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由 Rick Olson 提交于
Raise error when trying to select many polymorphic objects with has_many :through or :include (closes #4226) [josh@hasmanythrough.com] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3961 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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