Ruby on Rails

Hi friends , I am modifying virtualX open source application. I wanted to introduce new functionality that is uploading questions from .csv file and storing those questions to the database. I am very new to ruby this task becomes very tough for me . So i referred so many websites and blogs and i ready some code for this feature . but this is code is not working . I am getting HTTP 500 error . As i checked code in Aptanan Studio , it is showing some errors.

I am posting my code over here . Please help me friends . I am really not getting what is happening .

I am using Ruby  1.8.7
Rails 3.0.3


 
questions_controller.rb

def import
   
   @question = Question.new
   @question.import(params[:file])

    redirect_to root_url, notice: "Questions imported succefully."
  end

questions.rb

def self.import(file)
CSV.foreach(file.path, headers: true) do |row|

question_hash = row.to_hash
@question = Question.where(id: question_hash["id"])

if @question.count == 1
@question.first.update_attributes(question_hash)
else
Question.save!(question_hash)