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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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'TestCase', 'TestSuite', 'TestSuiteVar'
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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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'''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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Enrolment.active == True)
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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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def get_permissions(self, user, config):
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"""Determine privileges held by a user over this object.
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If the user requesting privileges is this user or an admin,
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they may do everything. Otherwise they may do nothing.
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if user and user.admin or user is self:
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return set(['view', 'edit'])
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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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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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enrolment.active = True
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enrolment.role = role
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def get_permissions(self, user):
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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, config):
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if user is not None:
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enrolment = self.get_enrolment(user)
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if enrolment or user.admin:
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if enrolment and enrolment.role == u'tutor':
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perms.add('view_project_submissions')
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# Site-specific policy on the role of tutors
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if config['policy']['tutors_can_enrol_students']:
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perms.add('enrol_student')
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if config['policy']['tutors_can_edit_worksheets']:
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perms.add('edit_worksheets')
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if config['policy']['tutors_can_admin_groups']:
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perms.add('admin_groups')
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if (enrolment and enrolment.role in (u'lecturer')) or user.admin:
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perms.add('view_project_submissions')
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perms.add('admin_groups')
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perms.add('edit_worksheets')
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perms.add('edit') # Can edit projects & details
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perms.add('enrol') # Can see enrolment screen at all
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perms.add('enrol_student') # Can enrol students
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perms.add('enrol_tutor') # Can enrol tutors
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perms.add('enrol_lecturer') # Can enrol lecturers
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def get_enrolment(self, user):
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"""Find the user's enrolment in this offering."""
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enrolment = self.enrolments.find(user=user).one()
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def get_members_by_role(self, role):
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return Store.of(self).find(User,
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Enrolment.user_id == User.id,
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Enrolment.offering_id == self.id,
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Enrolment.role == role
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).order_by(User.login)
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return self.get_members_by_role(u'student')
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def get_open_projects_for_user(self, user):
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"""Find all projects currently open to submissions by a user."""
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# XXX: Respect extensions.
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return self.projects.find(Project.deadline > datetime.datetime.now())
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def clone_worksheets(self, source):
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"""Clone all worksheets from the specified source to this offering."""
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import ivle.worksheet.utils
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for worksheet in source.worksheets:
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newws.seq_no = worksheet.seq_no
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newws.identifier = worksheet.identifier
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newws.name = worksheet.name
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newws.assessable = worksheet.assessable
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newws.data = worksheet.data
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newws.format = worksheet.format
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newws.offering = self
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Store.of(self).add(newws)
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ivle.worksheet.utils.update_exerciselist(newws)
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class Enrolment(Storm):
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"""An enrolment of a user in an offering.
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This represents the roles of both staff and students.
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__storm_table__ = "enrolment"
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__storm_primary__ = "user_id", "offering_id"
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return "<%s %d in %r>" % (type(self).__name__, self.id,
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def get_permissions(self, user, config):
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return self.offering.get_permissions(user, config)
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def get_groups_for_user(self, user):
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"""List all groups in this offering of which the user is a member."""
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return Store.of(self).find(
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ProjectGroupMembership.user_id == user.id,
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ProjectGroupMembership.project_group_id == ProjectGroup.id,
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ProjectGroup.project_set_id == self.id)
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def get_submission_principal(self, user):
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"""Get the principal on behalf of which the user can submit.
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If this is a solo project set, the given user is returned. If
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the user is a member of exactly one group, all the group is
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returned. Otherwise, None is returned.
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groups = self.get_groups_for_user(user)
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if groups.count() == 1:
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return self.max_students_per_group is not None
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"""Get the entities (groups or users) assigned to submit this project.
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This will be a Storm ResultSet.
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#If its a solo project, return everyone in offering
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return self.project_groups
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return self.offering.students
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class DeadlinePassed(Exception):
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"""An exception indicating that a project cannot be submitted because the
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deadline has passed."""
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return "The project deadline has passed"
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class Project(Storm):
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"""A student project for which submissions can be made."""
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__storm_table__ = "project"
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id = Int(name="projectid", primary=True)
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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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# Raise SubmissionError if the path is illegal
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ps.path = ProjectSubmission.test_and_normalise_path(path)
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ps.revision = revision
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ps.date_submitted = datetime.datetime.now()
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def get_permissions(self, user, config):
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return self.project_set.offering.get_permissions(user, config)
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def latest_submissions(self):
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"""Return the latest submission for each Assessed."""
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return Store.of(self).find(ProjectSubmission,
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Assessed.project_id == self.id,
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ProjectSubmission.assessed_id == Assessed.id,
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ProjectSubmission.date_submitted == Select(
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Max(ProjectSubmission.date_submitted),
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ProjectSubmission.assessed_id == Assessed.id,
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tables=ProjectSubmission
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def has_deadline_passed(self, user):
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"""Check whether the deadline has passed."""
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# XXX: Need to respect extensions.
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return self.deadline < datetime.datetime.now()
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def get_submissions_for_principal(self, principal):
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"""Fetch a ResultSet of all submissions by a particular principal."""
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assessed = Assessed.get(Store.of(self), principal, self)
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return assessed.submissions
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class ProjectGroup(Storm):
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"""A group of students working together on a project."""
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__storm_table__ = "project_group"
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id = Int(name="groupid", primary=True)
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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, config):
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if user.admin or user in self.members:
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return set(['submit_project'])
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class ProjectGroupMembership(Storm):
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"""A student's membership in a project group."""
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__storm_table__ = "group_member"
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__storm_primary__ = "user_id", "project_group_id"
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return "<%s %r in %r>" % (type(self).__name__, self.user,
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self.project_group)
728
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
732
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')
751
return "<%s %r in %r>" % (type(self).__name__,
752
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."""
757
return self.project_group is not None
761
return self.project_group or self.user
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def checkout_location(self):
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"""Returns the location of the Subversion workspace for this piece of
766
assessment, relative to each group member's home directory."""
767
subjectname = self.project.project_set.offering.subject.short_name
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checkout_dir_name = self.principal.short_name
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checkout_dir_name = "mywork"
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return subjectname + "/" + checkout_dir_name
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def get(cls, store, principal, project):
776
"""Find or create an Assessed for the given user or group and project.
778
@param principal: The user or group.
779
@param project: The project.
782
if t not in (User, ProjectGroup):
783
raise AssertionError('principal must be User or ProjectGroup')
786
(t is User) or (cls.project_group_id == principal.id),
787
(t is ProjectGroup) or (cls.user_id == principal.id),
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cls.project_id == project.id).one()
795
a.project_group = principal
802
class ProjectExtension(Storm):
803
"""An extension granted to a user or group on a particular project.
805
The user or group and project are specified by the Assessed.
808
__storm_table__ = "project_extension"
810
id = Int(name="extensionid", primary=True)
811
assessed_id = Int(name="assessedid")
812
assessed = Reference(assessed_id, Assessed.id)
813
deadline = DateTime()
814
approver_id = Int(name="approver")
815
approver = Reference(approver_id, User.id)
818
class SubmissionError(Exception):
819
"""Denotes a validation error during submission."""
822
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
826
repository. The repository is that owned by the submission's user and
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group, while the path and revision are explicit.
829
The user or group and project are specified by the Assessed.
832
__storm_table__ = "project_submission"
834
id = Int(name="submissionid", primary=True)
835
assessed_id = Int(name="assessedid")
836
assessed = Reference(assessed_id, Assessed.id)
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submitter_id = Int(name="submitter")
840
submitter = Reference(submitter_id, User.id)
841
date_submitted = DateTime()
843
def get_verify_url(self, user):
844
"""Get the URL for verifying this submission, within the account of
846
# If this is a solo project, then self.path will be prefixed with the
847
# subject name. Remove the first path segment.
848
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
849
if not self.assessed.is_group:
850
if '/' in submitpath:
851
submitpath = submitpath.split('/', 1)[1]
854
return "/files/%s/%s/%s?r=%d" % (user.login,
855
self.assessed.checkout_location, submitpath, self.revision)
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def test_and_normalise_path(path):
859
"""Test that path is valid, and normalise it. This prevents possible
860
injections using malicious paths.
861
Returns the updated path, if successful.
862
Raises SubmissionError if invalid.
864
# Ensure the path is absolute to prevent being tacked onto working
866
# Prevent '\n' because it will break all sorts of things.
867
# Prevent '[' and ']' because they can be used to inject into the
869
# Normalise to avoid resulting in ".." path segments.
870
if not os.path.isabs(path):
871
raise SubmissionError("Path is not absolute")
872
if any(c in path for c in "\n[]"):
873
raise SubmissionError("Path must not contain '\\n', '[' or ']'")
874
return os.path.normpath(path)
396
876
# WORKSHEETS AND EXERCISES #
398
878
class Exercise(Storm):
879
"""An exercise for students to complete in a worksheet.
881
An exercise may be present in any number of worksheets.
399
884
__storm_table__ = "exercise"
400
885
id = Unicode(primary=True, name="identifier")
405
890
include = Unicode()
893
worksheet_exercises = ReferenceSet(id,
894
'WorksheetExercise.exercise_id')
408
896
worksheets = ReferenceSet(id,
409
897
'WorksheetExercise.exercise_id',
410
898
'WorksheetExercise.worksheet_id',
414
test_suites = ReferenceSet(id, 'TestSuite.exercise_id')
902
test_suites = ReferenceSet(id,
903
'TestSuite.exercise_id',
416
906
__init__ = _kwarg_init
418
908
def __repr__(self):
419
909
return "<%s %s>" % (type(self).__name__, self.name)
421
def get_permissions(self, user):
911
def get_permissions(self, user, config):
912
return self.global_permissions(user, config)
915
def global_permissions(user, config):
916
"""Gets the set of permissions this user has over *all* exercises.
917
This is used to determine who may view the exercises list, and create
423
921
if user is not None:
425
923
perms.add('edit')
426
924
perms.add('view')
925
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
928
elif (config['policy']['tutors_can_edit_worksheets']
929
and u'tutor' in set((e.role for e in user.active_enrolments))):
930
# Site-specific policy on the role of tutors
936
def get_description(self):
937
"""Return the description interpreted as reStructuredText."""
938
return rst(self.description)
941
"""Deletes the exercise, providing it has no associated worksheets."""
942
if (self.worksheet_exercises.count() > 0):
943
raise IntegrityError()
944
for suite in self.test_suites:
946
Store.of(self).remove(self)
429
948
class Worksheet(Storm):
949
"""A worksheet with exercises for students to complete.
951
Worksheets are owned by offerings.
430
954
__storm_table__ = "worksheet"
432
956
id = Int(primary=True, name="worksheetid")
456
981
def __repr__(self):
457
982
return "<%s %s>" % (type(self).__name__, self.name)
459
# XXX Refactor this - make it an instance method of Subject rather than a
460
# class method of Worksheet. Can't do that now because Subject isn't
461
# linked referentially to the Worksheet.
463
def get_by_name(cls, store, subjectname, worksheetname):
465
Get the Worksheet from the db associated with a given store, subject
466
name and worksheet name.
468
return store.find(cls, cls.subject == unicode(subjectname),
469
cls.name == unicode(worksheetname)).one()
984
def remove_all_exercises(self):
985
"""Remove all exercises from this worksheet.
471
def remove_all_exercises(self, store):
473
Remove all exercises from this worksheet.
474
987
This does not delete the exercises themselves. It just removes them
475
988
from the worksheet.
990
store = Store.of(self)
991
for ws_ex in self.all_worksheet_exercises:
992
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
993
raise IntegrityError()
477
994
store.find(WorksheetExercise,
478
995
WorksheetExercise.worksheet == self).remove()
480
def get_permissions(self, user):
481
return self.offering.get_permissions(user)
997
def get_permissions(self, user, config):
998
# Almost the same permissions as for the offering itself
999
perms = self.offering.get_permissions(user, config)
1000
# However, "edit" permission is derived from the "edit_worksheets"
1001
# permission of the offering
1002
if 'edit_worksheets' in perms:
1005
perms.discard('edit')
1009
"""Returns the xml of this worksheet, converts from rst if required."""
1010
if self.format == u'rst':
1011
ws_xml = rst(self.data)
1017
"""Deletes the worksheet, provided it has no attempts on any exercises.
1019
Returns True if delete succeeded, or False if this worksheet has
1020
attempts attached."""
1021
for ws_ex in self.all_worksheet_exercises:
1022
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
1023
raise IntegrityError()
1025
self.remove_all_exercises()
1026
Store.of(self).remove(self)
483
1028
class WorksheetExercise(Storm):
1029
"""A link between a worksheet and one of its exercises.
1031
These may be marked optional, in which case the exercise does not count
1032
for marking purposes. The sequence number is used to order the worksheet
484
1036
__storm_table__ = "worksheet_exercise"
486
1038
id = Int(primary=True, name="ws_ex_id")
488
1040
worksheet_id = Int(name="worksheetid")
529
1083
self.exercise.name, self.user.login, self.date.strftime("%c"))
531
1085
class ExerciseAttempt(ExerciseSave):
533
An ExerciseAttempt is a special case of an ExerciseSave. Like an
534
ExerciseSave, it constitutes exercise solution data that the user has
535
submitted to the server for storage.
536
In addition, it contains additional information about the submission.
537
complete - True if this submission was successful, rendering this exercise
538
complete for this user.
539
active - True if this submission is "active" (usually true). Submissions
540
may be de-activated by privileged users for special reasons, and then
541
they won't count (either as a penalty or success), but will still be
1086
"""An attempt at solving an exercise.
1088
This is a special case of ExerciseSave, used when the user submits a
1089
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1092
In addition, it contains information about the result of the submission:
1094
- complete - True if this submission was successful, rendering this
1095
exercise complete for this user in this worksheet.
1096
- active - True if this submission is "active" (usually true).
1097
Submissions may be de-activated by privileged users for
1098
special reasons, and then they won't count (either as a
1099
penalty or success), but will still be stored.
544
1102
__storm_table__ = "exercise_attempt"
545
1103
__storm_primary__ = "ws_ex_id", "user_id", "date"
565
1128
function = Unicode()
566
1129
stdin = Unicode()
567
1130
exercise = Reference(exercise_id, Exercise.id)
568
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
569
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid')
1131
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1132
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1135
"""Delete this suite, without asking questions."""
1136
for variable in self.variables:
1138
for test_case in self.test_cases:
1140
Store.of(self).remove(self)
571
1142
class TestCase(Storm):
572
"""A TestCase is a member of a TestSuite.
574
It contains the data necessary to check if an exercise is correct"""
1143
"""A container for actual tests (see TestCasePart), inside a test suite.
1145
It is the lowest level shown to students on their pass/fail status."""
575
1147
__storm_table__ = "test_case"
576
1148
__storm_primary__ = "testid", "suiteid"
580
1152
suite = Reference(suiteid, "TestSuite.suiteid")
581
1153
passmsg = Unicode()
582
1154
failmsg = Unicode()
583
test_default = Unicode()
1155
test_default = Unicode() # Currently unused - only used for file matching.
586
1158
parts = ReferenceSet(testid, "TestCasePart.testid")
588
1160
__init__ = _kwarg_init
1163
for part in self.parts:
1165
Store.of(self).remove(self)
590
1167
class TestSuiteVar(Storm):
591
"""A container for the arguments of a Test Suite"""
1168
"""A variable used by an exercise test suite.
1170
This may represent a function argument or a normal variable.
592
1173
__storm_table__ = "suite_variable"
593
1174
__storm_primary__ = "varid"
597
1178
var_name = Unicode()
598
1179
var_value = Unicode()
599
1180
var_type = Unicode()
602
1183
suite = Reference(suiteid, "TestSuite.suiteid")
604
1185
__init__ = _kwarg_init
1188
Store.of(self).remove(self)
606
1190
class TestCasePart(Storm):
607
"""A container for the test elements of a Test Case"""
1191
"""An actual piece of code to test an exercise solution."""
608
1193
__storm_table__ = "test_case_part"
609
1194
__storm_primary__ = "partid"
614
1199
part_type = Unicode()
615
1200
test_type = Unicode()
616
1201
data = Unicode()
617
1202
filename = Unicode()
619
1204
test = Reference(testid, "TestCase.testid")
621
1206
__init__ = _kwarg_init
1209
Store.of(self).remove(self)
added
removed
ivle/database.py
