## mark a section (Learn more)

class Comment < ActiveRecord::Base belongs_to :commentable, :polymorphic => true, :counter_cache => true belongs_to :user has_and_belongs_to_many :related, :join_table => 'related_comments', :foreign_key => 'first_comment_id', :association_foreign_key => 'second_comment_id', :class_name => 'Comment' validates_presence_of :body validates_length_of :body, :maximum => 25000 end

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