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由 David Heinemeier Hansson 提交于
Renamed Errors#count to Errors#size but kept an alias for the old name (and included an alias for length too) (closes #3920, #3320) [contact@lukeredpath.co.uk] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3639 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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