Rails 3 – how do I avoid database altogether?

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Rails 3:

In application.rb, remove the require 'rails/all' line and instead add these lines:

require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "rails/test_unit/railtie"
require "sprockets/railtie"

Also see Remove ActiveRecord in Rails 3
and look into the Active Model railscast

Rails 3.2.x:

You’ll also need to remove/comment out this line in application.rb

config.active_record.whitelist_attributes = true

And remove/comment these two lines from development.rb

config.active_record.mass_assignment_sanitizer = :strict
config.active_record.auto_explain_threshold_in_seconds = 0.5

Rails 2.x:

In config/environment.rb add (or uncomment) the line

config.frameworks -= [ :active_record, :active_resource, :action_mailer ]

This will cause Rails not to use those frameworks. (Note the nearly-invisible -= !)

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