ruby on rails - ROR import csv file: undefined method -

i adding import csv online ordering app previous question include ror import csv file no method error, adding csv import ror application. thank have helped in other questions.

the error:

nomethoderror (undefined method `build_from_csv' #<class:0x9ddd82c>):    app/controllers/imports_controller.rb:14:in `block in imports'    /usr/local/ruby/lib/ruby/1.9.1/csv.rb:1761:in `each'    /usr/local/ruby/lib/ruby/1.9.1/csv.rb:1370:in `parse'    app/controllers/imports_controller.rb:10:in `imports' 

the imports_controller:

require 'csv' class importscontroller < applicationcontroller      def imports logger.info "file loaded" infile = params[:dump][:infile].read  n, errors = 0, [] @archive = [] csv.parse(infile) |row|   n += 1   # skip: header i.e. first row or blank row   next if n == 1 or row.join.blank?   imports = order.build_from_csv(row)   if imports.valid?     imports.save     @archive << row   else     errors << row   end end logger.info errors flash[:success] = "the csv imported successfully"   respond_to |format|   format.html # index.html.erb   format.json { render :json => @archive }   end end  

originally had models/imports.rb moved models/order.rb since trying add csv date table:

 def self.build_from_csv(row)       #last_level = (row[5].downcase == "yes"      orders = orders.new(:imports => "#{row[0]}}",                             :cart_items => "#{row[1]}",                             :cart_items_quantity => "#{row[2]}",                             :cart_items_price => "#{row[3]}",                             :cart_items_description => "#{row[4]}",                             :cart_items_upc => "#{row[5]}",                             :cart_items_sku => "#{row[6]}")                            # :last_level=> last_level)            return imports  end 

for line error:

imports = order.build_from_csv(row) 

i have tried

imports = imports.build_from_csv(row) 

i used order since table cart items inserted no luck. tried:

imports = csv.build_from_csv(row) 

...

imports = infile.build_from_csv(row) 

and caused uninitialized constant. open suggestions other things try, again help!