[Rails] Re: assign values to attributes.

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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