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由 David Heinemeier Hansson 提交于
Fixed that Active Record would call SHOW FIELDS twice (or more) for the same model when the cached results were available #1947 [sd@notso.net] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2153 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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