loginid")
889
509
user = Reference(user_id, User.id)
890
510
date = DateTime()
513
worksheet = Reference(worksheetid, Worksheet.id)
893
515
__init__ = _kwarg_init
897
519
self.exercise.name, self.user.login, self.date.strftime("%c"))
899
521
class ExerciseAttempt(ExerciseSave):
900
"""An attempt at solving an exercise.
902
This is a special case of ExerciseSave, used when the user submits a
903
candidate solution. Like an ExerciseSave, it constitutes exercise solution
906
In addition, it contains information about the result of the submission:
908
- complete - True if this submission was successful, rendering this
909
exercise complete for this user in this worksheet.
910
- active - True if this submission is "active" (usually true).
911
Submissions may be de-activated by privileged users for
912
special reasons, and then they won't count (either as a
913
penalty or success), but will still be stored.
916
__storm_table__ = "exercise_attempt"
917
__storm_primary__ = "ws_ex_id", "user_id", "date"
523
An ExerciseAttempt is a special case of an ExerciseSave. Like an
524
ExerciseSave, it constitutes exercise solution data that the user has
525
submitted to the server for storage.
526
In addition, it contains additional information about the submission.
527
complete - True if this submission was successful, rendering this exercise
528
complete for this user.
529
active - True if this submission is "active" (usually true). Submissions
530
may be de-activated by privileged users for special reasons, and then
531
they won't count (either as a penalty or success), but will still be
534
__storm_table__ = "problem_attempt"
535
__storm_primary__ = "exercise_id", "user_id", "date"
919
537
# The "text" field is the same but has a different name in the DB table
920
538
# for some reason.
921
539
text = Unicode(name="attempt")
922
540
complete = Bool()
925
543
def get_permissions(self, user):
926
544
return set(['view']) if user is self.user else set()
928
546
class TestSuite(Storm):
929
"""A container to group an exercise's test cases.
931
The test suite contains some information on how to test. The function to
932
test, variables to set and stdin data are stored here.
547
"""A Testsuite acts as a container for the test cases of an exercise."""
935
548
__storm_table__ = "test_suite"
936
549
__storm_primary__ = "exercise_id", "suiteid"
939
exercise_id = Unicode(name="exerciseid")
552
exercise_id = Unicode(name="problemid")
553
exercise = Reference(exercise_id, Exercise.id)
554
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
940
555
description = Unicode()
944
exercise = Reference(exercise_id, Exercise.id)
945
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
946
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
949
"""Delete this suite, without asking questions."""
950
for vaariable in self.variables:
952
for test_case in self.test_cases:
954
Store.of(self).remove(self)
956
558
class TestCase(Storm):
957
"""A container for actual tests (see TestCasePart), inside a test suite.
959
It is the lowest level shown to students on their pass/fail status."""
559
"""A TestCase is a member of a TestSuite.
561
It contains the data necessary to check if an exercise is correct"""
961
562
__storm_table__ = "test_case"
962
563
__storm_primary__ = "testid", "suiteid"
966
suite = Reference(suiteid, "TestSuite.suiteid")
567
suite = Reference(suiteid, TestSuite.suiteid)
967
568
passmsg = Unicode()
968
569
failmsg = Unicode()
969
test_default = Unicode()
571
code_type = Unicode()
972
parts = ReferenceSet(testid, "TestCasePart.testid")
974
__init__ = _kwarg_init
977
for part in self.parts:
979
Store.of(self).remove(self)
981
class TestSuiteVar(Storm):
982
"""A variable used by an exercise test suite.
984
This may represent a function argument or a normal variable.
987
__storm_table__ = "suite_variable"
988
__storm_primary__ = "varid"
993
var_value = Unicode()
997
suite = Reference(suiteid, "TestSuite.suiteid")
999
__init__ = _kwarg_init
1002
Store.of(self).remove(self)
1004
class TestCasePart(Storm):
1005
"""An actual piece of code to test an exercise solution."""
1007
__storm_table__ = "test_case_part"
1008
__storm_primary__ = "partid"
1013
part_type = Unicode()
1014
test_type = Unicode()
1016
filename = Unicode()
1018
test = Reference(testid, "TestCase.testid")
1020
__init__ = _kwarg_init
1023
Store.of(self).remove(self)
576
__init__ = _kwarg_init
added
removed
ivle/database.py
