Uploading CSV files into Rails 3 Database

gistfile1.rb

Model
uploader.rb

#The csv I am using were created from some code manipulation hence not well formatted, I am stripping off new lines and merging fields in some cases
class Uploader
  def self.csv_loader(model)
    File.open("#{Rails.root}/data/#{model}.csv", 'r').each do |row| 
      new_row = row.split(",")
      case
      when model == 'Brand'
        eval(model).create!(:name => row.gsub("\n", '')) 
      when model == 'Serie'
        eval(model).create!(:brand_name => new_row[0], :name => new_row[1].gsub("\n", ''))
      when model == 'Ink'
        eval(model).create!(:brand_name => new_row[0], :serie_name => new_row[1], :printer_name => new_row[2], :name => new_row[3..(new_row.size - 1)].join(",").gsub("\n", ''))
      when model == 'Inkname'
        eval(model).create!(:brand_name => new_row[0], :name => new_row[1].gsub("\n", ''))
      when model == 'Printer'
        eval(model).create!(:brand_name => new_row[0], :serie_name => new_row[1], :name => new_row[2..(new_row.size - 1)].join(",").gsub("\n", ''))
      end
    end
  end

end

Application Controller
#The assumption here is a one-to-one mapping between controllers and models
application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  protected
  def db_check
    model = self.class.to_s.gsub("Controller", '').singularize
    Uploader.csv_loader(model) if eval(model).all.empty?
  end
end

Sample controller
class InksController < ApplicationController
  before_filter :db_check
end