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由 Rick Olson 提交于
Added descriptive error messages for invalid has_many :through associations: going through :has_one or :has_and_belongs_to_many [Rick] Added support for going through a polymorphic has_many association: (closes #4401) [Rick] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4169 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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