[Rails] assign values to attributes.

In my model I did self.durc_expiry_date = self.durc_issue_date +
90.days but I think it is not a best practice to update attributes
from model.
So I remove that code and put
def create
@supplier = Supplier.new(params[:supplier])
@supplier.durc_expiry_date = @supplier.durc_issue_date + 90.days
.......

in the controller.
But doing so I have no values in durc.expiry.date.

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