FasterCSV for importing users in rails -

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hi, trying use fastercsv import users csv file

i have 

<form action='/users/bulk_create' method='post'>    <%= file_field_tag "csv_file" %><br/>    <%= submit_tag("import") %> </form>

in users controller have method like

   def bulk_create          login, password, name, email = 0, 1, 2, 3      require 'fastercsv'           parsed_rows=fastercsv.parse(params[:csv_file])            parsed_rows.each |row|             puts "#{row[name]}"            end    end

when above , inspect in log getting error as

 nomethoderror (undefined method `pos' nil:nilclass):  app/controllers/users_controller.rb:688:in `bulk_create'

fastercsv not reading file @ all. how make read installed gem using sudo gem install fastercsv

since uploading file, must specify enctype attribute form multipart/form-data

<form action='/users/bulk_create' method='post' enctype='multipart/form-data'>

secondly cannot pass params[:csv_file] directly fastercsv, need sanity check data , save csv file.

have here, http://www.tutorialspoint.com/ruby-on-rails/rails-file-uploading.htm gives basics of file uploading. suggest looking @ file upload plugin "paperclip" or likes.

then after have saved file, , docs "fastercsv" suggest

#reading #from file #a line @ time  fastercsv.foreach("path/to/file.csv") |row|   # use row here... end

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