def home(request, bd=None):
"""Home view."""
if bd is not None:
bd_object = get_object_or_404(BlockDiagram, id=bd)
bd_data = BlockDiagramSerializer(bd_object).data
bd_serial = JSONRenderer().render(bd_data)
else:
bd_serial = "None"
return render(request, 'home.html', {'bd': bd_serial})
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