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由 Marcel Molina 提交于
Add warning about the proper way to validate the presence of a foreign key. Closes #4147. [Francois Beausoleil <francois.beausoleil@gmail.com>] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4285 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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