mysql - rails saves wrong value to database -

i'm not sure changed code try put value 7777777777777 database puts old serial_number 2147483647 value stored in database (and when removed record 2147483647 serial nunmber) still inserts record 2147483647 instead of 7777777777777 in database:

def create     @cart = current_cart     quantity = nil     resource = nil     args = {}      args[:quantity] = is_number?(params[:quantity]) ? params[:quantity].to_i : 1     if params[:sellable_type] == "product"       @product = product.find(params[:sellable_id])       args[:resource] = @product     elsif params[:sellable_type] == "airtimeplan"       @airtime_plan = airtimeplan.find(params[:sellable_id])       if @cart.airtime_list_items.any?         flash[:notice] = {:too_many_plans => "can purchase 1 airtime plan @ time"}         render "airtime_plans/show" , return       end        if ['marinetrac','mototrac','fleettrac','autotrac'].include? params[:unit_type]         args[:unit_type] = params[:unit_type]             else         flash[:notice] = {:nonexistant_plan => "no such plan exists"}         render "airtime_plans/show" , return       end        args[:resource] = @airtime_plan     end      args[:serial_number] = params[:serial_number]      @line_item = @cart.add_sellable_item args      #save line item update quantity, save association carton     if @line_item.save         redirect_to cart_path(@cart), notice: 'line item created.'     else       if params[:sellable_type] == "product"         render "products/show"       else         flash[:notice] = @line_item.errors.messages         render "airtime_plans/show"       end     end   end 

cart model

def add_sellable_item(args={})#resource, _quantity, serial_number=nil     resource = args[:resource]     _quantity = args[:quantity]     serial_number = args[:serial_number] if args[:serial_number]     unit_type = args[:unit_type] if args[:unit_type]      current_item = self.line_items.where(sellable_type: resource.class.name, sellable_id: resource.id).first      if current_item && current_item.sellable.is_a?(product)       current_item.quantity += _quantity      else       new_item = self.line_items.reload.create!(sellable_id: resource.id, sellable_type: resource.class.name, serial_number: 7777777777777)       puts "what serial number #{new_item.serial_number}"        new_item.quantity = _quantity       new_item.unit_type = unit_type if unit_type       return new_item     end      current_item   end 

i tried using reload, tried forcing create! , tried explicitly setting serial_number, , still creates record serial_number of 2147483647. have validates_uniquness_of constraints on line item model.

check log out, makes sense:

started post "/line_items" 127.0.0.1 @ 2013-05-21 14:01:18 -0400 processing lineitemscontroller#create html   parameters: {"utf8"=>"✓", "authenticity_token"=>"ioxew7itmoysfrxho3cywyb2b7tlfhvr7jgwhwxqwxg=", "serial_number"=>"102099394", "unit_type"=>"marinetrac", "sellable_id"=>"118", "sellable_type"=>"airtimeplan", "commit"=>"add cart"}    (0.1ms)  begin   sql (0.4ms)  insert `line_items` (`cart_id`, `created_at`, `order_id`, `quantity`, `sellable_id`, `sellable_type`, `serial_number`, `unit_type`, `updated_at`) values (null, '2013-05-21 18:01:18', null, 1, null, null, 7777777777777, null, '2013-05-21 18:01:18') mysql2::error: duplicate entry '2147483647' key 'index_line_items_on_serial_number': insert `line_items` (`cart_id`, `created_at`, `order_id`, `quantity`, `sellable_id`, `sellable_type`, `serial_number`, `unit_type`, `updated_at`) values (null, '2013-05-21 18:01:18', null, 1, null, null, 7777777777777, null, '2013-05-21 18:01:18')    (0.5ms)  rollback completed 500 internal server error in 14ms  activerecord::recordnotunique (mysql2::error: duplicate entry '2147483647' key 'index_line_items_on_serial_number': insert `line_items` (`cart_id`, `created_at`, `order_id`, `quantity`, `sellable_id`, `sellable_type`, `serial_number`, `unit_type`, `updated_at`) values (null, '2013-05-21 18:01:18', null, 1, null, null, 7777777777777, null, '2013-05-21 18:01:18')):   app/controllers/line_items_controller.rb:8:in `create'