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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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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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723
return "<%s %r in %r>" % (type(self).__name__, self.user,
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724
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
730
sole specifier of the repository and project.
733
__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')
749
return "<%s %r in %r>" % (type(self).__name__,
750
self.user or self.project_group, self.project)
754
"""True if the Assessed is a group, False if it is a user."""
755
return self.project_group is not None
759
return self.project_group or self.user
762
def checkout_location(self):
763
"""Returns the location of the Subversion workspace for this piece of
764
assessment, relative to each group member's home directory."""
765
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"
770
return subjectname + "/" + checkout_dir_name
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def get(cls, store, principal, project):
774
"""Find or create an Assessed for the given user or group and project.
776
@param principal: The user or group.
777
@param project: The project.
780
if t not in (User, ProjectGroup):
781
raise AssertionError('principal must be User or ProjectGroup')
784
(t is User) or (cls.project_group_id == principal.id),
785
(t is ProjectGroup) or (cls.user_id == principal.id),
786
cls.project_id == project.id).one()
793
a.project_group = principal
800
class ProjectExtension(Storm):
801
"""An extension granted to a user or group on a particular project.
803
The user or group and project are specified by the Assessed.
806
__storm_table__ = "project_extension"
808
id = Int(name="extensionid", primary=True)
809
assessed_id = Int(name="assessedid")
810
assessed = Reference(assessed_id, Assessed.id)
811
deadline = DateTime()
812
approver_id = Int(name="approver")
813
approver = Reference(approver_id, User.id)
816
class ProjectSubmission(Storm):
817
"""A submission from a user or group repository to a particular project.
819
The content of a submission is a single path and revision inside a
820
repository. The repository is that owned by the submission's user and
821
group, while the path and revision are explicit.
823
The user or group and project are specified by the Assessed.
826
__storm_table__ = "project_submission"
828
id = Int(name="submissionid", primary=True)
829
assessed_id = Int(name="assessedid")
830
assessed = Reference(assessed_id, Assessed.id)
833
submitter_id = Int(name="submitter")
834
submitter = Reference(submitter_id, User.id)
835
date_submitted = DateTime()
837
def get_verify_url(self, user):
838
"""Get the URL for verifying this submission, within the account of
840
# If this is a solo project, then self.path will be prefixed with the
841
# subject name. Remove the first path segment.
842
submitpath = self.path[1:] if self.path[:1] == '/' else self.path
843
if not self.assessed.is_group:
844
if '/' in submitpath:
845
submitpath = submitpath.split('/', 1)[1]
848
return "/files/%s/%s/%s?r=%d" % (user.login,
849
self.assessed.checkout_location, submitpath, self.revision)
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851
# WORKSHEETS AND EXERCISES #
394
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class Exercise(Storm):
854
"""An exercise for students to complete in a worksheet.
856
An exercise may be present in any number of worksheets.
395
859
__storm_table__ = "exercise"
396
860
id = Unicode(primary=True, name="identifier")
401
865
include = Unicode()
868
worksheet_exercises = ReferenceSet(id,
869
'WorksheetExercise.exercise_id')
404
871
worksheets = ReferenceSet(id,
405
872
'WorksheetExercise.exercise_id',
406
873
'WorksheetExercise.worksheet_id',
410
test_suites = ReferenceSet(id, 'TestSuite.exercise_id')
877
test_suites = ReferenceSet(id,
878
'TestSuite.exercise_id',
412
881
__init__ = _kwarg_init
414
883
def __repr__(self):
415
884
return "<%s %s>" % (type(self).__name__, self.name)
417
def get_permissions(self, user):
886
def get_permissions(self, user, config):
887
return self.global_permissions(user, config)
890
def global_permissions(user, config):
891
"""Gets the set of permissions this user has over *all* exercises.
892
This is used to determine who may view the exercises list, and create
419
896
if user is not None:
421
898
perms.add('edit')
422
899
perms.add('view')
900
elif u'lecturer' in set((e.role for e in user.active_enrolments)):
903
elif (config['policy']['tutors_can_edit_worksheets']
904
and u'tutor' in set((e.role for e in user.active_enrolments))):
905
# Site-specific policy on the role of tutors
911
def get_description(self):
912
"""Return the description interpreted as reStructuredText."""
913
return rst(self.description)
916
"""Deletes the exercise, providing it has no associated worksheets."""
917
if (self.worksheet_exercises.count() > 0):
918
raise IntegrityError()
919
for suite in self.test_suites:
921
Store.of(self).remove(self)
425
923
class Worksheet(Storm):
924
"""A worksheet with exercises for students to complete.
926
Worksheets are owned by offerings.
426
929
__storm_table__ = "worksheet"
428
931
id = Int(primary=True, name="worksheetid")
452
956
def __repr__(self):
453
957
return "<%s %s>" % (type(self).__name__, self.name)
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()
959
def remove_all_exercises(self):
960
"""Remove all exercises from this worksheet.
467
def remove_all_exercises(self, store):
469
Remove all exercises from this worksheet.
470
962
This does not delete the exercises themselves. It just removes them
471
963
from the worksheet.
965
store = Store.of(self)
966
for ws_ex in self.all_worksheet_exercises:
967
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
968
raise IntegrityError()
473
969
store.find(WorksheetExercise,
474
970
WorksheetExercise.worksheet == self).remove()
476
def get_permissions(self, user):
477
return self.offering.get_permissions(user)
972
def get_permissions(self, user, config):
973
# Almost the same permissions as for the offering itself
974
perms = self.offering.get_permissions(user, config)
975
# However, "edit" permission is derived from the "edit_worksheets"
976
# permission of the offering
977
if 'edit_worksheets' in perms:
980
perms.discard('edit')
984
"""Returns the xml of this worksheet, converts from rst if required."""
985
if self.format == u'rst':
986
ws_xml = rst(self.data)
992
"""Deletes the worksheet, provided it has no attempts on any exercises.
994
Returns True if delete succeeded, or False if this worksheet has
995
attempts attached."""
996
for ws_ex in self.all_worksheet_exercises:
997
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
998
raise IntegrityError()
1000
self.remove_all_exercises()
1001
Store.of(self).remove(self)
479
1003
class WorksheetExercise(Storm):
1004
"""A link between a worksheet and one of its exercises.
1006
These may be marked optional, in which case the exercise does not count
1007
for marking purposes. The sequence number is used to order the worksheet
480
1011
__storm_table__ = "worksheet_exercise"
482
1013
id = Int(primary=True, name="ws_ex_id")
484
1015
worksheet_id = Int(name="worksheetid")
498
1029
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
499
1030
self.worksheet.identifier)
1032
def get_permissions(self, user, config):
1033
return self.worksheet.get_permissions(user, config)
501
1036
class ExerciseSave(Storm):
503
Represents a potential solution to an exercise that a user has submitted
504
to the server for storage.
505
A basic ExerciseSave is just the current saved text for this exercise for
506
this user (doesn't count towards their attempts).
507
ExerciseSave may be extended with additional semantics (such as
1037
"""A potential exercise solution submitted by a user for storage.
1039
This is not an actual tested attempt at an exercise, it's just a save of
1040
the editing session.
510
1043
__storm_table__ = "exercise_save"
511
1044
__storm_primary__ = "ws_ex_id", "user_id"
525
1058
self.exercise.name, self.user.login, self.date.strftime("%c"))
527
1060
class ExerciseAttempt(ExerciseSave):
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
1061
"""An attempt at solving an exercise.
1063
This is a special case of ExerciseSave, used when the user submits a
1064
candidate solution. Like an ExerciseSave, it constitutes exercise solution
1067
In addition, it contains information about the result of the submission:
1069
- complete - True if this submission was successful, rendering this
1070
exercise complete for this user in this worksheet.
1071
- active - True if this submission is "active" (usually true).
1072
Submissions may be de-activated by privileged users for
1073
special reasons, and then they won't count (either as a
1074
penalty or success), but will still be stored.
540
1077
__storm_table__ = "exercise_attempt"
541
1078
__storm_primary__ = "ws_ex_id", "user_id", "date"
561
1103
function = Unicode()
562
1104
stdin = Unicode()
563
1105
exercise = Reference(exercise_id, Exercise.id)
564
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid')
565
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid')
1106
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1107
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1110
"""Delete this suite, without asking questions."""
1111
for variable in self.variables:
1113
for test_case in self.test_cases:
1115
Store.of(self).remove(self)
567
1117
class TestCase(Storm):
568
"""A TestCase is a member of a TestSuite.
570
It contains the data necessary to check if an exercise is correct"""
1118
"""A container for actual tests (see TestCasePart), inside a test suite.
1120
It is the lowest level shown to students on their pass/fail status."""
571
1122
__storm_table__ = "test_case"
572
1123
__storm_primary__ = "testid", "suiteid"
576
1127
suite = Reference(suiteid, "TestSuite.suiteid")
577
1128
passmsg = Unicode()
578
1129
failmsg = Unicode()
579
test_default = Unicode()
1130
test_default = Unicode() # Currently unused - only used for file matching.
582
1133
parts = ReferenceSet(testid, "TestCasePart.testid")
584
1135
__init__ = _kwarg_init
1138
for part in self.parts:
1140
Store.of(self).remove(self)
586
1142
class TestSuiteVar(Storm):
587
"""A container for the arguments of a Test Suite"""
1143
"""A variable used by an exercise test suite.
1145
This may represent a function argument or a normal variable.
588
1148
__storm_table__ = "suite_variable"
589
1149
__storm_primary__ = "varid"
593
1153
var_name = Unicode()
594
1154
var_value = Unicode()
595
1155
var_type = Unicode()
598
1158
suite = Reference(suiteid, "TestSuite.suiteid")
600
1160
__init__ = _kwarg_init
1163
Store.of(self).remove(self)
602
1165
class TestCasePart(Storm):
603
"""A container for the test elements of a Test Case"""
1166
"""An actual piece of code to test an exercise solution."""
604
1168
__storm_table__ = "test_case_part"
605
1169
__storm_primary__ = "partid"
610
1174
part_type = Unicode()
611
1175
test_type = Unicode()
612
1176
data = Unicode()
613
1177
filename = Unicode()
615
1179
test = Reference(testid, "TestCase.testid")
617
1181
__init__ = _kwarg_init
1184
Store.of(self).remove(self)
added
removed
ivle/database.py
