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Viewing changes to ivle/database.py

https://launchpad.net/bugs/526956
https://launchpad.net/bugs/526960
Allow hiding of worksheets from students, and hiding of worksheet marks out of 5. Also add column for per-offering worksheet cutoff date, as yet unimplemented.

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ivle/database.py
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    semester = Reference(semester_id, Semester.id)
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    description = Unicode()
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    url = Unicode()
 
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    show_worksheet_marks = Bool()
 
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    worksheet_cutoff = DateTime()
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    groups_student_permissions = Unicode()
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    enrolments = ReferenceSet(id, 'Enrolment.offering_id')
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            newws.identifier = worksheet.identifier
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            newws.name = worksheet.name
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            newws.assessable = worksheet.assessable
 
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            newws.published = worksheet.published
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            newws.data = worksheet.data
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            newws.format = worksheet.format
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            newws.offering = self
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    identifier = Unicode()
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    name = Unicode()
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    assessable = Bool()
 
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    published = Bool()
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    data = Unicode()
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    seq_no = Int()
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    format = Unicode()
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            WorksheetExercise.worksheet == self).remove()
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    def get_permissions(self, user, config):
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        # Almost the same permissions as for the offering itself
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        perms = self.offering.get_permissions(user, config)
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        # However, "edit" permission is derived from the "edit_worksheets"
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        # permission of the offering
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        if 'edit_worksheets' in perms:
 
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        offering_perms = self.offering.get_permissions(user, config)
 
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        perms = set()
 
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        # Anybody who can view an offering can view a published
 
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        # worksheet.
 
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        if 'view' in offering_perms and self.published:
 
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            perms.add('view')
 
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        # Any worksheet editors can both view and edit.
 
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        if 'edit_worksheets' in offering_perms:
 
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            perms.add('view')
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            perms.add('edit')
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        else:
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            perms.discard('edit')
 
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        return perms
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    def get_xml(self):