From: Zoltar Speaks <pete.roome@...>
Date: 2007-11-02T23:28:20+09:00
Subject: Re: CSV with Ruby Newbie

Adam Boyle wrote:
> Zoltar Speaks wrote:
>> undefined method `process' for main:Object (NoMethodError)
>>         from /usr/local/lib/ruby/1.8/csv.rb:560:in `each'
>>         from solution.rb:4
> 
> Does the book define a "process" function?  The code below would require 
> you to define a function process that does whatever it is you need to do 
> with the header.
> 
>> reader.each{|row| process(header, row)}
> 
> ex-
> def process( header, row )
>   # do something with header
>   # do something with row
> end
> 
> If process is a method of the CSV module, you'd need to prefix it with 
> CSV:: to get it to work.


Hmmmm no there is no definition of the function 'process' in the book, i 
can't see header as being a CSV module either.

The book starts simply with:

CSV...
Count, Description, Price
12,eggs,2.89,
2,"shirt, blue",21.45,special
1,"""Hello Kitty"" bag",13.99

Ruby...

require 'csv'

CSV.open("csvfile", "r") do |row|
  qty = row[0].to_i
  price = row[2].to_f
  printf "%20s: $%5.2f %s\n", row[1], qty*price, row[3] || " ---"
end

Output...

  Description: $ 0.00  ---
                eggs: $34.68  ---
         shirt, blue: $42.90 special
   "Hello Kitty" bag: $13.99  ---

It then says:
 "Some CSV files have a header line. Read it, and then process the rest 
of the file."

and the Ruby provided is:

require 'csv'
reader = CSV.open("csvfile", "r")
header = reader.shift
reader.each {|row| process(header, row)}



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