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 belongs_to :special_post_with_default_scope, foreign_key: :post_id has_many :children, class_name: "Comment", foreign_key: :parent_id belongs_to :parent, class_name: "Comment", counter_cache: :children_count class ::OopsError < RuntimeError; end module OopsExtension def destroy_all(*) raise OopsError end end default_scope { extending OopsExtension } scope :oops_comments, -> { extending OopsExtension } # Should not be called if extending modules that having the method exists on an association. def self.greeting raise end 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 class CommentWithDefaultScopeReferencesAssociation < Comment default_scope -> { includes(:developer).order("developers.name").references(:developer) } belongs_to :developer end