Upgrading Rails Redux - Speaker Deck

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Upgrading Rails Redux

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Who has a Rails app in production?

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Rails 1.x

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Rails 2.x

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Rails 3.x

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Porting to Rails 4 Sometimes the new code still works in old version of Rails.    scope :sorted, order(“updated_at")    scope :sorted, -> { order("updated_at") }

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Porting to Rails 4 Otherwise branch?

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Dual-boot Rails # Gemfile def rails4?  ENV["RAILS4"] == '1'  end RAILS4=1 rails s

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# Gemfile    if rails4?  gem "rails", “4.0.5" # protected_attributes, etc.  else  gem "rails", "3.2.18"  end Dual-boot Rails

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  # config/environments/test.rb    ActiveSupport::Deprecation.silenced = true if rails4?  Dual-boot Rails

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RailsDiff

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Incremental progress • Boot Server • Run Tests (Rails 3 & 4) • Passing Tests • QA • Switch Default Rails

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whoops • Non-digest images in emails, use public/ • Blocks iframe embedding  response.headers.except! ‘X-Frame-Options' • Endpoints  protect_from_forgery exceptions (CSRF)  xml_data = Hash.from_xml(request.body.read) • Threading bug in activerecord-session_store

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if rails_master?  # gem "rails", :github => "rails/rails", :branch => "4-2-stable"  gem "rails", "5.0.0.beta1"  else  gem "rails", "4.2.5"  end

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Resources • https://github.com/discourse/discourse/ blob/master/Gemﬁle • http://railsdiff.org/ • https://speakerdeck.com/nathany/ upgrading-rails-redux