internetee-registry/app/models/domain.rb

class Domain < ActiveRecord::Base
  belongs_to :registrar
  belongs_to :ns_set
  belongs_to :owner_contact, class_name: 'Contact'
  belongs_to :technical_contact, class_name: 'Contact'
  belongs_to :admin_contact, class_name: 'Contact'

  validates :name, domain_name: true

  class << self
    def check_availability(domains)
      res = []
      domains.each do |x|
        if !DomainNameValidator.validate(x)
          res << {name: x, avail: 0, reason: 'invalid format'}
          next
        end

        if Domain.find_by(name: x)
          res << {name: x, avail: 0, reason: 'in use'} #confirm reason with current API
        else
          res << {name: x, avail: 1}
        end
      end

      res
    end
  end
end