From: "Paul D. Kraus" <paul.kraus@...>
Date: 2006-06-06T05:00:31+09:00
Subject: Object Troubles - undefined method `+'

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I am parsing a text file that is 3 fields per line deliminted by pipes '|'
Each line contains a customer code, shipmethod, and customer name.
Each line represents an invoice that was cut.

I need to count all invoices and then count all invoices that went out next
day air saver.
From working with the pick axe it seems to me that you have a class with two
attributes invoice, and nda invoice.
You then store your objects in a hash for easy lookup.

When i run the below program I get this error...
./parse.rb:14:in `incndainvoice': undefined method `+' for nil:NilClass
(NoMethodError)
        from ./parse.rb:31
        from ./parse.rb:20

TIA,
Paul

Here is my class and program ...

#!/usr/bin/env ruby

class Customer
    attr_reader :invoices, :ndainvoices
    attr_writer :invoices, :ndainvoices
    def initialize
        @invoices = 1
        @ndainvoices = 0
    end
    def increment_invoice
        invoices = invoices + 1
    end
    def increment_ndainvoice
        ndainvoice = ndainvoice + 1
    end
end

customers = Hash.new

open('NdaInvoiceCount.txt','r').each_line do |line|
        (customer_code, ship_method, customer_name) = line.chomp.split('|')
        if customers[ customer_code ]
            customers[ customer_code ].increment_invoice
        else
            customers[ customer_code ] = Customer.new
        end
        customers[ customer_code ].increment_ndainvoice if ship_method ==
'SAVGRD'
end


here is some sample data....
0000016324|SAVGRD|Dupage Prosthetics
0000038955|SAVGRD|TRUDELL ORTH & PROS SERVICES
0000019155|UPS   |Scott Orthotic Labs
0000061674|UPS   |COMPREHENSIVE BRACE & LIMB CTR LLC
0000008593|U02G  |Huron Valley Assoc
0000039954|SAVGRD|Island Coast Orthopedics
0000028719|UPS   |Paul Richelson's Feet First
0000003455|FEDGND|CLARK ORTH
0000019297|UPS   |J. Slawner LTD.
0000061508|UPS   |LEVY & RAPPEL

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