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由 David Heinemeier Hansson 提交于
Removed the default order by id on has_and_belongs_to_many queries as it could kill performance on large sets (you can still specify by hand with :order) git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1162 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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