dl.rb:37:in `block in deserialized_users': undefined method `<<' for nil:NilClass (NoMethodError) from /Users/lewis/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/csv.rb:1717:in `each' from /Users/lewis/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/csv.rb:1120:in `block in foreach' from /Users/lewis/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/csv.rb:126…

gistfile1.rb

require 'csv'
require 'YAML'

class Customers

  attr_reader :cust_id, :elect_or_gas, :disconnect_doc, :move_in_date, :move_out_date, :bill_year, :bill_month, :span_days, :meter_read_date, :meter_read_type, :consumption, :exception_code
  
  def initialize cust_id, elect_or_gas, disconnect_doc, move_in_date, move_out_date, bill_year, bill_month, span_days, meter_read_date, meter_read_type, consumption, exception_code
    @cust_id = cust_id
    @elect_or_gas = elect_or_gas
    @disconnect_doc = disconnect_doc 
    @move_in_date = move_in_date
    @move_out_date = move_out_date
    @bill_year = bill_year
    @bill_month = bill_month
    @span_days = span_days
    @meter_read_date = meter_read_date
    @meter_read_type = meter_read_type
    @consumption = consumption
    @exception_code = exception_code
  end
end

class Parse
  attr_accessor :customers 

  def initialize filename
    customers = [] 
    deserialized_users filename
  end

  def deserialized_users filename
    CSV.foreach(filename, col_sep: "|")  do |row|
      next if row.empty?
      cust_id, elect_or_gas, disconnect_doc, move_in_date, move_out_date, bill_year, bill_month, span_days, meter_read_date, meter_read_type, consumption, exception_code = row
      #sanitized_values(cust_id, elect_or_gas, disconnect_doc, move_in_date, move_out_date, bill_year, bill_month, span_days, meter_read_date, meter_read_type, consumption, exception_code = row)
      customers << Customers.new(cust_id, elect_or_gas, disconnect_doc, move_in_date, move_out_date, bill_year, bill_month, span_days, meter_read_date, meter_read_type, consumption, exception_code)
    end
    customers
  end

  def serialized_users
    File.open("./serialized_users.yaml", "w") do |yaml_file|
      customers.each do |c|
        yaml_file.puts YAML::dump([c.cust_id, c.elect_or_gas, c.disconnect_doc, c.move_in_date, c.move_out_date, c.bill_year, c.bill_month, c.span_days, c.meter_read_date, c.meter_read_type, c.consumption, c.exception_code])
      end
    end
  end


end

p = Parse.new "./pulse_data.txt"
#p.serialized_users