Ensure that has_many :through associations use a count query instead of loading the target when #size is called. Closes #8800 [lifo]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7237 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 6 insertions, 0 deletions

diff --git a/activerecord/test/associations/join_model_test.rb b/activerecord/test/associations/join_model_test.rb
index a24763b92e..d18c878733 100644
--- a/activerecord/test/associations/join_model_test.rb
+++ b/activerecord/test/associations/join_model_test.rb
@@ -451,6 +451,12 @@ class AssociationsJoinModelTest < Test::Unit::TestCase
     assert_nothing_raised { vertices(:vertex_1).sinks << vertices(:vertex_5) }
   end
 
+  def test_has_many_through_collection_size_doesnt_load_target_if_not_loaded
+    author = authors(:david)
+    assert_equal 9, author.comments.size
+    assert !author.comments.loaded?
+  end
+
   def test_adding_junk_to_has_many_through_should_raise_type_mismatch
     assert_raise(ActiveRecord::AssociationTypeMismatch) { posts(:thinking).tags << "Uhh what now?" }
   end