class Comment < ActiveRecord::Base scope :limit_by, lambda {|l| limit(l) } scope :containing_the_letter_e, -> { where("comments.body LIKE '%e%'") } scope :not_again, -> { where("comments.body NOT LIKE '%again%'") } scope :for_first_post, -> { where(:post_id => 1) } scope :for_first_author, -> { joins(:post).where("posts.author_id" => 1) } scope :created, -> { all } belongs_to :post, :counter_cache => true belongs_to :author, polymorphic: true belongs_to :resource, polymorphic: true has_many :ratings belongs_to :first_post, :foreign_key => :post_id has_many :children, :class_name => 'Comment', :foreign_key => :parent_id belongs_to :parent, :class_name => 'Comment', :counter_cache => :children_count def self.what_are_you 'a comment...' end def self.search_by_type(q) where("#{QUOTED_TYPE} = ?", q) end def self.all_as_method all end scope :all_as_scope, -> { all } def to_s body end end class SpecialComment < Comment end class SubSpecialComment < SpecialComment end class VerySpecialComment < Comment end class CommentThatAutomaticallyAltersPostBody < Comment belongs_to :post, class_name: "PostThatLoadsCommentsInAnAfterSaveHook", foreign_key: :post_id after_save do |comment| comment.post.update_attributes(body: "Automatically altered") end end