# File lib/dnsruby/resource/NXT.rb, line 33
  def from_hash(params_hash)
    unless REQUIRED_KEYS.all? { |key| params_hash[key] }
      raise ArgumentError.new("NXT hash must contain all of: #{REQUIRED_KEYS.join(', ')}.")
    end
    @next_domain = Name.create(params_hash[:next_domain]) unless @next_domain.is_a?(Name)
    @types       = params_hash[:types]
  end