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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', 'edit', 'submit_project'])
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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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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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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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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.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):
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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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"""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(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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# Note: Table "problem" is called "Exercise" in the Object layer, since
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# it's called that everywhere else.
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__storm_table__ = "problem"
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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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id = Unicode(primary=True, name="identifier")
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description = Unicode()
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include = Unicode()
736
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, 'TestSuite.exercise_id')
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test_suites = ReferenceSet(id,
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'TestSuite.exercise_id',
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__init__ = _kwarg_init
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751
def __repr__(self):
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return "<%s %s>" % (type(self).__name__, self.name)
754
def get_permissions(self, user):
761
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
764
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."""
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return rst(self.description)
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"""Deletes the exercise, providing it has no associated worksheets."""
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if (self.worksheet_exercises.count() > 0):
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raise IntegrityError()
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for suite in self.test_suites:
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Store.of(self).remove(self)
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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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attempts = ReferenceSet(id, "ExerciseAttempt.worksheetid")
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offering = Reference(offering_id, 'Offering.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
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all_worksheet_exercises = ReferenceSet(id,
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'WorksheetExercise.worksheet_id')
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# Use worksheet_exercises to get access to the *active* WorksheetExercise
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# objects binding worksheets to exercises. This is required to access the
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807
# "optional" field.
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worksheet_exercises = ReferenceSet(id,
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'WorksheetExercise.worksheet_id')
810
def worksheet_exercises(self):
811
return self.all_worksheet_exercises.find(active=True)
460
813
__init__ = _kwarg_init
462
815
def __repr__(self):
463
816
return "<%s %s>" % (type(self).__name__, self.name)
465
# XXX Refactor this - make it an instance method of Subject rather than a
466
# class method of Worksheet. Can't do that now because Subject isn't
467
# linked referentially to the Worksheet.
469
def get_by_name(cls, store, subjectname, worksheetname):
471
Get the Worksheet from the db associated with a given store, subject
472
name and worksheet name.
474
return store.find(cls, cls.subject == unicode(subjectname),
475
cls.name == unicode(worksheetname)).one()
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def remove_all_exercises(self):
819
"""Remove all exercises from this worksheet.
477
def remove_all_exercises(self, store):
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Remove all exercises from this worksheet.
480
821
This does not delete the exercises themselves. It just removes them
481
822
from the worksheet.
824
store = Store.of(self)
825
for ws_ex in self.all_worksheet_exercises:
826
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
827
raise IntegrityError()
483
828
store.find(WorksheetExercise,
484
829
WorksheetExercise.worksheet == self).remove()
486
831
def get_permissions(self, user):
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832
return self.offering.get_permissions(user)
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"""Returns the xml of this worksheet, converts from rst if required."""
836
if self.format == u'rst':
837
ws_xml = rst(self.data)
843
"""Deletes the worksheet, provided it has no attempts on any exercises.
845
Returns True if delete succeeded, or False if this worksheet has
846
attempts attached."""
847
for ws_ex in self.all_worksheet_exercises:
848
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
849
raise IntegrityError()
851
self.remove_all_exercises()
852
Store.of(self).remove(self)
489
854
class WorksheetExercise(Storm):
490
__storm_table__ = "worksheet_problem"
492
id = Int(primary=True, name="ws_prob_id")
855
"""A link between a worksheet and one of its exercises.
857
These may be marked optional, in which case the exercise does not count
858
for marking purposes. The sequence number is used to order the worksheet
862
__storm_table__ = "worksheet_exercise"
864
id = Int(primary=True, name="ws_ex_id")
494
866
worksheet_id = Int(name="worksheetid")
495
867
worksheet = Reference(worksheet_id, Worksheet.id)
496
exercise_id = Unicode(name="problemid")
868
exercise_id = Unicode(name="exerciseid")
497
869
exercise = Reference(exercise_id, Exercise.id)
498
870
optional = Bool()
502
874
saves = ReferenceSet(id, "ExerciseSave.ws_ex_id")
503
875
attempts = ReferenceSet(id, "ExerciseAttempt.ws_ex_id")
508
880
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
509
881
self.worksheet.identifier)
883
def get_permissions(self, user):
884
return self.worksheet.get_permissions(user)
511
887
class ExerciseSave(Storm):
513
Represents a potential solution to an exercise that a user has submitted
514
to the server for storage.
515
A basic ExerciseSave is just the current saved text for this exercise for
516
this user (doesn't count towards their attempts).
517
ExerciseSave may be extended with additional semantics (such as
520
__storm_table__ = "problem_save"
888
"""A potential exercise solution submitted by a user for storage.
890
This is not an actual tested attempt at an exercise, it's just a save of
894
__storm_table__ = "exercise_save"
521
895
__storm_primary__ = "ws_ex_id", "user_id"
523
ws_ex_id = Int(name="ws_prob_id")
897
ws_ex_id = Int(name="ws_ex_id")
524
898
worksheet_exercise = Reference(ws_ex_id, "WorksheetExercise.id")
526
900
user_id = Int(name="loginid")
535
909
self.exercise.name, self.user.login, self.date.strftime("%c"))
537
911
class ExerciseAttempt(ExerciseSave):
539
An ExerciseAttempt is a special case of an ExerciseSave. Like an
540
ExerciseSave, it constitutes exercise solution data that the user has
541
submitted to the server for storage.
542
In addition, it contains additional information about the submission.
543
complete - True if this submission was successful, rendering this exercise
544
complete for this user.
545
active - True if this submission is "active" (usually true). Submissions
546
may be de-activated by privileged users for special reasons, and then
547
they won't count (either as a penalty or success), but will still be
550
__storm_table__ = "problem_attempt"
912
"""An attempt at solving an exercise.
914
This is a special case of ExerciseSave, used when the user submits a
915
candidate solution. Like an ExerciseSave, it constitutes exercise solution
918
In addition, it contains information about the result of the submission:
920
- complete - True if this submission was successful, rendering this
921
exercise complete for this user in this worksheet.
922
- active - True if this submission is "active" (usually true).
923
Submissions may be de-activated by privileged users for
924
special reasons, and then they won't count (either as a
925
penalty or success), but will still be stored.
928
__storm_table__ = "exercise_attempt"
551
929
__storm_primary__ = "ws_ex_id", "user_id", "date"
553
931
# The "text" field is the same but has a different name in the DB table
555
933
text = Unicode(name="attempt")
556
934
complete = Bool()
559
937
def get_permissions(self, user):
560
938
return set(['view']) if user is self.user else set()
562
940
class TestSuite(Storm):
563
"""A Testsuite acts as a container for the test cases of an exercise."""
941
"""A container to group an exercise's test cases.
943
The test suite contains some information on how to test. The function to
944
test, variables to set and stdin data are stored here.
564
947
__storm_table__ = "test_suite"
565
948
__storm_primary__ = "exercise_id", "suiteid"
568
exercise_id = Unicode(name="problemid")
951
exercise_id = Unicode(name="exerciseid")
569
952
description = Unicode()
571
954
function = Unicode()
572
955
stdin = Unicode()
573
956
exercise = Reference(exercise_id, Exercise.id)
574
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
575
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid')
957
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
958
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
961
"""Delete this suite, without asking questions."""
962
for vaariable in self.variables:
964
for test_case in self.test_cases:
966
Store.of(self).remove(self)
577
968
class TestCase(Storm):
578
"""A TestCase is a member of a TestSuite.
580
It contains the data necessary to check if an exercise is correct"""
969
"""A container for actual tests (see TestCasePart), inside a test suite.
971
It is the lowest level shown to students on their pass/fail status."""
581
973
__storm_table__ = "test_case"
582
974
__storm_primary__ = "testid", "suiteid"
586
978
suite = Reference(suiteid, "TestSuite.suiteid")
588
980
failmsg = Unicode()
589
981
test_default = Unicode()
592
984
parts = ReferenceSet(testid, "TestCasePart.testid")
594
986
__init__ = _kwarg_init
989
for part in self.parts:
991
Store.of(self).remove(self)
596
993
class TestSuiteVar(Storm):
597
"""A container for the arguments of a Test Suite"""
598
__storm_table__ = "suite_variables"
994
"""A variable used by an exercise test suite.
996
This may represent a function argument or a normal variable.
999
__storm_table__ = "suite_variable"
599
1000
__storm_primary__ = "varid"
603
1004
var_name = Unicode()
604
1005
var_value = Unicode()
605
1006
var_type = Unicode()
608
1009
suite = Reference(suiteid, "TestSuite.suiteid")
610
1011
__init__ = _kwarg_init
1014
Store.of(self).remove(self)
612
1016
class TestCasePart(Storm):
613
"""A container for the test elements of a Test Case"""
614
__storm_table__ = "test_case_parts"
1017
"""An actual piece of code to test an exercise solution."""
1019
__storm_table__ = "test_case_part"
615
1020
__storm_primary__ = "partid"
620
1025
part_type = Unicode()
621
1026
test_type = Unicode()
622
1027
data = Unicode()
623
1028
filename = Unicode()
625
1030
test = Reference(testid, "TestCase.testid")
627
1032
__init__ = _kwarg_init
1035
Store.of(self).remove(self)
added
removed
ivle/database.py
