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

Question

I am adding an import CSV to an online ordering app previous question include ROR import csv file no method error, Adding CSV Import to a ROR application. Thank you to those that have helped in the other questions.
the error:
NoMethodError (undefined method `build_from_csv' for #<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) do |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 do |format|
format.html # index.html.erb
format.json { render :json => #archive }
end
end
originally I had a models/imports.rb but I moved it to models/order.rb since I am trying to add the csv date to that 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 the line with the error:
imports = Order.build_from_csv(row)
I have tried
imports = Imports.build_from_csv(row)
I used Order since that is that table that the cart items get inserted into but no luck. I also tried:
imports = CSV.build_from_csv(row)
...
imports = Infile.build_from_csv(row)
and that caused an Uninitialized Constant. I am open to suggestions for other things to try, Thanks again for the help!