rails--rails/activerecord/test/models/author.rb

class Author < ActiveRecord::Base
  has_many :posts
  has_many :serialized_posts
  has_one :post
  has_many :very_special_comments, through: :posts
  has_many :posts_with_comments, -> { includes(:comments) }, class_name: "Post"
  has_many :popular_grouped_posts, -> { includes(:comments).group("type").having("SUM(comments_count) > 1").select("type") }, class_name: "Post"
  has_many :posts_with_comments_sorted_by_comment_id, -> { includes(:comments).order("comments.id") }, class_name: "Post"
  has_many :posts_sorted_by_id_limited, -> { order("posts.id").limit(1) }, class_name: "Post"
  has_many :posts_with_categories, -> { includes(:categories) }, class_name: "Post"
  has_many :posts_with_comments_and_categories, -> { includes(:comments, :categories).order("posts.id") }, class_name: "Post"
  has_many :posts_with_special_categorizations, class_name: "PostWithSpecialCategorization"
  has_one  :post_about_thinking, -> { where("posts.title like '%thinking%'") }, class_name: "Post"
  has_one  :post_about_thinking_with_last_comment, -> { where("posts.title like '%thinking%'").includes(:last_comment) }, class_name: "Post"
  has_many :comments, through: :posts do
    def ratings
      Rating.joins(:comment).merge(self)
    end
  end
  has_many :comments_containing_the_letter_e, through: :posts, source: :comments
  has_many :comments_with_order_and_conditions, -> { order("comments.body").where("comments.body like 'Thank%'") }, through: :posts, source: :comments
  has_many :comments_with_include, -> { includes(:post) }, through: :posts, source: :comments

  has_many :first_posts
  has_many :comments_on_first_posts, -> { order("posts.id desc, comments.id asc") }, through: :first_posts, source: :comments

  has_one :first_post
  has_one :comment_on_first_post, -> { order("posts.id desc, comments.id asc") }, through: :first_post, source: :comments

  has_many :thinking_posts, -> { where(title: "So I was thinking") }, dependent: :delete_all, class_name: "Post"
  has_many :welcome_posts, -> { where(title: "Welcome to the weblog") }, class_name: "Post"

  has_many :welcome_posts_with_one_comment,
           -> { where(title: "Welcome to the weblog").where("comments_count = ?", 1) },
           class_name: "Post"
  has_many :welcome_posts_with_comments,
           -> { where(title: "Welcome to the weblog").where(Post.arel_table[:comments_count].gt(0)) },
           class_name: "Post"

  has_many :comments_desc, -> { order("comments.id DESC") }, through: :posts, source: :comments
  has_many :funky_comments, through: :posts, source: :comments
  has_many :ordered_uniq_comments, -> { distinct.order("comments.id") }, through: :posts, source: :comments
  has_many :ordered_uniq_comments_desc, -> { distinct.order("comments.id DESC") }, through: :posts, source: :comments
  has_many :readonly_comments, -> { readonly }, through: :posts, source: :comments

  has_many :special_posts
  has_many :special_post_comments, through: :special_posts, source: :comments
  has_many :special_posts_with_default_scope, class_name: "SpecialPostWithDefaultScope"

  has_many :sti_posts, class_name: "StiPost"
  has_many :sti_post_comments, through: :sti_posts, source: :comments

  has_many :special_nonexistent_posts, -> { where("posts.body = 'nonexistent'") }, class_name: "SpecialPost"
  has_many :special_nonexistent_post_comments, -> { where("comments.post_id" => 0) }, through: :special_nonexistent_posts, source: :comments
  has_many :nonexistent_comments, through: :posts

  has_many :hello_posts, -> { where "posts.body = 'hello'" }, class_name: "Post"
  has_many :hello_post_comments, through: :hello_posts, source: :comments
  has_many :posts_with_no_comments, -> { where("comments.id" => nil).includes(:comments) }, class_name: "Post"

  has_many :hello_posts_with_hash_conditions, -> { where(body: "hello") }, class_name: "Post"
  has_many :hello_post_comments_with_hash_conditions, through: :hello_posts_with_hash_conditions, source: :comments

  has_many :other_posts,          class_name: "Post"
  has_many :posts_with_callbacks, class_name: "Post", before_add: :log_before_adding,
           after_add: :log_after_adding,
           before_remove: :log_before_removing,
           after_remove: :log_after_removing
  has_many :posts_with_proc_callbacks, class_name: "Post",
           before_add: Proc.new { |o, r| o.post_log << "before_adding#{r.id || '<new>'}" },
           after_add: Proc.new { |o, r| o.post_log << "after_adding#{r.id || '<new>'}" },
           before_remove: Proc.new { |o, r| o.post_log << "before_removing#{r.id}" },
           after_remove: Proc.new { |o, r| o.post_log << "after_removing#{r.id}" }
  has_many :posts_with_multiple_callbacks, class_name: "Post",
           before_add: [:log_before_adding, Proc.new { |o, r| o.post_log << "before_adding_proc#{r.id || '<new>'}" }],
           after_add: [:log_after_adding,  Proc.new { |o, r| o.post_log << "after_adding_proc#{r.id || '<new>'}" }]
  has_many :unchangeable_posts, class_name: "Post", before_add: :raise_exception, after_add: :log_after_adding

  has_many :categorizations
  has_many :categories, through: :categorizations
  has_many :named_categories, through: :categorizations

  has_many :special_categorizations
  has_many :special_categories, through: :special_categorizations, source: :category
  has_one  :special_category,   through: :special_categorizations, source: :category

  has_many :categories_like_general, -> { where(name: "General") }, through: :categorizations, source: :category, class_name: "Category"

  has_many :categorized_posts, through: :categorizations, source: :post
  has_many :unique_categorized_posts, -> { distinct }, through: :categorizations, source: :post

  has_many :nothings, through: :kateggorisatons, class_name: "Category"

  has_many :author_favorites
  has_many :favorite_authors, -> { order("name") }, through: :author_favorites

  has_many :taggings,        through: :posts, source: :taggings
  has_many :taggings_2,      through: :posts, source: :tagging
  has_many :tags,            through: :posts
  has_many :post_categories, through: :posts, source: :categories
  has_many :tagging_tags,    through: :taggings, source: :tag

  has_many :similar_posts, -> { distinct }, through: :tags, source: :tagged_posts
  has_many :distinct_tags, -> { select("DISTINCT tags.*").order("tags.name") }, through: :posts, source: :tags

  has_many :tags_with_primary_key, through: :posts

  has_many :books
  has_many :subscriptions,        through: :books
  has_many :subscribers, -> { order("subscribers.nick") }, through: :subscriptions
  has_many :distinct_subscribers, -> { select("DISTINCT subscribers.*").order("subscribers.nick") }, through: :subscriptions, source: :subscriber

  has_one :essay, primary_key: :name, as: :writer
  has_one :essay_category, through: :essay, source: :category
  has_one :essay_owner, through: :essay, source: :owner

  has_one :essay_2, primary_key: :name, class_name: "Essay", foreign_key: :author_id
  has_one :essay_category_2, through: :essay_2, source: :category

  has_many :essays, primary_key: :name, as: :writer
  has_many :essay_categories, through: :essays, source: :category
  has_many :essay_owners, through: :essays, source: :owner

  has_many :essays_2, primary_key: :name, class_name: "Essay", foreign_key: :author_id
  has_many :essay_categories_2, through: :essays_2, source: :category

  belongs_to :owned_essay, primary_key: :name, class_name: "Essay"
  has_one :owned_essay_category, through: :owned_essay, source: :category

  belongs_to :author_address,       dependent: :destroy
  belongs_to :author_address_extra, dependent: :delete, class_name: "AuthorAddress"

  has_many :category_post_comments, through: :categories, source: :post_comments

  has_many :misc_posts, -> { where(posts: { title: ["misc post by bob", "misc post by mary"] }) }, class_name: "Post"
  has_many :misc_post_first_blue_tags, through: :misc_posts, source: :first_blue_tags

  has_many :misc_post_first_blue_tags_2, -> { where(posts: { title: ["misc post by bob", "misc post by mary"] }) },
           through: :posts, source: :first_blue_tags_2

  has_many :posts_with_default_include, class_name: "PostWithDefaultInclude"
  has_many :comments_on_posts_with_default_include, through: :posts_with_default_include, source: :comments

  has_many :posts_with_signature, ->(record) { where("posts.title LIKE ?", "%by #{record.name.downcase}%") }, class_name: "Post"

  has_many :posts_with_extension, -> { order(:title) }, class_name: "Post" do
    def extension_method; end
  end

  has_many :posts_with_extension_and_instance, ->(record) { order(:title) }, class_name: "Post" do
    def extension_method; end
  end

  attr_accessor :post_log
  after_initialize :set_post_log

  def set_post_log
    @post_log = []
  end

  def label
    "#{id}-#{name}"
  end

  def social
    %w(twitter github)
  end

  validates_presence_of :name

  private
    def log_before_adding(object)
      @post_log << "before_adding#{object.id || '<new>'}"
    end

    def log_after_adding(object)
      @post_log << "after_adding#{object.id}"
    end

    def log_before_removing(object)
      @post_log << "before_removing#{object.id}"
    end

    def log_after_removing(object)
      @post_log << "after_removing#{object.id}"
    end

    def raise_exception(object)
      raise Exception.new("You can't add a post")
    end
end

class AuthorAddress < ActiveRecord::Base
  has_one :author

  def self.destroyed_author_address_ids
    @destroyed_author_address_ids ||= []
  end

  before_destroy do |author_address|
    AuthorAddress.destroyed_author_address_ids << author_address.id
  end
end

class AuthorFavorite < ActiveRecord::Base
  belongs_to :author
  belongs_to :favorite_author, class_name: "Author"
end