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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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# TODO: Invitations should be listed too?
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def get_groups(self, offering=None):
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"""Get groups of which this user is a member.
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@param offering: An optional offering to restrict the search to.
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ProjectGroupMembership.user_id == self.id,
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ProjectGroup.id == ProjectGroupMembership.project_group_id,
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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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'''Return 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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Unless active_only is False, only projects for active offerings will
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If an offering is specified, returned projects will be limited to
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those for that offering.
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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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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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Enrolment.user_id == self.id)
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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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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', '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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def __repr__(self):
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return "<%s '%s'>" % (type(self).__name__, self.short_name)
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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 an admin, they may edit.
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Otherwise they may only read.
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def get_permissions(self, user):
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if user is not None:
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perms.add('view')
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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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"""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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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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"""Get the offering for the given year/semester, or None."""
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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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return "<%s %s/%s>" % (type(self).__name__, self.year, self.semester)
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class Offering(Storm):
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"""An offering of a subject in a particular semester."""
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__storm_table__ = "offering"
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id = Int(primary=True, name="offeringid")
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subject = Reference(subject_id, Subject.id)
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semester_id = Int(name="semesterid")
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semester = Reference(semester_id, Semester.id)
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description = Unicode()
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groups_student_permissions = Unicode()
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enrolments = ReferenceSet(id, 'Enrolment.offering_id')
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'Enrolment.user_id',
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project_sets = ReferenceSet(id, 'ProjectSet.offering_id')
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projects = ReferenceSet(id,
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'ProjectSet.offering_id',
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'Project.project_set_id')
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worksheets = ReferenceSet(id,
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'Worksheet.offering_id',
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def enrol(self, user, role=u'student'):
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"""Enrol a user in this offering.
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Enrolments handle both the staff and student cases. The role controls
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the privileges granted by this enrolment.
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'''Enrol a user in 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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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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perms.add('view')
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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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if (enrolment and enrolment.role in (u'tutor', u'lecturer')) \
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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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except NotOneError:
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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 %r in %r>" % (type(self).__name__, self.user,
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def get_permissions(self, user, config):
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# A user can edit any enrolment that they could have created.
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if ('enrol_' + str(self.role)) in self.offering.get_permissions(
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"""Delete this enrolment."""
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Store.of(self).remove(self)
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class ProjectSet(Storm):
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"""A set of projects that share common groups.
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Each student project group is attached to a project set. The group is
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valid for all projects in the group's set.
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__storm_table__ = "project_set"
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id = Int(name="projectsetid", primary=True)
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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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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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def can_submit(self, principal):
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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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self.deadline > datetime.datetime.now())
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def submit(self, principal, path, revision, who):
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"""Submit a Subversion path and revision to a project.
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@param principal: The owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made
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@param path: A path within that repository to submit.
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@param revision: The revision of that path to submit.
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@param who: The user who is actually making the submission.
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'principal' is the owner of the Subversion repository, and the
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entity on behalf of whom the submission is being made. 'path' is
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a path within that repository, and 'revision' specifies which
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revision of that path. 'who' is the person making the submission.
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if not self.can_submit(principal, who):
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raise DeadlinePassed()
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if not self.can_submit(principal):
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raise Exception('cannot submit')
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a = Assessed.get(Store.of(self), principal, self)
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ps = ProjectSubmission()
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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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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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return '%s (%s)' % (self.nick, self.name)
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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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'''Return 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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Unless active_only is False, projects will only be returned if the
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group's offering is active.
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If an offering is specified, projects will only be returned if it
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return Store.of(self).find(Project,
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Project.project_set_id == ProjectSet.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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def get_permissions(self, user):
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if user.admin or user in self.members:
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return set(['submit_project'])
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class ProjectGroupMembership(Storm):
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"""A student's membership in a project group."""
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__storm_table__ = "group_member"
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__storm_primary__ = "user_id", "project_group_id"
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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.
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__storm_table__ = "assessed"
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id = Int(name="assessedid", primary=True)
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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(
746
id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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submissions = ReferenceSet(id, 'ProjectSubmission.assessed_id')
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def __repr__(self):
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return "<%s %r in %r>" % (type(self).__name__,
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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
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def checkout_location(self):
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"""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.
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t = type(principal)
780
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if t not in (User, ProjectGroup):
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raise AssertionError('principal must be User or ProjectGroup')
783
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a = store.find(cls,
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(t is User) or (cls.project_group_id == principal.id),
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(t is ProjectGroup) or (cls.user_id == principal.id),
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cls.project_id == project.id).one()
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Project.id == project.id).one()
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class ProjectExtension(Storm):
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"""An extension granted to a user or group on a particular project.
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The user or group and project are specified by the Assessed.
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__storm_table__ = "project_extension"
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id = Int(name="extensionid", primary=True)
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notes = Unicode()
816
579
class ProjectSubmission(Storm):
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"""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.
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__storm_table__ = "project_submission"
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id = Int(name="submissionid", primary=True)
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submitter = Reference(submitter_id, User.id)
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date_submitted = DateTime()
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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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592
# WORKSHEETS AND EXERCISES #
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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.
859
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__storm_table__ = "exercise"
860
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id = Unicode(primary=True, name="identifier")
883
619
def __repr__(self):
884
620
return "<%s %s>" % (type(self).__name__, self.name)
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
622
def get_permissions(self, user):
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625
if user is not None:
898
627
perms.add('edit')
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628
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
629
elif 'lecturer' in set((e.role for e in user.active_enrolments)):
911
635
def get_description(self):
912
"""Return the description interpreted as reStructuredText."""
913
636
return rst(self.description)
915
638
def delete(self):
921
644
Store.of(self).remove(self)
923
646
class Worksheet(Storm):
924
"""A worksheet with exercises for students to complete.
926
Worksheets are owned by offerings.
929
647
__storm_table__ = "worksheet"
931
649
id = Int(primary=True, name="worksheetid")
957
675
return "<%s %s>" % (type(self).__name__, self.name)
959
677
def remove_all_exercises(self):
960
"""Remove all exercises from this worksheet.
679
Remove all exercises from this worksheet.
962
680
This does not delete the exercises themselves. It just removes them
963
681
from the worksheet.
968
686
raise IntegrityError()
969
687
store.find(WorksheetExercise,
970
688
WorksheetExercise.worksheet == self).remove()
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')
690
def get_permissions(self, user):
691
return self.offering.get_permissions(user)
983
693
def get_xml(self):
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694
"""Returns the xml of this worksheet, converts from rst if required."""
985
695
if self.format == u'rst':
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701
def delete(self):
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"""Deletes the worksheet, provided it has no attempts on any exercises.
994
704
Returns True if delete succeeded, or False if this worksheet has
995
705
attempts attached."""
996
706
for ws_ex in self.all_worksheet_exercises:
997
707
if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
998
708
raise IntegrityError()
1000
710
self.remove_all_exercises()
1001
711
Store.of(self).remove(self)
1003
713
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
1011
714
__storm_table__ = "worksheet_exercise"
1013
716
id = Int(primary=True, name="ws_ex_id")
1015
718
worksheet_id = Int(name="worksheetid")
1029
732
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
1030
733
self.worksheet.identifier)
1032
def get_permissions(self, user, config):
1033
return self.worksheet.get_permissions(user, config)
735
def get_permissions(self, user):
736
return self.worksheet.get_permissions(user)
1036
739
class ExerciseSave(Storm):
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.
741
Represents a potential solution to an exercise that a user has submitted
742
to the server for storage.
743
A basic ExerciseSave is just the current saved text for this exercise for
744
this user (doesn't count towards their attempts).
745
ExerciseSave may be extended with additional semantics (such as
1043
748
__storm_table__ = "exercise_save"
1044
749
__storm_primary__ = "ws_ex_id", "user_id"
1058
763
self.exercise.name, self.user.login, self.date.strftime("%c"))
1060
765
class ExerciseAttempt(ExerciseSave):
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.
767
An ExerciseAttempt is a special case of an ExerciseSave. Like an
768
ExerciseSave, it constitutes exercise solution data that the user has
769
submitted to the server for storage.
770
In addition, it contains additional information about the submission.
771
complete - True if this submission was successful, rendering this exercise
772
complete for this user.
773
active - True if this submission is "active" (usually true). Submissions
774
may be de-activated by privileged users for special reasons, and then
775
they won't count (either as a penalty or success), but will still be
1077
778
__storm_table__ = "exercise_attempt"
1078
779
__storm_primary__ = "ws_ex_id", "user_id", "date"
1082
783
text = Unicode(name="attempt")
1083
784
complete = Bool()
1086
def get_permissions(self, user, config):
787
def get_permissions(self, user):
1087
788
return set(['view']) if user is self.user else set()
1089
790
class TestSuite(Storm):
1090
"""A container to group an exercise's test cases.
1092
The test suite contains some information on how to test. The function to
1093
test, variables to set and stdin data are stored here.
791
"""A Testsuite acts as a container for the test cases of an exercise."""
1096
792
__storm_table__ = "test_suite"
1097
793
__storm_primary__ = "exercise_id", "suiteid"
1100
796
exercise_id = Unicode(name="exerciseid")
1101
797
description = Unicode()
1105
801
exercise = Reference(exercise_id, Exercise.id)
1106
802
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
1107
803
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
1109
805
def delete(self):
1110
806
"""Delete this suite, without asking questions."""
1111
for variable in self.variables:
807
for vaariable in self.variables:
1112
808
variable.delete()
1113
809
for test_case in self.test_cases:
1114
810
test_case.delete()
1115
811
Store.of(self).remove(self)
1117
813
class TestCase(Storm):
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."""
814
"""A TestCase is a member of a TestSuite.
816
It contains the data necessary to check if an exercise is correct"""
1122
817
__storm_table__ = "test_case"
1123
818
__storm_primary__ = "testid", "suiteid"
1127
822
suite = Reference(suiteid, "TestSuite.suiteid")
1128
823
passmsg = Unicode()
1129
824
failmsg = Unicode()
1130
test_default = Unicode() # Currently unused - only used for file matching.
825
test_default = Unicode()
1133
828
parts = ReferenceSet(testid, "TestCasePart.testid")
1135
830
__init__ = _kwarg_init
1137
832
def delete(self):
1138
833
for part in self.parts:
1140
835
Store.of(self).remove(self)
1142
837
class TestSuiteVar(Storm):
1143
"""A variable used by an exercise test suite.
1145
This may represent a function argument or a normal variable.
838
"""A container for the arguments of a Test Suite"""
1148
839
__storm_table__ = "suite_variable"
1149
840
__storm_primary__ = "varid"
1153
844
var_name = Unicode()
1154
845
var_value = Unicode()
1155
846
var_type = Unicode()
1158
849
suite = Reference(suiteid, "TestSuite.suiteid")
1160
851
__init__ = _kwarg_init
1162
853
def delete(self):
1163
854
Store.of(self).remove(self)
1165
856
class TestCasePart(Storm):
1166
"""An actual piece of code to test an exercise solution."""
857
"""A container for the test elements of a Test Case"""
1168
858
__storm_table__ = "test_case_part"
1169
859
__storm_primary__ = "partid"
1174
864
part_type = Unicode()
1175
865
test_type = Unicode()
1176
866
data = Unicode()
1177
867
filename = Unicode()
1179
869
test = Reference(testid, "TestCase.testid")
1181
871
__init__ = _kwarg_init
1183
873
def delete(self):
1184
874
Store.of(self).remove(self)
added
removed
ivle/database.py
