You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: conversation.rb
    path of file: ./repos/discourse/lib/reviewable
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class Reviewable < ActiveRecord::Base
  class Conversation
    include ActiveModel::Serialization

    class Post
      includ
    
      def self.excerpt(cooked)
        excerpt = ::Post.excerpt(cooked, 250, keep_emoji_images: true)
        # remove the first link if it's the first node
        fragment = Nokogiri::HTML5.fragment(excerpt)
        if fragment.children.first == fragment.css("a:first").first && fragment.children.first
          fragment.children.first.remove
        end