Rails: Full URL validator

full_url_validator.rb

class FullUrlValidator < ActiveModel::EachValidator
  VALID_SCHEMES = %w(http https)

  def validate_each(record, attribute, value)
    unless valid_full_url?(value)
      record.errors[attribute] << (options[:message] || 'is not a valid URL')
    end
  end


  private

  def valid_full_url?(url)
    url = URI.parse(url)
    url.scheme.in?(VALID_SCHEMES) && url.host

  rescue URI::InvalidURIError
    false
  end
end