Rails seeds.rb with data in CSV

seeds.rb

# https://gist.github.com/arjunvenkat/1115bc41bf395a162084
# https://github.com/peimelo/saudecontrolada/blob/master/db/seeds.rb

require 'csv'

def rescue_error(e, error_num, row, line_num)
  p '-------------------------'
  p "[error #{error_num}:line #{line_num}]: #{ e } | #{ row.to_hash }"
  error_num += 1
end

def load_file(klass)
  error_num = 1
  line_num = 2
  csv_text = File.read(Rails.root.join('db', 'data', "#{klass}.csv"))
  csv = CSV.parse(csv_text, headers: true)
  p "loading #{klass} ..."
  csv.each do |row|
    begin
      register = klass.find_by_id(row['id'])
      if register
        register.update_attributes!(row.to_hash)
      else
        klass.create!(row.to_hash)
      end
    rescue => e
      error_num = rescue_error(e, error_num, row, line_num)
    end
    line_num += 1
  end
  p "... done #{klass}"
end

load_file(Reference)
load_file(Unit)
load_file(Exam)
load_file(Valor)
load_file(Food)

if User.count
  User.where(gender: 'Feminino').update_all(gender: 'F')
  User.where(gender: 'Masculino').update_all(gender: 'M')
end

if Valor.count
  Valor.where(gender: 'Feminino').update_all(gender: 'F')
  Valor.where(gender: 'Masculino').update_all(gender: 'M')
end

Unit.csv