import.rb

class Import < ActiveRecord::Base
  belongs_to :user
  validates_presence_of :user
  validate :data_must_be_valid_file, :data_must_be_csv
  
  def data_must_be_valid_file
    limit = 100
    errors.add(:data, 'must be a file') unless data.class == Tempfile
    errors.add(:data, 'must not be less than ' + limit.to_s + ' Kb') unless data.size < limit * 1024
  end
  
  def data_must_be_csv
    begin
      FasterCSV.parse(data.read)
    rescue Exception => e
      errors.add(:data, "must be a valid CSV file: #{e}")
    end
  end
  
  before_save :read_file
  
  protected
    def read_file
      logger.debug(data) # => <File>
      #data = data.read (Error! Can't evaluate nil.read)
      logger.debug(self.data) # => <File>
      self.data = self.data.read # => Nothin'
    end
end