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由 David Heinemeier Hansson 提交于
Added that has_and_belongs_to_many associations with additional attributes also can be created between unsaved objects and only committed to the database when Base#save is called on the associator #524 [Eric Anderson] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@484 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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