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  1. PO
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    <p>There are too many changes are there in rails 2.X and 3.0. If you are able to do all configuration, You can..!! We had migrated one of our project recently. But make sure to migrate version wise as Abhilash explained.</p> <p><a href="http://railscasts.com/episodes/225-upgrading-to-rails-3-part-1" rel="nofollow">225-upgrading-to-rails-3-part-1</a></p> <p><a href="http://railscasts.com/episodes/226-upgrading-to-rails-3-part-2" rel="nofollow">226-upgrading-to-rails-3-part-2</a></p> <p><a href="http://railscasts.com/episodes/226-upgrading-to-rails-3-part-2" rel="nofollow">226-upgrading-to-rails-3-part-2</a></p> <p><a href="http://railscasts.com/episodes/415-upgrading-to-rails-4" rel="nofollow">415-upgrading-to-rails-4</a></p> <p>Below are the list of features.!!, you need to take care.</p> <p>(1) Introduction of bundler (New way to manage your gem dependencies)</p> <p>(2) Gemfile and Gemfile.lock (Where all your gem dependencies lies, instead of environment.rb)</p> <p>(3) A new .rb file in config/ folder, named as application.rb (Which has everything that previously environment.rb had) </p> <p>(4) Change in SQL Structure: Model.where(:activated => true) </p> <p>(5) All the mailer script will now be in app/mailers folder, earlier we kept inside app/models.</p> <p>(6) Rails3-UJS support. for links and forms to work as AJAX, instead of writing complex lines of code, we write :remote => true </p> <p>(7) HTML 5 support.</p> <p>(8) Changes in the model based validation syntax: validates :name, :presence => true </p> <p>(9) Ability to install windows/ruby/jruby/development/production specific gems to Gemfile. </p> <pre><code>group :production do gem 'will_paginate' end </code></pre> <p>All the Best.!</p>
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    1. PORuby on Rails migration from Ruby 1.8.7 Rails 2.3.15 to Ruby 2 and Rails 4
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    1. USPravin Mishra
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    1. COPravin Mishra, You are asking me to migrate to rails 2.X to 3 then to rails 4, then what is the case for Ruby migration from 1.8.7 to 2?
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      1. USPaul
    2. COYou need to take care of few Syntax and new methods that's has beed added and updated, Look to these below ruby release note: https://www.ruby-lang.org/en/news/2010/08/18/ruby-1-9.2-released/ https://www.ruby-lang.org/en/news/2013/02/24/ruby-2-0-0-p0-is-released/ https://www.ruby-lang.org/en/news/2012/04/20/ruby-1-9-3-p194-is-released/
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      1. USPravin Mishra
    3. COThe same question is asked here http://www.reddit.com/r/ruby/comments/1q8p42/goin_nuclear_upgrading_from_rubyrails_1872315_to/
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