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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.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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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
677
@param active_only: Whether to only search active offerings.
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@param offering: An optional offering to restrict the search to.
680
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):
691
if user.admin or user in self.members:
692
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
717
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')
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return "<%s %r in %r>" % (type(self).__name__,
737
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."""
742
return self.project_group is not None
746
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
751
assessment, relative to each group member's home directory."""
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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"
757
return subjectname + "/" + checkout_dir_name
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def get(cls, store, principal, project):
761
"""Find or create an Assessed for the given user or group and project.
763
@param principal: The user or group.
764
@param project: The project.
767
if t not in (User, ProjectGroup):
768
raise AssertionError('principal must be User or ProjectGroup')
771
(t is User) or (cls.project_group_id == principal.id),
772
(t is ProjectGroup) or (cls.user_id == principal.id),
773
cls.project_id == project.id).one()
780
a.project_group = principal
787
class ProjectExtension(Storm):
788
"""An extension granted to a user or group on a particular project.
790
The user or group and project are specified by the Assessed.
793
__storm_table__ = "project_extension"
795
id = Int(name="extensionid", primary=True)
796
assessed_id = Int(name="assessedid")
797
assessed = Reference(assessed_id, Assessed.id)
798
deadline = DateTime()
799
approver_id = Int(name="approver")
800
approver = Reference(approver_id, User.id)
803
class ProjectSubmission(Storm):
804
"""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
807
repository. The repository is that owned by the submission's user and
808
group, while the path and revision are explicit.
810
The user or group and project are specified by the Assessed.
813
__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)
820
submitter_id = Int(name="submitter")
821
submitter = Reference(submitter_id, User.id)
822
date_submitted = DateTime()
824
def get_verify_url(self, user):
825
"""Get the URL for verifying this submission, within the account of
827
# If this is a solo project, then self.path will be prefixed with the
828
# subject name. Remove the first path segment.
829
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
830
if not self.assessed.is_group:
831
if '/' in submitpath:
832
submitpath = submitpath.split('/', 1)[1]
835
return "/files/%s/%s/%s?r=%d" % (user.login,
836
self.assessed.checkout_location, submitpath, self.revision)
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393
# WORKSHEETS AND EXERCISES #
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class Exercise(Storm):
841
"""An exercise for students to complete in a worksheet.
843
An exercise may be present in any number of worksheets.
846
396
__storm_table__ = "exercise"
847
397
id = Unicode(primary=True, name="identifier")
870
417
def __repr__(self):
871
418
return "<%s %s>" % (type(self).__name__, self.name)
873
def get_permissions(self, user, config):
874
return self.global_permissions(user, config)
877
def global_permissions(user, config):
878
"""Gets the set of permissions this user has over *all* exercises.
879
This is used to determine who may view the exercises list, and create
420
def get_permissions(self, user):
883
422
if user is not None:
885
424
perms.add('edit')
886
425
perms.add('view')
887
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
890
elif (config['policy']['tutors_can_edit_worksheets']
891
and u'tutor' in set((e.role for e in user.active_enrolments))):
892
# Site-specific policy on the role of tutors
898
def get_description(self):
899
"""Return the description interpreted as reStructuredText."""
900
return rst(self.description)
903
"""Deletes the exercise, providing it has no associated worksheets."""
904
if (self.worksheet_exercises.count() > 0):
905
raise IntegrityError()
906
for suite in self.test_suites:
908
Store.of(self).remove(self)
910
428
class Worksheet(Storm):
911
"""A worksheet with exercises for students to complete.
913
Worksheets are owned by offerings.
916
429
__storm_table__ = "worksheet"
918
431
id = Int(primary=True, name="worksheetid")
943
456
def __repr__(self):
944
457
return "<%s %s>" % (type(self).__name__, self.name)
946
def remove_all_exercises(self):
947
"""Remove all exercises from this worksheet.
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()
471
def remove_all_exercises(self, store):
473
Remove all exercises from this worksheet.
949
474
This does not delete the exercises themselves. It just removes them
950
475
from the worksheet.
952
store = Store.of(self)
953
for ws_ex in self.all_worksheet_exercises:
954
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
955
raise IntegrityError()
956
477
store.find(WorksheetExercise,
957
478
WorksheetExercise.worksheet == self).remove()
959
def get_permissions(self, user, config):
960
# Almost the same permissions as for the offering itself
961
perms = self.offering.get_permissions(user, config)
962
# However, "edit" permission is derived from the "edit_worksheets"
963
# permission of the offering
964
if 'edit_worksheets' in perms:
967
perms.discard('edit')
480
def get_permissions(self, user):
481
return self.offering.get_permissions(user)
970
483
def get_xml(self):
971
484
"""Returns the xml of this worksheet, converts from rst if required."""
972
485
if self.format == u'rst':
973
ws_xml = rst(self.data)
486
ws_xml = '<worksheet>' + rst(self.data) + '</worksheet>'
979
"""Deletes the worksheet, provided it has no attempts on any exercises.
981
Returns True if delete succeeded, or False if this worksheet has
982
attempts attached."""
983
for ws_ex in self.all_worksheet_exercises:
984
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
985
raise IntegrityError()
987
self.remove_all_exercises()
988
Store.of(self).remove(self)
990
491
class WorksheetExercise(Storm):
991
"""A link between a worksheet and one of its exercises.
993
These may be marked optional, in which case the exercise does not count
994
for marking purposes. The sequence number is used to order the worksheet
998
492
__storm_table__ = "worksheet_exercise"
1000
494
id = Int(primary=True, name="ws_ex_id")
1002
496
worksheet_id = Int(name="worksheetid")
1016
510
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
1017
511
self.worksheet.identifier)
1019
def get_permissions(self, user, config):
1020
return self.worksheet.get_permissions(user, config)
1023
513
class ExerciseSave(Storm):
1024
"""A potential exercise solution submitted by a user for storage.
1026
This is not an actual tested attempt at an exercise, it's just a save of
1027
the editing session.
515
Represents a potential solution to an exercise that a user has submitted
516
to the server for storage.
517
A basic ExerciseSave is just the current saved text for this exercise for
518
this user (doesn't count towards their attempts).
519
ExerciseSave may be extended with additional semantics (such as
1030
522
__storm_table__ = "exercise_save"
1031
523
__storm_primary__ = "ws_ex_id", "user_id"
1045
537
self.exercise.name, self.user.login, self.date.strftime("%c"))
1047
539
class ExerciseAttempt(ExerciseSave):
1048
"""An attempt at solving an exercise.
1050
This is a special case of ExerciseSave, used when the user submits a
1051
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1054
In addition, it contains information about the result of the submission:
1056
- complete - True if this submission was successful, rendering this
1057
exercise complete for this user in this worksheet.
1058
- active - True if this submission is "active" (usually true).
1059
Submissions may be de-activated by privileged users for
1060
special reasons, and then they won't count (either as a
1061
penalty or success), but will still be stored.
541
An ExerciseAttempt is a special case of an ExerciseSave. Like an
542
ExerciseSave, it constitutes exercise solution data that the user has
543
submitted to the server for storage.
544
In addition, it contains additional information about the submission.
545
complete - True if this submission was successful, rendering this exercise
546
complete for this user.
547
active - True if this submission is "active" (usually true). Submissions
548
may be de-activated by privileged users for special reasons, and then
549
they won't count (either as a penalty or success), but will still be
1064
552
__storm_table__ = "exercise_attempt"
1065
553
__storm_primary__ = "ws_ex_id", "user_id", "date"
1093
576
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1094
577
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1097
"""Delete this suite, without asking questions."""
1098
for variable in self.variables:
1100
for test_case in self.test_cases:
1102
Store.of(self).remove(self)
1104
579
class TestCase(Storm):
1105
"""A container for actual tests (see TestCasePart), inside a test suite.
1107
It is the lowest level shown to students on their pass/fail status."""
580
"""A TestCase is a member of a TestSuite.
582
It contains the data necessary to check if an exercise is correct"""
1109
583
__storm_table__ = "test_case"
1110
584
__storm_primary__ = "testid", "suiteid"
1114
588
suite = Reference(suiteid, "TestSuite.suiteid")
1115
589
passmsg = Unicode()
1116
590
failmsg = Unicode()
1117
test_default = Unicode() # Currently unused - only used for file matching.
591
test_default = Unicode()
1120
594
parts = ReferenceSet(testid, "TestCasePart.testid")
1122
596
__init__ = _kwarg_init
1125
for part in self.parts:
1127
Store.of(self).remove(self)
1129
598
class TestSuiteVar(Storm):
1130
"""A variable used by an exercise test suite.
1132
This may represent a function argument or a normal variable.
599
"""A container for the arguments of a Test Suite"""
1135
600
__storm_table__ = "suite_variable"
1136
601
__storm_primary__ = "varid"
1140
605
var_name = Unicode()
1141
606
var_value = Unicode()
1142
607
var_type = Unicode()
1145
610
suite = Reference(suiteid, "TestSuite.suiteid")
1147
612
__init__ = _kwarg_init
1150
Store.of(self).remove(self)
1152
614
class TestCasePart(Storm):
1153
"""An actual piece of code to test an exercise solution."""
615
"""A container for the test elements of a Test Case"""
1155
616
__storm_table__ = "test_case_part"
1156
617
__storm_primary__ = "partid"
1161
622
part_type = Unicode()
1162
623
test_type = Unicode()
1163
624
data = Unicode()
1164
625
filename = Unicode()
1166
627
test = Reference(testid, "TestCase.testid")
1168
629
__init__ = _kwarg_init
1171
Store.of(self).remove(self)
added
removed
ivle/database.py
