# File lib/etherpad-lite/models/pad.rb, line 166
    def chat_messages(start_index=nil, end_index=nil)
      messages = @instance.client.getChatHistory(:padID => @id, :start => start_index, :end => end_index)[:messages]
      messages.map do |msg|
        attrs = {padID: @id}.merge(msg)
        ChatMessage.new(@instance, attrs)
      end
    end