Question

I have created a Rails 3 project with mentioned option. Can I somehow “revert” this option and have active record back as in default, or must I create a new project?

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EDIT

Ok, to have ActiveRecord support back I had to:

1. Delete separate require calls in application.rb and replace it with require 'rails/all' (or just uncomment # require "active_record/railtie")
2. Uncomment # gem 'sqlite3-ruby', :require => 'sqlite3' line in Gemfile (for sqlite)
3. Create database.yml file and fill it with options
4. invoke rake db:create task

After that it seems that I can continue to work with AR as usual.

Answer 1

Make a new project with ActiveRecord, and then pairwise diff config/application.rb and config/environments/*.rb to determine if there are any default settings you should add back to your project.