class Post < ActiveRecord::Base class CategoryPost < ActiveRecord::Base self.table_name = "categories_posts" belongs_to :category belongs_to :post end module NamedExtension def author 'lifo' end end module NamedExtension2 def greeting "hello" end end scope :containing_the_letter_a, -> { where("body LIKE '%a%'") } scope :ranked_by_comments, -> { order("comments_count DESC") } scope :limit_by, lambda {|l| limit(l) } belongs_to :author belongs_to :author_with_posts, -> { includes(:posts) }, :class_name => "Author", :foreign_key => :author_id belongs_to :author_with_address, -> { includes(:author_address) }, :class_name => "Author", :foreign_key => :author_id def first_comment super.body end has_one :first_comment, -> { order('id ASC') }, :class_name => 'Comment' has_one :last_comment, -> { order('id desc') }, :class_name => 'Comment' scope :with_special_comments, -> { joins(:comments).where(:comments => {:type => 'SpecialComment'}) } scope :with_very_special_comments, -> { joins(:comments).where(:comments => {:type => 'VerySpecialComment'}) } scope :with_post, ->(post_id) { joins(:comments).where(:comments => { :post_id => post_id }) } scope :with_comments, -> { preload(:comments) } scope :with_tags, -> { preload(:taggings) } scope :tagged_with, ->(id) { joins(:taggings).where(taggings: { tag_id: id }) } scope :tagged_with_comment, ->(comment) { joins(:taggings).where(taggings: { comment: comment }) } has_many :comments do def find_most_recent order("id DESC").first end def newest created.last end def the_association proxy_association end end has_many :comments_with_extend, extend: NamedExtension, class_name: "Comment", foreign_key: "post_id" do def greeting "hello" end end has_many :comments_with_extend_2, extend: [NamedExtension, NamedExtension2], class_name: "Comment", foreign_key: "post_id" has_many :author_favorites, :through => :author has_many :author_categorizations, :through => :author, :source => :categorizations has_many :author_addresses, :through => :author has_many :author_address_extra_with_address, through: :author_with_address, source: :author_address_extra has_many :comments_with_interpolated_conditions, ->(p) { where "#{"#{p.aliased_table_name}." rescue ""}body = ?", 'Thank you for the welcome' }, :class_name => 'Comment' has_one :very_special_comment has_one :very_special_comment_with_post, -> { includes(:post) }, :class_name => "VerySpecialComment" has_many :special_comments has_many :nonexistant_comments, -> { where 'comments.id < 0' }, :class_name => 'Comment' has_many :special_comments_ratings, :through => :special_comments, :source => :ratings has_many :special_comments_ratings_taggings, :through => :special_comments_ratings, :source => :taggings has_many :category_posts, :class_name => 'CategoryPost' has_many :scategories, through: :category_posts, source: :category has_and_belongs_to_many :categories has_and_belongs_to_many :special_categories, :join_table => "categories_posts", :association_foreign_key => 'category_id' has_many :taggings, :as => :taggable, :counter_cache => :tags_count has_many :tags, :through => :taggings do def add_joins_and_select select('tags.*, authors.id as author_id') .joins('left outer join posts on taggings.taggable_id = posts.id left outer join authors on posts.author_id = authors.id') .to_a end end has_many :taggings_with_delete_all, :class_name => 'Tagging', :as => :taggable, :dependent => :delete_all has_many :taggings_with_destroy, :class_name => 'Tagging', :as => :taggable, :dependent => :destroy has_many :tags_with_destroy, :through => :taggings, :source => :tag, :dependent => :destroy has_many :tags_with_nullify, :through => :taggings, :source => :tag, :dependent => :nullify has_many :misc_tags, -> { where :tags => { :name => 'Misc' } }, :through => :taggings, :source => :tag has_many :funky_tags, :through => :taggings, :source => :tag has_many :super_tags, :through => :taggings has_many :tags_with_primary_key, :through => :taggings, :source => :tag_with_primary_key has_one :tagging, :as => :taggable has_many :first_taggings, -> { where :taggings => { :comment => 'first' } }, :as => :taggable, :class_name => 'Tagging' has_many :first_blue_tags, -> { where :tags => { :name => 'Blue' } }, :through => :first_taggings, :source => :tag has_many :first_blue_tags_2, -> { where :taggings => { :comment => 'first' } }, :through => :taggings, :source => :blue_tag has_many :invalid_taggings, -> { where 'taggings.id < 0' }, :as => :taggable, :class_name => "Tagging" has_many :invalid_tags, :through => :invalid_taggings, :source => :tag has_many :categorizations, :foreign_key => :category_id has_many :authors, :through => :categorizations has_many :categorizations_using_author_id, :primary_key => :author_id, :foreign_key => :post_id, :class_name => 'Categorization' has_many :authors_using_author_id, :through => :categorizations_using_author_id, :source => :author has_many :taggings_using_author_id, :primary_key => :author_id, :as => :taggable, :class_name => 'Tagging' has_many :tags_using_author_id, :through => :taggings_using_author_id, :source => :tag has_many :standard_categorizations, :class_name => 'Categorization', :foreign_key => :post_id has_many :author_using_custom_pk, :through => :standard_categorizations has_many :authors_using_custom_pk, :through => :standard_categorizations has_many :named_categories, :through => :standard_categorizations has_many :readers has_many :secure_readers has_many :readers_with_person, -> { includes(:person) }, :class_name => "Reader" has_many :people, :through => :readers has_many :single_people, :through => :readers has_many :people_with_callbacks, :source=>:person, :through => :readers, :before_add => lambda {|owner, reader| log(:added, :before, reader.first_name) }, :after_add => lambda {|owner, reader| log(:added, :after, reader.first_name) }, :before_remove => lambda {|owner, reader| log(:removed, :before, reader.first_name) }, :after_remove => lambda {|owner, reader| log(:removed, :after, reader.first_name) } has_many :skimmers, -> { where :skimmer => true }, :class_name => 'Reader' has_many :impatient_people, :through => :skimmers, :source => :person has_many :lazy_readers has_many :lazy_readers_skimmers_or_not, -> { where(skimmer: [ true, false ]) }, :class_name => 'LazyReader' has_many :lazy_people, :through => :lazy_readers, :source => :person has_many :lazy_readers_unscope_skimmers, -> { skimmers_or_not }, :class_name => 'LazyReader' has_many :lazy_people_unscope_skimmers, :through => :lazy_readers_unscope_skimmers, :source => :person def self.top(limit) ranked_by_comments.limit_by(limit) end def self.written_by(author) where(id: author.posts.pluck(:id)) end def self.reset_log @log = [] end def self.log(message=nil, side=nil, new_record=nil) return @log if message.nil? @log << [message, side, new_record] end end class SpecialPost < Post; end class StiPost < Post self.abstract_class = true has_one :special_comment, :class_name => "SpecialComment" end class SubStiPost < StiPost self.table_name = Post.table_name end class FirstPost < ActiveRecord::Base self.table_name = 'posts' default_scope { where(:id => 1) } has_many :comments, :foreign_key => :post_id has_one :comment, :foreign_key => :post_id end class PostWithDefaultInclude < ActiveRecord::Base self.table_name = 'posts' default_scope { includes(:comments) } has_many :comments, :foreign_key => :post_id end class PostWithSpecialCategorization < Post has_many :categorizations, :foreign_key => :post_id default_scope { where(:type => 'PostWithSpecialCategorization').joins(:categorizations).where(:categorizations => { :special => true }) } end class PostWithDefaultScope < ActiveRecord::Base self.table_name = 'posts' default_scope { order(:title) } end class SpecialPostWithDefaultScope < ActiveRecord::Base self.table_name = 'posts' default_scope { where(:id => [1, 5,6]) } end class PostThatLoadsCommentsInAnAfterSaveHook < ActiveRecord::Base self.table_name = 'posts' has_many :comments, class_name: "CommentThatAutomaticallyAltersPostBody", foreign_key: :post_id after_save do |post| post.comments.load end end class PostWithCommentWithDefaultScopeReferencesAssociation < ActiveRecord::Base self.table_name = 'posts' has_many :comment_with_default_scope_references_associations, foreign_key: :post_id has_one :first_comment, class_name: "CommentWithDefaultScopeReferencesAssociation", foreign_key: :post_id end