Single file rails app to illustrate acceptance only validations

validation_example.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"

  gem "rails"
  gem "pg"
  gem "pry"
end

require "active_record"

ActiveRecord::Base.establish_connection(adapter: "postgresql", database: "validation_example")

ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :name
    t.timestamps
  end
end

class User < ActiveRecord::Base
  validates_acceptance_of :terms_of_service
end

binding.pry

To run this:

createdb validation_example # assuming you have postgres installed and running

ruby validation_example.rb # to get into an interactive pry session