Fix has_many :through to add the appropriate conditions when going through an association using STI. Closes #5783. [Jonathan Viney]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5305 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/test/associations/eager_test.rb

@@ -104,7 +104,7 @@ class EagerAssociationTest < Test::Unit::TestCase
   end
   
   def test_eager_with_has_many_through
-    posts_with_comments = people(:michael).posts.find(:all, :include => :comments )
+    posts_with_comments = people(:michael).posts.find(:all, :include => :comments)
     posts_with_author = people(:michael).posts.find(:all, :include => :author )
     posts_with_comments_and_author = people(:michael).posts.find(:all, :include => [ :comments, :author ])
     assert_equal 2, posts_with_comments.inject(0) { |sum, post| sum += post.comments.size }
@@ -112,6 +112,21 @@ class EagerAssociationTest < Test::Unit::TestCase
     assert_equal authors(:david), assert_no_queries { posts_with_comments_and_author.first.author }
   end
 
+  def test_eager_with_has_many_through_an_sti_join_model
+    author = Author.find(:first, :include => :special_post_comments, :order => 'authors.id')
+    assert_equal [comments(:does_it_hurt)], assert_no_queries { author.special_post_comments }
+  end
+  
+  def test_eager_with_has_many_through_an_sti_join_model_with_conditions_on_both
+    author = Author.find(:first, :include => :special_nonexistant_post_comments, :order => 'authors.id')
+    assert_equal [], author.special_nonexistant_post_comments
+  end
+  
+  def test_eager_with_has_many_through_join_model_with_conditions
+    assert_equal Author.find(:first, :include => :hello_post_comments).hello_post_comments,
+      Author.find(:first).hello_post_comments
+  end
+
   def test_eager_with_has_many_and_limit
     posts = Post.find(:all, :order => 'posts.id asc', :include => [ :author, :comments ], :limit => 2)
     assert_equal 2, posts.size

activerecord/test/associations/join_model_test.rb

@@ -463,6 +463,10 @@ class AssociationsJoinModelTest < Test::Unit::TestCase
     assert_nothing_raised { authors(:david).comments.sum(:post_id) }
   end
 
+  def test_has_many_through_has_many_with_sti
+    assert_equal [comments(:does_it_hurt)], authors(:david).special_post_comments
+  end
+
   private
     # create dynamic Post models to allow different dependency options
     def find_post_with_dependency(post_id, association, association_name, dependency)

activerecord/test/fixtures/author.rb

@@ -17,7 +17,15 @@ class Author < ActiveRecord::Base
   has_many :comments, :through => :posts
   has_many :funky_comments, :through => :posts, :source => :comments
 
-  has_many :special_posts,        :class_name => "Post"
+  has_many :special_posts
+  has_many :special_post_comments, :through => :special_posts, :source => :comments
+  
+  has_many :special_nonexistant_posts, :class_name => "SpecialPost", :conditions => "posts.body = 'nonexistant'"
+  has_many :special_nonexistant_post_comments, :through => :special_nonexistant_posts, :source => :comments, :conditions => "comments.post_id = 0"
+
+  has_many :hello_posts, :class_name => "Post", :conditions => "posts.body = 'hello'"
+  has_many :hello_post_comments, :through => :hello_posts, :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,