fixes #5490 - ambiguous column in taxonomix pluck on Rails 3.2.8
(cherry picked from commit 3089c85f005425e8fec07c560ce5fb65ca25d45d)
fixes #5490 - ambiguous column in taxonomix pluck on Rails 3.2.8
(cherry picked from commit 3089c85f005425e8fec07c560ce5fb65ca25d45d)