has_many_through_associations_test.rb

require "cases/helper"
require 'models/post'
require 'models/person'
require 'models/reference'
require 'models/job'
require 'models/reader'
require 'models/comment'
require 'models/tag'
require 'models/tagging'
require 'models/author'
require 'models/owner'
require 'models/pet'
require 'models/toy'
require 'models/contract'
require 'models/company'
require 'models/developer'
require 'models/subscriber'
require 'models/book'
require 'models/subscription'
require 'models/essay'
require 'models/category'
require 'models/owner'
require 'models/categorization'
require 'models/member'
require 'models/membership'
require 'models/club'

class HasManyThroughAssociationsTest < ActiveRecord::TestCase
  fixtures :posts, :readers, :people, :comments, :authors, :categories, :taggings, :tags,
           :owners, :pets, :toys, :jobs, :references, :companies, :members, :author_addresses,
           :subscribers, :books, :subscriptions, :developers, :categorizations, :essays

  # Dummies to force column loads so query counts are clean.
  def setup
    Person.create :first_name => 'gummy'
    Reader.create :person_id => 0, :post_id => 0
  end

  def test_include?
    person = Person.new
    post = Post.new
    person.posts << post
    assert person.posts.include?(post)
  end

  def test_associate_existing
    posts(:thinking); people(:david) # Warm cache

    assert_queries(1) do
      posts(:thinking).people << people(:david)
    end

    assert_queries(1) do
      assert posts(:thinking).people.include?(people(:david))
    end

    assert posts(:thinking).reload.people(true).include?(people(:david))
  end

  def test_associate_existing_record_twice_should_add_to_target_twice
    post   = posts(:thinking)
    person = people(:david)

    assert_difference 'post.people.to_a.count', 2 do
      post.people << person
      post.people << person
    end
  end

  def test_associate_existing_record_twice_should_add_records_twice
    post   = posts(:thinking)
    person = people(:david)

    assert_difference 'post.people.count', 2 do
      post.people << person
      post.people << person
    end
  end

  def test_add_two_instance_and_then_deleting
    post   = posts(:thinking)
    person = people(:david)

    post.people << person
    post.people << person

    counts = ['post.people.count', 'post.people.to_a.count', 'post.readers.count', 'post.readers.to_a.count']
    assert_difference counts, -2 do
      post.people.delete(person)
    end

    assert !post.people.reload.include?(person)
  end

  def test_associating_new
    assert_queries(1) { posts(:thinking) }
    new_person = nil # so block binding catches it

    assert_queries(0) do
      new_person = Person.new :first_name => 'bob'
    end

    # Associating new records always saves them
    # Thus, 1 query for the new person record, 1 query for the new join table record
    assert_queries(2) do
      posts(:thinking).people << new_person
    end

    assert_queries(1) do
      assert posts(:thinking).people.include?(new_person)
    end

    assert posts(:thinking).reload.people(true).include?(new_person)
  end

  def test_associate_new_by_building
    assert_queries(1) { posts(:thinking) }

    assert_queries(0) do
      posts(:thinking).people.build(:first_name => "Bob")
      posts(:thinking).people.new(:first_name => "Ted")
    end

    # Should only need to load the association once
    assert_queries(1) do
      assert posts(:thinking).people.collect(&:first_name).include?("Bob")
      assert posts(:thinking).people.collect(&:first_name).include?("Ted")
    end

    # 2 queries for each new record (1 to save the record itself, 1 for the join model)
    #    * 2 new records = 4
    # + 1 query to save the actual post = 5
    assert_queries(5) do
      posts(:thinking).body += '-changed'
      posts(:thinking).save
    end

    assert posts(:thinking).reload.people(true).collect(&:first_name).include?("Bob")
    assert posts(:thinking).reload.people(true).collect(&:first_name).include?("Ted")
  end

  def test_build_then_save_with_has_many_inverse
    post   = posts(:thinking)
    person = post.people.build(:first_name => "Bob")
    person.save
    post.reload

    assert post.people.include?(person)
  end

  def test_build_then_save_with_has_one_inverse
    post   = posts(:thinking)
    person = post.single_people.build(:first_name => "Bob")
    person.save
    post.reload

    assert post.single_people.include?(person)
  end

  def test_delete_association
    assert_queries(2){posts(:welcome);people(:michael); }

    assert_queries(1) do
      posts(:welcome).people.delete(people(:michael))
    end

    assert_queries(1) do
      assert posts(:welcome).people.empty?
    end

    assert posts(:welcome).reload.people(true).empty?
  end

  def test_destroy_association
    assert_no_difference "Person.count" do
      assert_difference "Reader.count", -1 do
        posts(:welcome).people.destroy(people(:michael))
      end
    end

    assert posts(:welcome).reload.people.empty?
    assert posts(:welcome).people(true).empty?
  end

  def test_destroy_all
    assert_no_difference "Person.count" do
      assert_difference "Reader.count", -1 do
        posts(:welcome).people.destroy_all
      end
    end

    assert posts(:welcome).reload.people.empty?
    assert posts(:welcome).people(true).empty?
  end

  def test_should_raise_exception_for_destroying_mismatching_records
    assert_no_difference ["Person.count", "Reader.count"] do
      assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:welcome).people.destroy(posts(:thinking)) }
    end
  end

  def test_delete_through_belongs_to_with_dependent_nullify
    Reference.make_comments = true

    person    = people(:michael)
    job       = jobs(:magician)
    reference = Reference.where(:job_id => job.id, :person_id => person.id).first

    assert_no_difference ['Job.count', 'Reference.count'] do
      assert_difference 'person.jobs.count', -1 do
        person.jobs_with_dependent_nullify.delete(job)
      end
    end

    assert_equal nil, reference.reload.job_id
  ensure
    Reference.make_comments = false
  end

  def test_delete_through_belongs_to_with_dependent_delete_all
    Reference.make_comments = true

    person = people(:michael)
    job    = jobs(:magician)

    # Make sure we're not deleting everything
    assert person.jobs.count >= 2

    assert_no_difference 'Job.count' do
      assert_difference ['person.jobs.count', 'Reference.count'], -1 do
        person.jobs_with_dependent_delete_all.delete(job)
      end
    end

    # Check that the destroy callback on Reference did not run
    assert_equal nil, person.reload.comments
  ensure
    Reference.make_comments = false
  end

  def test_delete_through_belongs_to_with_dependent_destroy
    Reference.make_comments = true

    person = people(:michael)
    job    = jobs(:magician)

    # Make sure we're not deleting everything
    assert person.jobs.count >= 2

    assert_no_difference 'Job.count' do
      assert_difference ['person.jobs.count', 'Reference.count'], -1 do
        person.jobs_with_dependent_destroy.delete(job)
      end
    end

    # Check that the destroy callback on Reference ran
    assert_equal "Reference destroyed", person.reload.comments
  ensure
    Reference.make_comments = false
  end

  def test_belongs_to_with_dependent_destroy
    person = PersonWithDependentDestroyJobs.find(1)

    # Create a reference which is not linked to a job. This should not be destroyed.
    person.references.create!

    assert_no_difference 'Job.count' do
      assert_difference 'Reference.count', -person.jobs.count do
        person.destroy
      end
    end
  end

  def test_belongs_to_with_dependent_delete_all
    person = PersonWithDependentDeleteAllJobs.find(1)

    # Create a reference which is not linked to a job. This should not be destroyed.
    person.references.create!

    assert_no_difference 'Job.count' do
      assert_difference 'Reference.count', -person.jobs.count do
        person.destroy
      end
    end
  end

  def test_belongs_to_with_dependent_nullify
    person = PersonWithDependentNullifyJobs.find(1)

    references = person.references.to_a

    assert_no_difference ['Reference.count', 'Job.count'] do
      person.destroy
    end

    references.each do |reference|
      assert_equal nil, reference.reload.job_id
    end
  end

  def test_update_counter_caches_on_delete
    post = posts(:welcome)
    tag  = post.tags.create!(:name => 'doomed')

    assert_difference ['post.reload.taggings_count', 'post.reload.tags_count'], -1 do
      posts(:welcome).tags.delete(tag)
    end
  end

  def test_update_counter_caches_on_delete_with_dependent_destroy
    post = posts(:welcome)
    tag  = post.tags.create!(:name => 'doomed')
    post.update_column(:tags_with_destroy_count, post.tags.count)

    assert_difference ['post.reload.taggings_count', 'post.reload.tags_with_destroy_count'], -1 do
      posts(:welcome).tags_with_destroy.delete(tag)
    end
  end

  def test_update_counter_caches_on_delete_with_dependent_nullify
    post = posts(:welcome)
    tag  = post.tags.create!(:name => 'doomed')
    post.update_column(:tags_with_nullify_count, post.tags.count)

    assert_no_difference 'post.reload.taggings_count' do
      assert_difference 'post.reload.tags_with_nullify_count', -1 do
        posts(:welcome).tags_with_nullify.delete(tag)
      end
    end
  end

  def test_replace_association
    assert_queries(4){posts(:welcome);people(:david);people(:michael); posts(:welcome).people(true)}

    # 1 query to delete the existing reader (michael)
    # 1 query to associate the new reader (david)
    assert_queries(2) do
      posts(:welcome).people = [people(:david)]
    end

    assert_queries(0){
      assert posts(:welcome).people.include?(people(:david))
      assert !posts(:welcome).people.include?(people(:michael))
    }

    assert posts(:welcome).reload.people(true).include?(people(:david))
    assert !posts(:welcome).reload.people(true).include?(people(:michael))
  end

  def test_replace_order_is_preserved
    posts(:welcome).people.clear
    posts(:welcome).people = [people(:david), people(:michael)]
    assert_equal [people(:david).id, people(:michael).id], posts(:welcome).readers.order('id').map(&:person_id)

    # Test the inverse order in case the first success was a coincidence
    posts(:welcome).people.clear
    posts(:welcome).people = [people(:michael), people(:david)]
    assert_equal [people(:michael).id, people(:david).id], posts(:welcome).readers.order('id').map(&:person_id)
  end

  def test_replace_by_id_order_is_preserved
    posts(:welcome).people.clear
    posts(:welcome).person_ids = [people(:david).id, people(:michael).id]
    assert_equal [people(:david).id, people(:michael).id], posts(:welcome).readers.order('id').map(&:person_id)

    # Test the inverse order in case the first success was a coincidence
    posts(:welcome).people.clear
    posts(:welcome).person_ids = [people(:michael).id, people(:david).id]
    assert_equal [people(:michael).id, people(:david).id], posts(:welcome).readers.order('id').map(&:person_id)
  end

  def test_associate_with_create
    assert_queries(1) { posts(:thinking) }

    # 1 query for the new record, 1 for the join table record
    # No need to update the actual collection yet!
    assert_queries(2) do
      posts(:thinking).people.create(:first_name=>"Jeb")
    end

    # *Now* we actually need the collection so it's loaded
    assert_queries(1) do
      assert posts(:thinking).people.collect(&:first_name).include?("Jeb")
    end

    assert posts(:thinking).reload.people(true).collect(&:first_name).include?("Jeb")
  end

  def test_associate_with_create_and_no_options
    peeps = posts(:thinking).people.count
    posts(:thinking).people.create(:first_name => 'foo')
    assert_equal peeps + 1, posts(:thinking).people.count
  end

  def test_associate_with_create_with_through_having_conditions
    impatient_people = posts(:thinking).impatient_people.count
    posts(:thinking).impatient_people.create!(:first_name => 'foo')
    assert_equal impatient_people + 1, posts(:thinking).impatient_people.count
  end

  def test_associate_with_create_exclamation_and_no_options
    peeps = posts(:thinking).people.count
    posts(:thinking).people.create!(:first_name => 'foo')
    assert_equal peeps + 1, posts(:thinking).people.count
  end

  def test_create_on_new_record
    p = Post.new

    assert_raises(ActiveRecord::RecordNotSaved) { p.people.create(:first_name => "mew") }
    assert_raises(ActiveRecord::RecordNotSaved) { p.people.create!(:first_name => "snow") }
  end

  def test_associate_with_create_and_invalid_options
    firm = companies(:first_firm)
    assert_no_difference('firm.developers.count') { assert_nothing_raised { firm.developers.create(:name => '0') } }
  end

  def test_associate_with_create_and_valid_options
    firm = companies(:first_firm)
    assert_difference('firm.developers.count', 1) { firm.developers.create(:name => 'developer') }
  end

  def test_associate_with_create_bang_and_invalid_options
    firm = companies(:first_firm)
    assert_no_difference('firm.developers.count') { assert_raises(ActiveRecord::RecordInvalid) { firm.developers.create!(:name => '0') } }
  end

  def test_associate_with_create_bang_and_valid_options
    firm = companies(:first_firm)
    assert_difference('firm.developers.count', 1) { firm.developers.create!(:name => 'developer') }
  end

  def test_push_with_invalid_record
    firm = companies(:first_firm)
    assert_raises(ActiveRecord::RecordInvalid) { firm.developers << Developer.new(:name => '0') }
  end

  def test_push_with_invalid_join_record
    repair_validations(Contract) do
      Contract.validate {|r| r.errors[:base] << 'Invalid Contract' }

      firm = companies(:first_firm)
      lifo = Developer.new(:name => 'lifo')
      assert_raises(ActiveRecord::RecordInvalid) { firm.developers << lifo }

      lifo = Developer.create!(:name => 'lifo')
      assert_raises(ActiveRecord::RecordInvalid) { firm.developers << lifo }
    end
  end

  def test_clear_associations
    assert_queries(2) { posts(:welcome);posts(:welcome).people(true) }

    assert_queries(1) do
      posts(:welcome).people.clear
    end

    assert_queries(0) do
      assert posts(:welcome).people.empty?
    end

    assert posts(:welcome).reload.people(true).empty?
  end

  def test_association_callback_ordering
    Post.reset_log
    log = Post.log
    post = posts(:thinking)

    post.people_with_callbacks << people(:michael)
    assert_equal [
      [:added, :before, "Michael"],
      [:added, :after, "Michael"]
    ], log.last(2)

    post.people_with_callbacks.push(people(:david), Person.create!(:first_name => "Bob"), Person.new(:first_name => "Lary"))
    assert_equal [
      [:added, :before, "David"],
      [:added, :after, "David"],
      [:added, :before, "Bob"],
      [:added, :after, "Bob"],
      [:added, :before, "Lary"],
      [:added, :after, "Lary"]
    ],log.last(6)

    post.people_with_callbacks.build(:first_name => "Ted")
    assert_equal [
      [:added, :before, "Ted"],
      [:added, :after, "Ted"]
    ], log.last(2)

    post.people_with_callbacks.create(:first_name => "Sam")
    assert_equal [
      [:added, :before, "Sam"],
      [:added, :after, "Sam"]
    ], log.last(2)

    post.people_with_callbacks = [people(:michael),people(:david), Person.new(:first_name => "Julian"), Person.create!(:first_name => "Roger")]
    assert_equal((%w(Ted Bob Sam Lary) * 2).sort, log[-12..-5].collect(&:last).sort)
    assert_equal [
      [:added, :before, "Julian"],
      [:added, :after, "Julian"],
      [:added, :before, "Roger"],
      [:added, :after, "Roger"]
    ], log.last(4)

    post.people_with_callbacks.clear
    assert_equal((%w(Michael David Julian Roger) * 2).sort, log.last(8).collect(&:last).sort)
  end

  def test_dynamic_find_should_respect_association_include
    # SQL error in sort clause if :include is not included
    # due to Unknown column 'comments.id'
    assert Person.find(1).posts_with_comments_sorted_by_comment_id.find_by_title('Welcome to the weblog')
  end

  def test_count_with_include_should_alias_join_table
    assert_equal 2, people(:michael).posts.count(:include => :readers)
  end

  def test_inner_join_with_quoted_table_name
    assert_equal 2, people(:michael).jobs.size
  end

  def test_get_ids
    assert_equal [posts(:welcome).id, posts(:authorless).id].sort, people(:michael).post_ids.sort
  end

  def test_get_ids_for_has_many_through_with_conditions_should_not_preload
    Tagging.create!(:taggable_type => 'Post', :taggable_id => posts(:welcome).id, :tag => tags(:misc))
    ActiveRecord::Associations::Preloader.expects(:new).never
    posts(:welcome).misc_tag_ids
  end

  def test_get_ids_for_loaded_associations
    person = people(:michael)
    person.posts(true)
    assert_queries(0) do
      person.post_ids
      person.post_ids
    end
  end

  def test_get_ids_for_unloaded_associations_does_not_load_them
    person = people(:michael)
    assert !person.posts.loaded?
    assert_equal [posts(:welcome).id, posts(:authorless).id].sort, person.post_ids.sort
    assert !person.posts.loaded?
  end

  def test_association_proxy_transaction_method_starts_transaction_in_association_class
    Tag.expects(:transaction)
    Post.find(:first).tags.transaction do
      # nothing
    end
  end

  def test_has_many_association_through_a_belongs_to_association_where_the_association_doesnt_exist
    post = Post.create!(:title => "TITLE", :body => "BODY")
    assert_equal [], post.author_favorites
  end

  def test_has_many_association_through_a_belongs_to_association
    author = authors(:mary)
    post = Post.create!(:author => author, :title => "TITLE", :body => "BODY")
    author.author_favorites.create(:favorite_author_id => 1)
    author.author_favorites.create(:favorite_author_id => 2)
    author.author_favorites.create(:favorite_author_id => 3)
    assert_equal post.author.author_favorites, post.author_favorites
  end

  def test_has_many_association_through_a_has_many_association_with_nonstandard_primary_keys
    assert_equal 1, owners(:blackbeard).toys.count
  end

  def test_find_on_has_many_association_collection_with_include_and_conditions
    post_with_no_comments = people(:michael).posts_with_no_comments.first
    assert_equal post_with_no_comments, posts(:authorless)
  end

  def test_has_many_through_has_one_reflection
    assert_equal [comments(:eager_sti_on_associations_vs_comment)], authors(:david).very_special_comments
  end

  def test_modifying_has_many_through_has_one_reflection_should_raise
    [
      lambda { authors(:david).very_special_comments = [VerySpecialComment.create!(:body => "Gorp!", :post_id => 1011), VerySpecialComment.create!(:body => "Eep!", :post_id => 1012)] },
      lambda { authors(:david).very_special_comments << VerySpecialComment.create!(:body => "Hoohah!", :post_id => 1013) },
      lambda { authors(:david).very_special_comments.delete(authors(:david).very_special_comments.first) },
    ].each {|block| assert_raise(ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection, &block) }
  end

  def test_has_many_association_through_a_has_many_association_to_self
    sarah = Person.create!(:first_name => 'Sarah', :primary_contact_id => people(:susan).id, :gender => 'F', :number1_fan_id => 1)
    john = Person.create!(:first_name => 'John', :primary_contact_id => sarah.id, :gender => 'M', :number1_fan_id => 1)
    assert_equal sarah.agents, [john]
    assert_equal people(:susan).agents.map(&:agents).flatten, people(:susan).agents_of_agents
  end

  def test_associate_existing_with_nonstandard_primary_key_on_belongs_to
    Categorization.create(:author => authors(:mary), :named_category_name => categories(:general).name)
    assert_equal categories(:general), authors(:mary).named_categories.first
  end

  def test_collection_build_with_nonstandard_primary_key_on_belongs_to
    author   = authors(:mary)
    category = author.named_categories.build(:name => "Primary")
    author.save
    assert Categorization.exists?(:author_id => author.id, :named_category_name => category.name)
    assert author.named_categories(true).include?(category)
  end

  def test_collection_create_with_nonstandard_primary_key_on_belongs_to
    author   = authors(:mary)
    category = author.named_categories.create(:name => "Primary")
    assert Categorization.exists?(:author_id => author.id, :named_category_name => category.name)
    assert author.named_categories(true).include?(category)
  end

  def test_collection_delete_with_nonstandard_primary_key_on_belongs_to
    author   = authors(:mary)
    category = author.named_categories.create(:name => "Primary")
    author.named_categories.delete(category)
    assert !Categorization.exists?(:author_id => author.id, :named_category_name => category.name)
    assert author.named_categories(true).empty?
  end

  def test_collection_singular_ids_getter_with_string_primary_keys
    book = books(:awdr)
    assert_equal 2, book.subscriber_ids.size
    assert_equal [subscribers(:first).nick, subscribers(:second).nick].sort, book.subscriber_ids.sort
  end

  def test_collection_singular_ids_setter
    company = companies(:rails_core)
    dev = Developer.find(:first)

    company.developer_ids = [dev.id]
    assert_equal [dev], company.developers
  end

  def test_collection_singular_ids_setter_with_string_primary_keys
    assert_nothing_raised do
      book = books(:awdr)
      book.subscriber_ids = [subscribers(:second).nick]
      assert_equal [subscribers(:second)], book.subscribers(true)

      book.subscriber_ids = []
      assert_equal [], book.subscribers(true)
    end

  end

  def test_collection_singular_ids_setter_raises_exception_when_invalid_ids_set
    company = companies(:rails_core)
    ids =  [Developer.find(:first).id, -9999]
    assert_raises(ActiveRecord::RecordNotFound) {company.developer_ids= ids}
  end

  def test_build_a_model_from_hm_through_association_with_where_clause
    assert_nothing_raised { books(:awdr).subscribers.where(:nick => "marklazz").build }
  end

  def test_attributes_are_being_set_when_initialized_from_hm_through_association_with_where_clause
    new_subscriber = books(:awdr).subscribers.where(:nick => "marklazz").build
    assert_equal new_subscriber.nick, "marklazz"
  end

  def test_attributes_are_being_set_when_initialized_from_hm_through_association_with_multiple_where_clauses
    new_subscriber = books(:awdr).subscribers.where(:nick => "marklazz").where(:name => 'Marcelo Giorgi').build
    assert_equal new_subscriber.nick, "marklazz"
    assert_equal new_subscriber.name, "Marcelo Giorgi"
  end

  def test_include_method_in_association_through_should_return_true_for_instance_added_with_build
    person = Person.new
    reference = person.references.build
    job = reference.build_job
    assert person.jobs.include?(job)
  end

  def test_include_method_in_association_through_should_return_true_for_instance_added_with_nested_builds
    author = Author.new
    post = author.posts.build
    comment = post.comments.build
    assert author.comments.include?(comment)
  end

  def test_has_many_through_polymorphic_with_primary_key_option
    assert_equal [categories(:general)], authors(:david).essay_categories

    authors = Author.joins(:essay_categories).where('categories.id' => categories(:general).id)
    assert_equal authors(:david), authors.first

    assert_equal [owners(:blackbeard)], authors(:david).essay_owners

    authors = Author.joins(:essay_owners).where("owners.name = 'blackbeard'")
    assert_equal authors(:david), authors.first
  end

  def test_has_many_through_with_primary_key_option
    assert_equal [categories(:general)], authors(:david).essay_categories_2

    authors = Author.joins(:essay_categories_2).where('categories.id' => categories(:general).id)
    assert_equal authors(:david), authors.first
  end

  def test_size_of_through_association_should_increase_correctly_when_has_many_association_is_added
    post = posts(:thinking)
    readers = post.readers.size
    post.people << people(:michael)
    assert_equal readers + 1, post.readers.size
  end

  def test_has_many_through_with_default_scope_on_join_model
    assert_equal posts(:welcome).comments.order('id').all, authors(:david).comments_on_first_posts
  end

  def test_create_has_many_through_with_default_scope_on_join_model
    category = authors(:david).special_categories.create(:name => "Foo")
    assert_equal 1, category.categorizations.where(:special => true).count
  end

  def test_joining_has_many_through_with_uniq
    mary = Author.joins(:unique_categorized_posts).where(:id => authors(:mary).id).first
    assert_equal 1, mary.unique_categorized_posts.length
    assert_equal 1, mary.unique_categorized_post_ids.length
  end

  def test_joining_has_many_through_belongs_to
    posts = Post.joins(:author_categorizations).order('posts.id').
                 where('categorizations.id' => categorizations(:mary_thinking_sti).id)

    assert_equal [posts(:eager_other), posts(:misc_by_mary), posts(:other_by_mary)], posts
  end

  def test_select_chosen_fields_only
    author = authors(:david)
    assert_equal ['body'], author.comments.select('comments.body').first.attributes.keys
  end

  def test_get_has_many_through_belongs_to_ids_with_conditions
    assert_equal [categories(:general).id], authors(:mary).categories_like_general_ids
  end

  def test_get_collection_singular_ids_on_has_many_through_with_conditions_and_include
    person = Person.first
    assert_equal person.posts_with_no_comment_ids, person.posts_with_no_comments.map(&:id)
  end

  def test_count_has_many_through_with_named_scope
    assert_equal 2, authors(:mary).categories.count
    assert_equal 1, authors(:mary).categories.general.count
  end

  def test_has_many_through_belongs_to_should_update_when_the_through_foreign_key_changes
    post = posts(:eager_other)

    post.author_categorizations
    proxy = post.send(:association_instance_get, :author_categorizations)

    assert !proxy.stale_target?
    assert_equal authors(:mary).categorizations.sort_by(&:id), post.author_categorizations.sort_by(&:id)

    post.author_id = authors(:david).id

    assert proxy.stale_target?
    assert_equal authors(:david).categorizations.sort_by(&:id), post.author_categorizations.sort_by(&:id)
  end

  def test_create_with_conditions_hash_on_through_association
    member = members(:groucho)
    club   = member.clubs.create!

    assert_equal true, club.reload.membership.favourite
  end

  def test_deleting_from_has_many_through_a_belongs_to_should_not_try_to_update_counter
    post    = posts(:welcome)
    address = author_addresses(:david_address)

    assert post.author_addresses.include?(address)
    post.author_addresses.delete(address)
    assert post[:author_count].nil?
  end

  def test_interpolated_conditions
    post = posts(:welcome)
    assert !post.tags.empty?
    assert_equal post.tags, post.interpolated_tags
    assert_equal post.tags, post.interpolated_tags_2
  end

  def test_primary_key_option_on_source
    post     = posts(:welcome)
    category = categories(:general)
    Categorization.create!(:post_id => post.id, :named_category_name => category.name)

    assert_equal [category], post.named_categories
    assert_equal [category.name], post.named_category_ids # checks when target loaded
    assert_equal [category.name], post.reload.named_category_ids # checks when target no loaded
  end

  def test_create_should_not_raise_exception_when_join_record_has_errors
    repair_validations(Categorization) do
      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
      Category.create(:name => 'Fishing', :authors => [Author.first])
    end
  end

  def test_save_should_not_raise_exception_when_join_record_has_errors
    repair_validations(Categorization) do
      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
      c = Category.create(:name => 'Fishing', :authors => [Author.first])
      c.save
    end
  end

  def test_create_bang_should_raise_exception_when_join_record_has_errors
    repair_validations(Categorization) do
      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
      assert_raises(ActiveRecord::RecordInvalid) do
        Category.create!(:name => 'Fishing', :authors => [Author.first])
      end
    end
  end

  def test_save_bang_should_raise_exception_when_join_record_has_errors
    repair_validations(Categorization) do
      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
      c = Category.new(:name => 'Fishing', :authors => [Author.first])
      assert_raises(ActiveRecord::RecordInvalid) do
        c.save!
      end
    end
  end

  def test_create_bang_returns_falsy_when_join_record_has_errors
    repair_validations(Categorization) do
      Categorization.validate { |r| r.errors[:base] << 'Invalid Categorization' }
      c = Category.new(:name => 'Fishing', :authors => [Author.first])
      assert !c.save
    end
  end

  def test_preloading_empty_through_association_via_joins
    person = Person.create!(:first_name => "Gaga")
    person = Person.where(:id => person.id).where('readers.id = 1 or 1=1').includes(:posts).to_a.first

    assert person.posts.loaded?, 'person.posts should be loaded'
    assert_equal [], person.posts
  end

  def test_explicitly_joining_join_table
    assert_equal owners(:blackbeard).toys, owners(:blackbeard).toys.with_pet
  end

  def test_has_many_through_with_polymorphic_source
    post = tags(:general).tagged_posts.create! :title => "foo", :body => "bar"
    assert_equal [tags(:general)], post.reload.tags
  end
end