associations_cascaded_eager_loading_test.rb

require 'abstract_unit'
require 'active_record/acts/list'
require 'fixtures/post'
require 'fixtures/comment'
require 'fixtures/author'
require 'fixtures/category'
require 'fixtures/categorization'
require 'fixtures/mixin'
require 'fixtures/company'
require 'fixtures/topic'
require 'fixtures/reply'

class CascadedEagerLoadingTest < Test::Unit::TestCase
  fixtures :authors, :mixins, :companies, :posts, :categorizations, :topics

  def test_eager_association_loading_with_cascaded_two_levels
    authors = Author.find(:all, :include=>{:posts=>:comments}, :order=>"authors.id")
    assert_equal 2, authors.size
    assert_equal 5, authors[0].posts.size
    assert_equal 1, authors[1].posts.size
    assert_equal 9, authors[0].posts.collect{|post| post.comments.size }.inject(0){|sum,i| sum+i}
  end

  def test_eager_association_loading_with_cascaded_two_levels_and_one_level
    authors = Author.find(:all, :include=>[{:posts=>:comments}, :categorizations], :order=>"authors.id")
    assert_equal 2, authors.size
    assert_equal 5, authors[0].posts.size
    assert_equal 1, authors[1].posts.size
    assert_equal 9, authors[0].posts.collect{|post| post.comments.size }.inject(0){|sum,i| sum+i}
    assert_equal 1, authors[0].categorizations.size
    assert_equal 1, authors[1].categorizations.size
  end

  def test_eager_association_loading_with_cascaded_two_levels_with_two_has_many_associations
    authors = Author.find(:all, :include=>{:posts=>[:comments, :categorizations]}, :order=>"authors.id")
    assert_equal 2, authors.size
    assert_equal 5, authors[0].posts.size
    assert_equal 1, authors[1].posts.size
    assert_equal 9, authors[0].posts.collect{|post| post.comments.size }.inject(0){|sum,i| sum+i}
  end

  def test_eager_association_loading_with_cascaded_two_levels_and_self_table_reference
    authors = Author.find(:all, :include=>{:posts=>[:comments, :author]}, :order=>"authors.id")
    assert_equal 2, authors.size
    assert_equal 5, authors[0].posts.size
    assert_equal authors(:david).name, authors[0].name
    assert_equal [authors(:david).name], authors[0].posts.collect{|post| post.author.name}.uniq
  end

  def test_eager_association_loading_with_cascaded_two_levels_with_condition
    authors = Author.find(:all, :include=>{:posts=>:comments}, :conditions=>"authors.id=1", :order=>"authors.id")
    assert_equal 1, authors.size
    assert_equal 5, authors[0].posts.size
  end

  def test_eager_association_loading_with_acts_as_tree
    roots = TreeMixin.find(:all, :include=>"children", :conditions=>"mixins.parent_id IS NULL", :order=>"mixins.id")
    assert_equal [mixins(:tree_1), mixins(:tree2_1), mixins(:tree3_1)], roots
    assert_no_queries do
      assert_equal 2, roots[0].children.size
      assert_equal 0, roots[1].children.size
      assert_equal 0, roots[2].children.size
    end
  end

  def test_eager_association_loading_with_cascaded_three_levels_by_ping_pong
    firms = Firm.find(:all, :include=>{:account=>{:firm=>:account}}, :order=>"companies.id")
    assert_equal 2, firms.size
    assert_equal firms.first.account, firms.first.account.firm.account
    assert_equal companies(:first_firm).account, assert_no_queries { firms.first.account.firm.account }
    assert_equal companies(:first_firm).account.firm.account, assert_no_queries { firms.first.account.firm.account }
  end

  def test_eager_association_loading_with_has_many_sti
    topics = Topic.find(:all, :include => :replies, :order => 'topics.id')
    assert_equal [topics(:first), topics(:second)], topics
    assert_no_queries do
      assert_equal 1, topics[0].replies.size
      assert_equal 0, topics[1].replies.size
    end
  end

  def test_eager_association_loading_with_belongs_to_sti
    replies = Reply.find(:all, :include => :topic, :order => 'topics.id')
    assert_equal [topics(:second)], replies
    assert_equal topics(:first), assert_no_queries { replies.first.topic }
  end

  def test_eager_association_loading_with_multiple_stis_and_order
    author = Author.find(:first, :include => { :posts => [ :special_comments , :very_special_comment ] }, :order => 'authors.name, comments.body, very_special_comments_posts.body', :conditions => 'posts.id = 4')
    assert_equal authors(:david), author
    assert_no_queries do
      author.posts.first.special_comments
      author.posts.first.very_special_comment
    end
  end
  
  def test_eager_association_loading_of_stis_with_multiple_references
    authors = Author.find(:all, :include => { :posts => { :special_comments => { :post => [ :special_comments, :very_special_comment ] } } }, :order => 'comments.body, very_special_comments_posts.body', :conditions => 'posts.id = 4')
    assert_equal [authors(:david)], authors
    assert_no_queries do
      authors.first.posts.first.special_comments.first.post.special_comments
      authors.first.posts.first.special_comments.first.post.very_special_comment
    end
  end
end