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由 David Heinemeier Hansson 提交于
Fixed acts_as_list to trigger remove_from_list on destroy after the fact, not before, so a unique position can be maintained #871 [Alisdair McDiarmid] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@923 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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