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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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% (self.__class__.__name__, k))
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setattr(self, k, v)
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def get_conn_string(config):
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"""Create a Storm connection string to the IVLE database
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@param config: The IVLE configuration.
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def get_conn_string():
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Returns the Storm connection string, generated from the conf file.
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if config['database']['username']:
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clusterstr += config['database']['username']
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if config['database']['password']:
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clusterstr += ':' + config['database']['password']
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clusterstr += ivle.conf.db_user
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if ivle.conf.db_password:
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clusterstr += ':' + ivle.conf.db_password
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host = config['database']['host'] or 'localhost'
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port = config['database']['port'] or 5432
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host = ivle.conf.db_host or 'localhost'
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port = ivle.conf.db_port or 5432
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clusterstr += '%s:%d' % (host, port)
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return "postgres://%s/%s" % (clusterstr, config['database']['name'])
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def get_store(config):
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"""Create a Storm store connected to the IVLE database.
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@param config: The IVLE configuration.
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return Store(create_database(get_conn_string(config)))
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return "postgres://%s/%s" % (clusterstr, ivle.conf.db_dbname)
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Open a database connection and transaction. Return a storm.store.Store
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instance connected to the configured IVLE database.
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return Store(create_database(get_conn_string()))
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"""An IVLE user account."""
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Represents an IVLE user.
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__storm_table__ = "login"
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id = Int(primary=True, name="loginid")
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'''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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"""Hash a password with MD5."""
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return hashlib.md5(password).hexdigest()
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return md5.md5(password).hexdigest()
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def get_by_login(cls, store, login):
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"""Find a user in a store by login name."""
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Get the User from the db associated with a given store and
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return store.find(cls, cls.login == unicode(login)).one()
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def get_permissions(self, user, config):
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"""Determine privileges held by a user over this object.
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If the user requesting privileges is this user or an admin,
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they may do everything. Otherwise they may do nothing.
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def get_permissions(self, user):
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if user and user.admin or user is self:
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return set(['view_public', 'view', 'edit', 'submit_project'])
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return set(['view', 'edit'])
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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 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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def get_permissions(self, user):
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if user is not None:
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enrolment = self.get_enrolment(user)
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if enrolment or user.admin:
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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.published = worksheet.published
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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.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, 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
695
@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:
710
return set(['submit_project'])
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class ProjectGroupMembership(Storm):
715
"""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)
731
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
735
sole specifier of the repository and project.
738
__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')
750
submissions = ReferenceSet(
751
id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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return "<%s %r in %r>" % (type(self).__name__,
755
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."""
760
return self.project_group is not None
764
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
769
assessment, relative to each group member's home directory."""
770
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):
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"""Find or create an Assessed for the given user or group and project.
781
@param principal: The user or group.
782
@param project: The project.
785
if t not in (User, ProjectGroup):
786
raise AssertionError('principal must be User or ProjectGroup')
789
(t is User) or (cls.project_group_id == principal.id),
790
(t is ProjectGroup) or (cls.user_id == principal.id),
791
cls.project_id == project.id).one()
798
a.project_group = principal
805
class ProjectExtension(Storm):
806
"""An extension granted to a user or group on a particular project.
808
The user or group and project are specified by the Assessed.
811
__storm_table__ = "project_extension"
813
id = Int(name="extensionid", primary=True)
814
assessed_id = Int(name="assessedid")
815
assessed = Reference(assessed_id, Assessed.id)
816
deadline = DateTime()
817
approver_id = Int(name="approver")
818
approver = Reference(approver_id, User.id)
821
class SubmissionError(Exception):
822
"""Denotes a validation error during submission."""
825
class ProjectSubmission(Storm):
826
"""A submission from a user or group repository to a particular project.
828
The content of a submission is a single path and revision inside a
829
repository. The repository is that owned by the submission's user and
830
group, while the path and revision are explicit.
832
The user or group and project are specified by the Assessed.
835
__storm_table__ = "project_submission"
837
id = Int(name="submissionid", primary=True)
838
assessed_id = Int(name="assessedid")
839
assessed = Reference(assessed_id, Assessed.id)
842
submitter_id = Int(name="submitter")
843
submitter = Reference(submitter_id, User.id)
844
date_submitted = DateTime()
846
def get_verify_url(self, user):
847
"""Get the URL for verifying this submission, within the account of
849
# If this is a solo project, then self.path will be prefixed with the
850
# subject name. Remove the first path segment.
851
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
852
if not self.assessed.is_group:
853
if '/' in submitpath:
854
submitpath = submitpath.split('/', 1)[1]
857
return "/files/%s/%s/%s?r=%d" % (user.login,
858
self.assessed.checkout_location, submitpath, self.revision)
861
def test_and_normalise_path(path):
862
"""Test that path is valid, and normalise it. This prevents possible
863
injections using malicious paths.
864
Returns the updated path, if successful.
865
Raises SubmissionError if invalid.
867
# Ensure the path is absolute to prevent being tacked onto working
869
# Prevent '\n' because it will break all sorts of things.
870
# Prevent '[' and ']' because they can be used to inject into the
872
# Normalise to avoid resulting in ".." path segments.
873
if not os.path.isabs(path):
874
raise SubmissionError("Path is not absolute")
875
if any(c in path for c in "\n[]"):
876
raise SubmissionError("Path must not contain '\\n', '[' or ']'")
877
return os.path.normpath(path)
879
392
# WORKSHEETS AND EXERCISES #
881
394
class Exercise(Storm):
882
"""An exercise for students to complete in a worksheet.
884
An exercise may be present in any number of worksheets.
887
395
__storm_table__ = "exercise"
888
396
id = Unicode(primary=True, name="identifier")
893
401
include = Unicode()
896
worksheet_exercises = ReferenceSet(id,
897
'WorksheetExercise.exercise_id')
899
404
worksheets = ReferenceSet(id,
900
405
'WorksheetExercise.exercise_id',
901
406
'WorksheetExercise.worksheet_id',
905
test_suites = ReferenceSet(id,
906
'TestSuite.exercise_id',
410
test_suites = ReferenceSet(id, 'TestSuite.exercise_id')
909
412
__init__ = _kwarg_init
911
414
def __repr__(self):
912
415
return "<%s %s>" % (type(self).__name__, self.name)
914
def get_permissions(self, user, config):
915
return self.global_permissions(user, config)
918
def global_permissions(user, config):
919
"""Gets the set of permissions this user has over *all* exercises.
920
This is used to determine who may view the exercises list, and create
417
def get_permissions(self, user):
924
419
if user is not None:
926
421
perms.add('edit')
927
422
perms.add('view')
928
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
931
elif (config['policy']['tutors_can_edit_worksheets']
932
and u'tutor' in set((e.role for e in user.active_enrolments))):
933
# Site-specific policy on the role of tutors
939
def get_description(self):
940
"""Return the description interpreted as reStructuredText."""
941
return rst(self.description)
944
"""Deletes the exercise, providing it has no associated worksheets."""
945
if (self.worksheet_exercises.count() > 0):
946
raise IntegrityError()
947
for suite in self.test_suites:
949
Store.of(self).remove(self)
951
425
class Worksheet(Storm):
952
"""A worksheet with exercises for students to complete.
954
Worksheets are owned by offerings.
957
426
__storm_table__ = "worksheet"
959
428
id = Int(primary=True, name="worksheetid")
985
452
def __repr__(self):
986
453
return "<%s %s>" % (type(self).__name__, self.name)
988
def remove_all_exercises(self):
989
"""Remove all exercises from this worksheet.
455
# XXX Refactor this - make it an instance method of Subject rather than a
456
# class method of Worksheet. Can't do that now because Subject isn't
457
# linked referentially to the Worksheet.
459
def get_by_name(cls, store, subjectname, worksheetname):
461
Get the Worksheet from the db associated with a given store, subject
462
name and worksheet name.
464
return store.find(cls, cls.subject == unicode(subjectname),
465
cls.name == unicode(worksheetname)).one()
467
def remove_all_exercises(self, store):
469
Remove all exercises from this worksheet.
991
470
This does not delete the exercises themselves. It just removes them
992
471
from the worksheet.
994
store = Store.of(self)
995
for ws_ex in self.all_worksheet_exercises:
996
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
997
raise IntegrityError()
998
473
store.find(WorksheetExercise,
999
474
WorksheetExercise.worksheet == self).remove()
1001
def get_permissions(self, user, config):
1002
# Almost the same permissions as for the offering itself
1003
perms = self.offering.get_permissions(user, config)
1004
# However, "edit" permission is derived from the "edit_worksheets"
1005
# permission of the offering
1006
if 'edit_worksheets' in perms:
1009
perms.discard('edit')
1013
"""Returns the xml of this worksheet, converts from rst if required."""
1014
if self.format == u'rst':
1015
ws_xml = rst(self.data)
1021
"""Deletes the worksheet, provided it has no attempts on any exercises.
1023
Returns True if delete succeeded, or False if this worksheet has
1024
attempts attached."""
1025
for ws_ex in self.all_worksheet_exercises:
1026
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
1027
raise IntegrityError()
1029
self.remove_all_exercises()
1030
Store.of(self).remove(self)
476
def get_permissions(self, user):
477
return self.offering.get_permissions(user)
1032
479
class WorksheetExercise(Storm):
1033
"""A link between a worksheet and one of its exercises.
1035
These may be marked optional, in which case the exercise does not count
1036
for marking purposes. The sequence number is used to order the worksheet
1040
480
__storm_table__ = "worksheet_exercise"
1042
482
id = Int(primary=True, name="ws_ex_id")
1044
484
worksheet_id = Int(name="worksheetid")
1087
525
self.exercise.name, self.user.login, self.date.strftime("%c"))
1089
527
class ExerciseAttempt(ExerciseSave):
1090
"""An attempt at solving an exercise.
1092
This is a special case of ExerciseSave, used when the user submits a
1093
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1096
In addition, it contains information about the result of the submission:
1098
- complete - True if this submission was successful, rendering this
1099
exercise complete for this user in this worksheet.
1100
- active - True if this submission is "active" (usually true).
1101
Submissions may be de-activated by privileged users for
1102
special reasons, and then they won't count (either as a
1103
penalty or success), but will still be stored.
529
An ExerciseAttempt is a special case of an ExerciseSave. Like an
530
ExerciseSave, it constitutes exercise solution data that the user has
531
submitted to the server for storage.
532
In addition, it contains additional information about the submission.
533
complete - True if this submission was successful, rendering this exercise
534
complete for this user.
535
active - True if this submission is "active" (usually true). Submissions
536
may be de-activated by privileged users for special reasons, and then
537
they won't count (either as a penalty or success), but will still be
1106
540
__storm_table__ = "exercise_attempt"
1107
541
__storm_primary__ = "ws_ex_id", "user_id", "date"
1132
561
function = Unicode()
1133
562
stdin = Unicode()
1134
563
exercise = Reference(exercise_id, Exercise.id)
1135
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1136
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1139
"""Delete this suite, without asking questions."""
1140
for variable in self.variables:
1142
for test_case in self.test_cases:
1144
Store.of(self).remove(self)
564
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
565
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid')
1146
567
class TestCase(Storm):
1147
"""A container for actual tests (see TestCasePart), inside a test suite.
1149
It is the lowest level shown to students on their pass/fail status."""
568
"""A TestCase is a member of a TestSuite.
570
It contains the data necessary to check if an exercise is correct"""
1151
571
__storm_table__ = "test_case"
1152
572
__storm_primary__ = "testid", "suiteid"
1156
576
suite = Reference(suiteid, "TestSuite.suiteid")
1157
577
passmsg = Unicode()
1158
578
failmsg = Unicode()
1159
test_default = Unicode() # Currently unused - only used for file matching.
579
test_default = Unicode()
1162
582
parts = ReferenceSet(testid, "TestCasePart.testid")
1164
584
__init__ = _kwarg_init
1167
for part in self.parts:
1169
Store.of(self).remove(self)
1171
586
class TestSuiteVar(Storm):
1172
"""A variable used by an exercise test suite.
1174
This may represent a function argument or a normal variable.
587
"""A container for the arguments of a Test Suite"""
1177
588
__storm_table__ = "suite_variable"
1178
589
__storm_primary__ = "varid"
1182
593
var_name = Unicode()
1183
594
var_value = Unicode()
1184
595
var_type = Unicode()
1187
598
suite = Reference(suiteid, "TestSuite.suiteid")
1189
600
__init__ = _kwarg_init
1192
Store.of(self).remove(self)
1194
602
class TestCasePart(Storm):
1195
"""An actual piece of code to test an exercise solution."""
603
"""A container for the test elements of a Test Case"""
1197
604
__storm_table__ = "test_case_part"
1198
605
__storm_primary__ = "partid"
1203
610
part_type = Unicode()
1204
611
test_type = Unicode()
1205
612
data = Unicode()
1206
613
filename = Unicode()
1208
615
test = Reference(testid, "TestCase.testid")
1210
617
__init__ = _kwarg_init
1213
Store.of(self).remove(self)
added
removed
ivle/database.py
