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copied!<p>This is a reasonably full example that assumes the following</p> <ul> <li>Your list of products is contained in a file called veg.txt</li> <li>Your data is arranged across three lines per record with the fields on consecutive lines</li> </ul> <p>I am a bit of a noob to rails so there are undoubtedly better and more elegant ways to do this</p> <pre><code>#!/usr/bin/ruby class Vegetable @@max_name ||= 0 @@max_variety ||= 0 @@max_container ||= 0 attr_reader :name, :variety, :container def initialize(name, variety, container) @name = name @variety = variety @container = container @@max_name = set_max(@name.length, @@max_name) @@max_variety = set_max(@variety.length, @@max_variety) @@max_container = set_max(@container.length, @@max_container) end def set_max(current, max) current > max ? current : max end def self.max_name @@max_name end def self.max_variety @@max_variety end def self.max_container() @@max_container end end products = [] File.open("veg.txt") do | file| while name = file.gets name = name.strip variety = file.gets.to_s.strip container = file.gets.to_s.strip veg = Vegetable.new(name, variety, container) products << veg end end format="%#{Vegetable.max_name}s\t%#{Vegetable.max_variety}s\t%#{Vegetable.max_container}s\n" printf(format, "Name", "Variety", "Container") printf(format, "----", "-------", "---------") products.each do |p| printf(format, p.name, p.variety, p.container) end </code></pre> <p>The following sample file</p> <pre> Artichoke Green Globe, Imperial Star, Violetto 24" deep Beans, Lima Bush Baby, Bush Lima, Fordhook, Fordhook 242 12" wide x 8-10" deep Potatoes King Edward, Desiree, Jersey Royal 36" wide x 8-10" deep </pre> <p>Produced the following output</p> <pre> Name Variety Container ---- ------- --------- Artichoke Green Globe, Imperial Star, Violetto 24" deep Beans, Lima Bush Baby, Bush Lima, Fordhook, Fordhook 242 12" wide x 8-10" deep Potatoes King Edward, Desiree, Jersey Royal 36" wide x 8-10" deep </pre>

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