console.rb

main » u = UserExperiment.find_by_email('---')
D, [2014-07-14T19:12:44.447225 #58587] DEBUG -- :   UserExperiment Load (0.4ms)  SELECT  "users".* FROM "users"  WHERE "users"."email" = '---' LIMIT 1
#<UserExperiment:0x000001021c8178> {
                        :id => 490,
                     :login => "imajes",
                     :email => "---",
        :encrypted_password => "...",
      :reset_password_token => "LdSS1bpDFTXyziEn7s_7",
    :reset_password_sent_at => nil,
       :remember_created_at => nil,
             :sign_in_count => 2,
        :current_sign_in_at => Mon, 14 Jul 2014 20:50:48 UTC +00:00,
           :last_sign_in_at => Thu, 10 Jul 2014 19:43:15 UTC +00:00,
        :current_sign_in_ip => "127.0.0.1",
           :last_sign_in_ip => "127.0.0.1",
                :created_at => Tue, 10 Jun 2014 15:13:08 UTC +00:00,
                :updated_at => Mon, 14 Jul 2014 21:22:02 UTC +00:00,
               :facebook_id => nil,
                     :admin => true,
                    :status => "active",
                  :settings => {},
        :confirmation_token => nil,
              :confirmed_at => nil,
      :confirmation_sent_at => nil,
         :unconfirmed_email => nil
}
main » u.settings
{}
main » u.settings["mouse"] = 'cat'
"cat"
main » u.settings
{
    "mouse" => "cat"
}
main » u.settings_changed?
false
main » u.save
D, [2014-07-14T19:13:02.176602 #58587] DEBUG -- :    (0.2ms)  BEGIN
D, [2014-07-14T19:13:02.179569 #58587] DEBUG -- :    (0.1ms)  COMMIT
true

user_experiment.rb

class UserExperiment < ActiveRecord::Base

  store_accessor :settings

  # validates :email_price_alert, inclusion: [true, false]

end