IMHO, your first attempt, update attributes in model, is the best
practice because model is where you keep attention of your data.
Anyway, to save your data in the controller:
def create
@supplier = Supplier.new(params[:supplier])
@supplier.durc_expiry_date = @supplier.durc_issue_date + 90.days
@suplier.save
.....
Or maybe, if you want rescue errors:
def create
@supplier = Supplier.new(params[:supplier])
@supplier.durc_expiry_date = @supplier.durc_issue_date + 90.days
if @suplier.save
do stuff
else
do other stuff
end
.....
Regards,
Giorgio
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