gistfile1.rb

  #import.rb (model)
  def initialize(options)
    #attributes.each { |name, value| send("#{name}=", value) }
    
    @file = options[:file]
  end
  
  def save
    if file.present?
      cleanup_before_save
  
      @to_process = CSV.parse(file.tempfile, row_sep: "\n", headers: true)
      process_files!
    else
      errors.add :csv_file, "can't be blank"
    end
  rescue ArgumentError, CSV::MalformedCSVError => e
    errors.add :csv_file, "is not valid"
  end
  
  def process_files!
    @to_process.each do |row|
      if Venue.exists?(Venue.find_by_factual_id(row['factual_id']))
        venue = update_venue_from_csv(row)
        if venue.changed?
          venue.save!
          @updated_venues << venue
        else
          @existing_venues += 1
        end
      else
        venue = create_venue_from_csv(row)
        if venue.new_record?
        @unsaved_venues << venue
      else
        @saved_venues << venue
      end
    end