Change update_attributes to update

app/controllers/suppliers_controller.rb

@@ -64,7 +64,7 @@ class SuppliersController < ApplicationController
       # don't set password to blank on saving
       attrs = attrs.reject {|k,v| k == 'ftp_password' } if attrs[:ftp_password].blank?
 
-      if @supplier.update_attributes(attrs)
+      if @supplier.update(attrs)
         flash[:notice] = 'Supplier was successfully updated.'
         format.html { redirect_to supplier_url(@supplier) }
         format.xml  { head :ok }