def save(self):
if hasattr(self, 'chart_id'):
chart = get_object_or_404(Chart, pk=self.chart_id)
else:
chart = Chart()
report = get_object_or_404(Report, pk=self.report_id)
chart.report = report
chart.name = self.data['title']
chart.options = dumps(self.data)
chart.save()
return chart
