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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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# 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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'''Return Projects that the user can submit.
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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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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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@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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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.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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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', 'submit_project'])
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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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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):
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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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if user is not None:
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perms.add('view')
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def active_offerings(self):
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"""Return a sequence of currently active offerings for this subject
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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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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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"""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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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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"""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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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):
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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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perms.add('view')
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if (enrolment and enrolment.role in (u'tutor', u'lecturer')) \
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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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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):
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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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self.deadline > datetime.datetime.now())
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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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'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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@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):
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raise Exception('cannot submit')
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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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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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return '%s (%s)' % (self.nick, self.name)
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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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'''Return Projects that the group can submit.
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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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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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@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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(not active_only) or (Semester.state == u'current'))
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def get_permissions(self, user):
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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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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
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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(id, 'ProjectSubmission.assessed_id')
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submissions = ReferenceSet(
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id, 'ProjectSubmission.assessed_id', order_by='date_submitted')
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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)
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"""True if the Assessed is a group, False if it is a user."""
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return self.project_group is not None
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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
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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"
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return subjectname + "/" + checkout_dir_name
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def get(cls, store, principal, project):
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"""Find or create an Assessed for the given user or group and project.
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@param principal: The user or group.
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@param project: The project.
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t = type(principal)
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if t not in (User, ProjectGroup):
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raise AssertionError('principal must be User or ProjectGroup')
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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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Project.id == project.id).one()
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cls.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()
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class ProjectSubmission(Storm):
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"""A submission from a user or group repository to a particular project.
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The content of a submission is a single path and revision inside a
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repository. The repository is that owned by the submission's user and
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group, while the path and revision are explicit.
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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):
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"""Get the URL for verifying this submission, within the account of
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# If this is a solo project, then self.path will be prefixed with the
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# subject name. Remove the first path segment.
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submitpath = self.path[1:] if self.path[:1] == '/' else self.path
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if not self.assessed.is_group:
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if '/' in submitpath:
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submitpath = submitpath.split('/', 1)[1]
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return "/files/%s/%s/%s?r=%d" % (user.login,
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self.assessed.checkout_location, submitpath, self.revision)
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851
# WORKSHEETS AND EXERCISES #
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class Exercise(Storm):
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"""An exercise for students to complete in a worksheet.
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An exercise may be present in any number of worksheets.
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__storm_table__ = "exercise"
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id = Unicode(primary=True, name="identifier")
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def __repr__(self):
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return "<%s %s>" % (type(self).__name__, self.name)
622
def get_permissions(self, user):
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def get_permissions(self, user, config):
887
return self.global_permissions(user, config)
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def global_permissions(user, config):
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"""Gets the set of permissions this user has over *all* exercises.
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This is used to determine who may view the exercises list, and create
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if user is not None:
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perms.add('edit')
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perms.add('view')
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elif 'lecturer' in set((e.role for e in user.active_enrolments)):
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elif u'lecturer' in set((e.role for e in user.active_enrolments)):
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elif (config['policy']['tutors_can_edit_worksheets']
904
and u'tutor' in set((e.role for e in user.active_enrolments))):
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# Site-specific policy on the role of tutors
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def get_description(self):
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"""Return the description interpreted as reStructuredText."""
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return rst(self.description)
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def delete(self):
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921
Store.of(self).remove(self)
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923
class Worksheet(Storm):
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"""A worksheet with exercises for students to complete.
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Worksheets are owned by offerings.
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__storm_table__ = "worksheet"
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id = Int(primary=True, name="worksheetid")
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return "<%s %s>" % (type(self).__name__, self.name)
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def remove_all_exercises(self):
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Remove all exercises from this worksheet.
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"""Remove all exercises from this worksheet.
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This does not delete the exercises themselves. It just removes them
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from the worksheet.
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raise IntegrityError()
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store.find(WorksheetExercise,
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WorksheetExercise.worksheet == self).remove()
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def get_permissions(self, user):
691
return self.offering.get_permissions(user)
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def get_permissions(self, user, config):
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# 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"
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# permission of the offering
977
if 'edit_worksheets' in perms:
980
perms.discard('edit')
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def get_xml(self):
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"""Returns the xml of this worksheet, converts from rst if required."""
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if self.format == u'rst':
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def delete(self):
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"""Deletes the worksheet, provided it has no attempts on any exercises.
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Returns True if delete succeeded, or False if this worksheet has
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attempts attached."""
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for ws_ex in self.all_worksheet_exercises:
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if ws_ex.saves.count() > 0 or ws_ex.attempts.count() > 0:
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raise IntegrityError()
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self.remove_all_exercises()
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Store.of(self).remove(self)
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class WorksheetExercise(Storm):
1004
"""A link between a worksheet and one of its exercises.
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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
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1011
__storm_table__ = "worksheet_exercise"
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1013
id = Int(primary=True, name="ws_ex_id")
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1015
worksheet_id = Int(name="worksheetid")
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1029
return "<%s %s in %s>" % (type(self).__name__, self.exercise.name,
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1030
self.worksheet.identifier)
735
def get_permissions(self, user):
736
return self.worksheet.get_permissions(user)
1032
def get_permissions(self, user, config):
1033
return self.worksheet.get_permissions(user, config)
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1036
class ExerciseSave(Storm):
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
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.
748
1043
__storm_table__ = "exercise_save"
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__storm_primary__ = "ws_ex_id", "user_id"
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1058
self.exercise.name, self.user.login, self.date.strftime("%c"))
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1060
class ExerciseAttempt(ExerciseSave):
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
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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
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.
778
1077
__storm_table__ = "exercise_attempt"
779
1078
__storm_primary__ = "ws_ex_id", "user_id", "date"
783
1082
text = Unicode(name="attempt")
784
1083
complete = Bool()
787
def get_permissions(self, user):
1086
def get_permissions(self, user, config):
788
1087
return set(['view']) if user is self.user else set()
790
1089
class TestSuite(Storm):
791
"""A Testsuite acts as a container for the test cases of an exercise."""
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.
792
1096
__storm_table__ = "test_suite"
793
1097
__storm_primary__ = "exercise_id", "suiteid"
796
1100
exercise_id = Unicode(name="exerciseid")
797
1101
description = Unicode()
801
1105
exercise = Reference(exercise_id, Exercise.id)
802
1106
test_cases = ReferenceSet(suiteid, 'TestCase.suiteid', order_by="seq_no")
803
1107
variables = ReferenceSet(suiteid, 'TestSuiteVar.suiteid', order_by='arg_no')
805
1109
def delete(self):
806
1110
"""Delete this suite, without asking questions."""
807
for vaariable in self.variables:
1111
for variable in self.variables:
808
1112
variable.delete()
809
1113
for test_case in self.test_cases:
810
1114
test_case.delete()
811
1115
Store.of(self).remove(self)
813
1117
class TestCase(Storm):
814
"""A TestCase is a member of a TestSuite.
816
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."""
817
1122
__storm_table__ = "test_case"
818
1123
__storm_primary__ = "testid", "suiteid"
822
1127
suite = Reference(suiteid, "TestSuite.suiteid")
823
1128
passmsg = Unicode()
824
1129
failmsg = Unicode()
825
test_default = Unicode()
1130
test_default = Unicode() # Currently unused - only used for file matching.
828
1133
parts = ReferenceSet(testid, "TestCasePart.testid")
830
1135
__init__ = _kwarg_init
832
1137
def delete(self):
833
1138
for part in self.parts:
835
1140
Store.of(self).remove(self)
837
1142
class TestSuiteVar(Storm):
838
"""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.
839
1148
__storm_table__ = "suite_variable"
840
1149
__storm_primary__ = "varid"
844
1153
var_name = Unicode()
845
1154
var_value = Unicode()
846
1155
var_type = Unicode()
849
1158
suite = Reference(suiteid, "TestSuite.suiteid")
851
1160
__init__ = _kwarg_init
853
1162
def delete(self):
854
1163
Store.of(self).remove(self)
856
1165
class TestCasePart(Storm):
857
"""A container for the test elements of a Test Case"""
1166
"""An actual piece of code to test an exercise solution."""
858
1168
__storm_table__ = "test_case_part"
859
1169
__storm_primary__ = "partid"
864
1174
part_type = Unicode()
865
1175
test_type = Unicode()
866
1176
data = Unicode()
867
1177
filename = Unicode()
869
1179
test = Reference(testid, "TestCase.testid")
871
1181
__init__ = _kwarg_init
873
1183
def delete(self):
874
1184
Store.of(self).remove(self)
added
removed
ivle/database.py
