Upgrading from Rails 2.1.x to Rails 2.3.11

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If your application is currently on any version of Rails 2.1.x,
Then following changes needs to be done for upgrading your application to Rails 2.3.11

1. First install Rails version 2.3.11

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>gem install rails -v2.3.11</div></div></pre></div>

2. Freeze app ruby gems

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>rake rails:freeze:gems</div></div></pre></div>

Hopefully it should work for you but it gave me following error
> undefined method `manage_gems’ for Gem:Module

3. Create sample rails 2.3.11 app

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>rails 2.3.11 testsapp</div></div></pre></div>

Now, Copy all missing “config/initializers/*” files from newly created “testapp” to the application that is to be upgraded.

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>cp testapp/config/initializers/* config/initializers</div></div></pre></div>

4. Change Rails version inside environment.rb to Rails 2.3.11

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'># Specifies gem version of Rails to use when vendor/rails is not present </div></div><div data-line='2' class='code-highlight-row numbered'><div class='code-highlight-line'>RAILS_GEM_VERSION = '2.3.11'</div></div></pre></div>

5. Rename app/controllers/application.rb file to app/controllers/application_controller.rb

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>rails:update:application_controller</div></div></pre></div>

6. Start rails server and fix the issues one by one

<div class='code-highlight'><pre class='code-highlight-pre'><div data-line='1' class='code-highlight-row numbered'><div class='code-highlight-line'>ruby script/server</div></div></pre></div>

Upgrading from Rails 2.1.x to Rails 2.3.11

Written by

Sandip Ransing

Supported by

Fun On Rails

Journal of a Web Developer #ruby #rails #JS