testSanitizer.rb

#!/usr/bin/ruby
require 'active_record'

ActiveRecord::Base.establish_connection(
  adapter: 'postgresql',
  database: 'pgservice_development',
  username: 'webuser',
  password: 'qwer',
  host:     'localhost',
  port:       5432
)

class User < ActiveRecord::Base
end

param = ARGV[0]
sanitizedParam = ActiveRecord::Base::sanitize(ARGV[0])
sanitizedQuery = "Sanitized Query: select * from login where userid=#{sanitizedParam}"
query = "Normal query: select * from login where userid='#{param}'"

puts sanitizedQuery
puts query


#Sample usage: ruby testSanitizer.rb "' or 1=1--"
# => The above query returns first row of the table if not sanitized. By using ActiveRecord::Base.sanitize, this problem is prevented.