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由 David Heinemeier Hansson 提交于
Added ActiveRecord::Base#becomes to turn a record into one of another class (mostly relevant for STIs) [DHH] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8259 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
e6f54290
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