Import using FasterCSV / Rails 3.1 / Ruby 1.8.7 - ruby-on-rails

Question

I'm attempting to import a tab separated file using FasterCSV. I've tried various things and get varying errors. In it's current state i'm getting a "undefined method `tempfile'" error.
I've added the fastercsv code to my create action as bulk import is the only way data will be added to this model.
Here's my code. Can anyone help please? Any assistance would be really appreciated!!
My Model:
class AppleSale < ActiveRecord::Base
end
My Controller:
require 'fastercsv'
require 'tempfile'
class AppleSalesController < ApplicationController
def new
#apple_sale = AppleSale.new
respond_to do |format|
format.html # new.html.erb
format.json { render :json => #apple_sale }
end
end
def create
file = params[:tsv_file]
FasterCSV.new(file.tempfile, {:headers => true, :quote_char=>'"', :col_sep =>"\t"}) do |row_data|
new_record = AppleSale.first_or_new(
'provider' => row_data['provider'],
'provider_country' => row_data['provider_country'],
'vendor_identifier' => row_data['vendor_identifier'],
'upc' => row_data['upc'],
'isrc' => row_data['isrc'],
'artist_show' => row_data['artist_show'],
'title' => row_data['title'],
'label_studio_network' => row_data['label_studio_network'],
'product_type_identifier' => row_data['product_type_identifier'],
'units' => row_data['units'],
'royalty_price' => row_data['royalty_price'],
'download_date' => row_data['download_date'],
'order_id' => row_data['order_id'],
'postal_code' => row_data['postal_code'],
'customer_identifier' => row_data['customer_identifier'],
'report_date' => row_data['report_date'],
'sale_return' => row_data['sale_return'],
'customer_currency' => row_data['customer_currency'],
'country_code' => row_data['country_code'],
'royalty_currency' => row_data['royalty_currency'],
'preorder' => row_data['preorder'],
'isan' => row_data['isan'],
'customer_price' => row_data['customer_price'],
'apple_identifier' => row_data['apple_identifier'],
'cma' => row_data['cma'],
'asset_content_flavor' => row_data['asset_content_flavor'],
'vendor_order_code' => row_data['vendor_order_code'],
'grid' => row_data['grid'],
'promo_code' => row_data['promo_code'],
'parent_identifier' => row_data['parent_identifier'],
'apple_identifier' => row_data['apple_identifier']
)
new_record.save
end
end
end
My Form View:
<%= form_for(#apple_sale, :multipart => true) do |f| -%>
<%= f.file_field :tsv_file %>
<%= f.submit "Upload >>", :class => "submit" %>
<% end %>
My Gemfile contains:
gem 'fastercsv'
Thanks in advance!!
UPDATE FOR OTHERS THAT MIGHT NEED THIS, I CAN'T ANSWER MY OWN QUESTION YET:
It was all in the controller, have changed to the following. This seems to work perfectly.
def create
uploaded_io = params[:apple_sale][:tsv_file]
File.open(Rails.root.join('public', 'uploads', uploaded_io.original_filename), 'w') do |file|
file.write(uploaded_io.read)
end
FasterCSV.foreach(uploaded_io.original_filename, {:headers => true, :col_sep =>"\t"}) do |row_data|
new_record = AppleSale.new(
'provider' => row_data[0],
'provider_country' => row_data[1],
'vendor_identifier' => row_data[2],
'upc' => row_data[3],
'isrc' => row_data[4],
'artist_show' => row_data[5],
'title' => row_data[6],
'label_studio_network' => row_data[7],
'product_type_identifier' => row_data[8],
'units' => row_data[9],
'royalty_price' => row_data[10],
'download_date' => row_data[11],
'order_id' => row_data[12],
'postal_code' => row_data[13],
'customer_identifier' => row_data[14],
'report_date' => row_data[15],
'sale_return' => row_data[16],
'customer_currency' => row_data[17],
'country_code' => row_data[18],
'royalty_currency' => row_data[19],
'preorder' => row_data[20],
'isan' => row_data[21],
'customer_price' => row_data[22],
'apple_identifier' => row_data[23],
'cma' => row_data[24],
'asset_content_flavor' => row_data[25],
'vendor_order_code' => row_data[26],
'grid' => row_data[27],
'promo_code' => row_data[28],
'parent_identifier' => row_data[29]
)
new_record.save
end
respond_to do |format|
format.html { redirect_to apple_sales_path, :notice => "Successfully imported sales." }
end
end

Answer 1

1: I don't think FasterCSV accepts a block with new.
2: According to the Rails 3.1 docs - when you implement a file upload form:
http://guides.rubyonrails.org/form_helpers.html#uploading-files
...the resulting param is an IO object, which is not necessarily a plain file.
Looking at the FasterCSV source it looks like parse accepts an IO object + a block,
so I think something like this should do it:
FasterCSV.parse(file, ...) do |row_data|
...
end