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由 Rick Olson 提交于
Ensure that has_many :through associations use a count query instead of loading the target when #size is called. Closes #8800 [lifo] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7237 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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