Exception Value: (1048, "Column 'active_year_id' cannot be null")
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Kumar Shwetabh on Twitter: "#DjangoTip #Django If you plan to override form_valid() method in your view file, make sure to call https://t.co/UYz9MYpisI_m2m() also in order to save many2many model relations also. The
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django FormView] return super().form_valid(form) 하는 이유
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How can I edit form instance before it will be save using Class-Based-Views? - Using Django - Django Forum
