delete_all doesn't work when chained with joins

Akira's patch fixes the issue for me, but the attached test fails because Pet.joins(:toys).where(:toys => {:name => 'Bone'}).count returns 0.

Also, I'm not a great fan of the formatting:

def test_delete_all_with_joins
  assert (count = Pet.joins(:toys).where(:toys => {:name => 'Bone'}).count) > 0

  assert_equal count, Pet.joins(:toys).where(:toys => {:name => 'Bone'}).delete_all
end

It would probably be more readable (and understandable) like this:

def test_delete_all_with_joins
  pets = Pet.joins(:toys).where(:toys => {:name => 'Bone'})
  count = pets.count
  
  assert count > 0
  assert_equal count, pets.delete_all
end

Akira, could you check out if the test fails for you too? What do you think about my code formatting suggestion? Please note I haven't tested the last code snippet, it's just to show how I'd like it to look :)