def save(self, commit=True, assignment=None):
if assignment:
self.instance.assignment = assignment
super(TaskForm, self).save(commit)
if 'grade_system' in self.cleaned_data:
grade_system = self.cleaned_data['grade_system']
if self.instance.assignment:
MarkAPI.delete_mark_sets(self.instance.assignment)
MarkAPI.delete_mark_sets(self.instance)
# Creation of marks for task
MarkAPI.create_marks_for_task(self.instance, grade_system)
return self.instance
